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SUZUKI Toyoko
Graduate School of Engineering / Department of Chemical Science and Engineering
Assistant Professor

Researcher basic information

■ Research Keyword
  • Polymer colloid science
■ Research Areas
  • Nanotechnology/Materials / Polymer chemistry

Research activity information

■ Award
  • Aug. 2016 日本ゾルーゲル学会, ベストポスター賞
    鈴木 登代子

  • Feb. 2016 Japan Society of Colour Material, 2015 Most Accessed Review Award of Japan Society of Colour Material (2016), Preparation of Composite Particles Utilizing Hydrogen Bonding Interaction
    MINAMI HIDETO, CHANG Cheng, SUZUKI Toyoko
    一般社団法人・色材協会が発行している『色材協会誌』の中で、2015年に最もダウンロードが多かった総説論文に対して授与される
    Official journal

  • Jun. 2007 日本接着学会, 進歩賞, 機器分析を用いた高分子微粒子のキャラクタリゼーションに関する研究
    TOYOKO SUZUKI

  • Jul. 2005 高分子学会関西支部, エクセレントポスター賞, 若手発表者
    OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi

■ Paper
  • Hyota Nishi, Shintaro Ishidate, Reina Nakamoto, Shinya Katsube, Nozomu Suzuki, Toyoko Suzuki, Hideto Minami
    Abstract Micrometer-sized, monodispersed silicone hollow particles are functional materials with properties attributed to both their hollow structure and the silicone composition. However, there are few reports on their preparation. We have successfully prepared these particles by combining an original suspension polymerization technique, the self-assembling phase-separated polymer method, with a molecular diffusion method. The resulting particles exhibit heat resistance owing to the silicone matrix and maintain their hollow structure even after heating to 900 °C.
    Oxford University Press (OUP), Dec. 2024, Chemistry Letters, 54(1) (1)
    Scientific journal

  • Hyota Nishi, Shintaro Ishidate, Ryuta Amasaki, Reina Nakamoto, Shinya Katsube, Nozomu Suzuki, Toyoko Suzuki, Hideto Minami
    Abstract Single hollow particles are used in various fields, particularly in thermal insulation materials, owing to their low thermal conductivity attributed to encapsulated air properties. “The self‐assembling phase separated polymer (SaPSeP) method” is an original hollowing method that is proposed by this laboratory 25 years ago. Most hollow particles prepared by the SaPSeP method have carbon, oxygen, and hydrogen polymer shells, which lack sufficient heat resistance. In this study, hollow particles with a silicone shell, which is highly heat‐resistant, are prepared using the SaPSeP method using a trimer of 3‐methacryloxypropylmethyldimethoxysilane (MPDS). The MPDS trimer (3MPDS) is synthesized through the sol–gel reaction of MPDS with a basic aqueous solution. Additionally, hollow particles are prepared using a new silicone oligomer composed of MPDS and dimethoxymethylvinylsilane (DMVS). Both hollow particles prepared from 3MPDS and from a new silicone oligomer composed of MPDS and DMVS showed high heat resistance. They maintained their hollow structure even when exposed to temperatures up to 900 °C.
    Wiley, Dec. 2024, Macromolecular Reaction Engineering
    Scientific journal

  • Takahiro Morishita, Ikuko Maitani, Takeru Michiura, Nozomu Suzuki, Toyoko Suzuki, Kensuke Akamatsu, Hideto Minami
    American Chemical Society (ACS), Nov. 2024, ACS Applied Materials & Interfaces, 16(46) (46), 64058 - 64064
    Scientific journal

  • Nao Minoshima, Takeru Michiura, Takuto Ouchi, Shinya Matsuno, Nozomu Suzuki, Toyoko Suzuki, Hideto Minami
    Abstract Hollow polyimide (PI) particles were successfully prepared using chemical imidization with acetic anhydride and pyridine as the chemical imidization reagents. The imidization reagents were added to the dispersion in which N,N-dimethylformamide (DMF) droplets with dissolved poly(amic acid) (PAmA, the precursor of PI) were dispersed in a cyclohexane medium. In the absence of poly(n-butyl methacrylate) (P[n-BMA]) in PAmA/DMF droplets, approximately 10% of the PI particles had hollow structures. Conversely, in the presence of a small amount of P(n-BMA) in PAmA/DMF droplets (0.2∼1 wt%), all PI particles had hollow structures. The P(n-BMA) would affect the phase separation of the PI in the droplets, thereby promoting the formation of a hollow structure.
    Oxford University Press (OUP), Dec. 2023, Chemistry Letters, 53(2) (2)
    Scientific journal

  • Mohammad Kawsar Hossain, Mostafa Kaiyum Sharafat, Hideto Minami, Toyoko Suzuki, Mohammad Ashraful Alam, Mohammad Mahabur Rahman, Hasan Ahmad
    Springer Science and Business Media LLC, Feb. 2023, Journal of Polymer Research, 30(3) (3)
    Scientific journal

  • Chujuan Huang, Toyoko Suzuki, Hideto Minami
    Iodine transfer polymerization was used to synthesize micrometer-sized block copolymer particles using methyl methacrylate (MMA) and vinyl acetate (VAc) in a microsuspension system. Three morphologies were obtained after hydrolysis, depending on the block ratio.
    Royal Society of Chemistry (RSC), 2023, Polymer Chemistry, 14(26) (26), 3126 - 3135
    Scientific journal

  • Ryohei Morimoto, Toyoko Suzuki, Hideto Minami
    The morphologies of polypropylene (PP)/polystyrene (PS) composite particles obtained using different type of the initiator in the seeded emulsion polymerization of styrene with multi-hollow PP seed particles.
    Royal Society of Chemistry (RSC), 2023, Polymer Chemistry, 14(3) (3), 352 - 358
    Scientific journal

  • Ryohei Morimoto, Toyoko Suzuki, Hideto Minami
    American Chemical Society (ACS), Aug. 2022, ACS Applied Polymer Materials, 4(8) (8), 5619 - 5625
    Scientific journal

  • Mohammad Zakaria Sarker, Mohammad Mahbubor Rahman, Hideto Minami, Toyoko Suzuki, Mohammad Abdur Rahman, Alam Khan, Sheikh Manjura Hoque, Hasan Ahmad
    Elsevier BV, Aug. 2022, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 647, 129044 - 129044
    Scientific journal

  • Katsuhiro Onita, Miku Onishi, Taro Omura, Takeshi Wakiya, Toyoko Suzuki, Hideto Minami
    American Chemical Society (ACS), Jun. 2022, Langmuir, 38(23) (23), 7341 - 7345
    Scientific journal

  • Musashi Seike, Makoto Uda, Toyoko Suzuki, Hideto Minami, Shinya Higashimoto, Tomoyasu Hirai, Yoshinobu Nakamura, Syuji Fujii
    American Chemical Society (ACS), Apr. 2022, ACS Omega, 7(15) (15), 13010 - 13021
    Scientific journal

  • Ken Mukai, Yuki Fujii, Toyoko Suzuki, Hideto Minami
    Springer Science and Business Media LLC, Apr. 2022, Colloid and Polymer Science, 300(4) (4), 365 - 373
    Scientific journal

  • Mohammad Zakaria Sarker, Mohammad Mahbubor Rahman, Hideto Minami, Toyoko Suzuki, Hasan Ahmad
    Springer Science and Business Media LLC, Apr. 2022, Colloid and Polymer Science, 300(4) (4), 279 - 296
    Scientific journal

  • Chujuan Huang, Toyoko Suzuki, Hideto Minami
    Schematic of the behaviors of iodine species in the microsuspension polymerization of vinyl acetate (VAc) in an aqueous medium.
    Royal Society of Chemistry (RSC), 2022, Polymer Chemistry, 13(5) (5), 640 - 648
    Scientific journal

  • Atsunori Mori, Sonoka Yamamoto, Yushin Shibuya, Toyoko Suzuki, Kentaro Okano, Masaki Horie
    AbstractEffect of divalent metals was studied in the cross-coupling polymerization of thiophenes leading to head-to-tail-type poly-3-hexyl­thiophene. Deprotonation of the C–H bond at the 5-position of 2-halo-3-hexylthiophene by LDA followed by metal exchange was carried out in one pot and following addition of nickel catalyst underwent polymerization. One-shot reaction involving deprotonation/transmetalation/ cross coupling polymerization was also examined with manganese(II) chloride and nickel(II) catalyst.
    Georg Thieme Verlag KG, Sep. 2021, Synthesis, 53(17) (17), 3081 - 3084
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Ryohei Morimoto, Toyoko Suzuki, Hideto Minami
    American Chemical Society (ACS), Aug. 2021, Langmuir, 37(34) (34), 10388 - 10393
    Scientific journal

  • Taro Omura, Toyoko Suzuki, Hideto Minami
    American Chemical Society (ACS), Aug. 2021, Langmuir, 37(31) (31), 9371 - 9377
    Scientific journal

  • Taro Omura, Yuki Fujii, Toyoko Suzuki, Hideto Minami
    Wiley, May 2021, Journal of Applied Polymer Science, 138(19) (19), 50397 - 50397
    Scientific journal

  • Mohammad Zakaria Sarker, Mohammad Mahbubor Rahman, Hideto Minami, Toyoko Suzuki, Mohammad Kawsar Hossain, Hasan Ahmad
    Elsevier BV, May 2021, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 617, 126403 - 126403
    Scientific journal

  • Keigo Oyama, Musashi Seike, Koji Mitamura, Seiji Watase, Toyoko Suzuki, Taro Omura, Hideto Minami, Tomoyasu Hirai, Yoshinobu Nakamura, Syuji Fujii
    American Chemical Society (ACS), Apr. 2021, Langmuir, 37(15) (15), 4599 - 4610
    Scientific journal

  • Chihiro Kubota, Daisuke Morita, Keisuke Fujita, Sonoka Yamamoto, Toyoko Suzuki, Kentaro Okano, Masahiro Funahashi, Masaki Horie, Atsunori Mori
    Regioregular polythiophene bearing a benzenesulfonate group, which involved an alkylene spacer between thiophene and benzene ring, was synthesized. The obtained polythiophene was shown to improve its conductivity by heating the polymer thin film through the transformation of the ester group into the corresponding sulfonic acid.
    2021, Heterocycles, 103(1) (1)
    Scientific journal

  • Miku Onishi, Yuya Tsujishita, Wei Li, Toyoko Suzuki, Hideto Minami
    American Chemical Society (ACS), Dec. 2020, ACS Omega, 5(51) (51), 33047 - 33052
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Mana Fujii, Junichi Tsukiji, Takanori Nakano, Taro Omura, Toyoko Suzuki, Hideto Minami
    American Chemical Society (ACS), Dec. 2020, Macromolecules, 53(24) (24), 11027 - 11032
    Scientific journal

  • Taro Omura, Toyoko Suzuki, Hideto Minami
    In this study, we report the preparation of hollow cellulose particles via a solvent-releasing method with the ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim]Ac). A dispersion comprising [Emim]Ac droplets with dissolved cellulose and a hexane medium containing a stabilizer was poured into a large amount of acetone (precipitant), resulting in the precipitation of cellulose and the formation of solid cellulose particles with a hollow structure. We found that the formation of the hollow structure resulted from the equilibrium phase separation. Porous structures were also obtained using ethanol or t-butanol as a precipitant, where cellulose immediately precipitated (i.e., exhibited non-equilibrium phase separation). In the case where acetone was used as the precipitant, the diffusion rate of [Emim]Ac from the droplets into the precipitant was relatively low that is, the precipitation of cellulose was delayed, which allowed the cellulose to be phase-separated into a thermodynamically stable structure (equilibrium phase separation), resulting in the formation of the hollow structure.
    American Chemical Society, Nov. 2020, Langmuir, 36(46) (46), 14076 - 14082, English
    Scientific journal

  • Hiroshi Kobayashi, Toyoko Suzuki, Amorn Chaiyasat, Masayoshi Okubo
    In previous studies, it was found that a large amount of the polyoxyethylene nonylphenyl ether nonionic emulsifier, Emulgen 911 (E911), was incorporated inside polymer particles obtained at the completion of a conventional emulsion polymerization with potassium persulfate as a typical water-soluble initiator. In this study, to understand the incorporation phenomenon in more detail, the incorporation behavior during a batch emulsion polymerization of styrene was investigated. The percentage of E911 incorporated inside polystyrene (PS) particles relative to the total weight of E911 used in the polymerization increased to 18% until 50% conversion and then decreased and levelled off to 13% at 70-80% conversion. A similar incorporation behavior was observed in a seeded emulsion polymerization of styrene, in which E911 was added to an emulsifier-free PS seed emulsion to set the same E911 concentration as the batch emulsion polymerization before swelling of the PS seed particles with styrene at 70 °C for 24 h. These indicate that E911 molecules absorbed once into styrene-swollen PS particles partially exited therefrom into the aqueous medium during the polymerizations. When the E911 concentration in the aqueous medium is kept above the critical micelle concentration for a long period by the repartitioning process of E911 from styrene droplets into styrene-swollen particles via aqueous medium and/or exiting from the styrene-swollen particles into the aqueous medium, secondary particle nucleation continues during the polymerization, resulting in PS particles having a broad size distribution.
    American Chemical Society, Aug. 2020, Langmuir, 36(33) (33), 9747 - 9755, English
    Scientific journal

  • Takanori Nakano, Mitsuyoshi Yamane, Aya Kurozuka, Toyoko Suzuki, Hideto Minami
    Micrometer-sized poly(ionic liquid) (PIL) particles with an anionic side chain, poly(1-butyl-3-methylimidazolium 3-sulfopropyl methacrylate) (poly([Bmim][SPMT])), are successfully prepared by dispersion polymerization at 60 degrees C in ethanol/ethyl acetate (2/8, w/w) with poly(vinylpyrrolidone) as a stabilizer. However, the obtained particles do not maintain the particulate state during drying at room temperature due to poly([Bmim][SPMT])'s low glass-transition temperature, below room temperature. In order to prevent coalescence and maintain particle shape, a cross-linking monomer is added after the nucleation stage of dispersion polymerization. Moreover, Fourier-transform infrared spectroscopy (FT-IR) demonstrates cation exchange between the obtained particles and metal cations (Ag+).
    WILEY-V C H VERLAG GMBH, Jul. 2020, MACROMOLECULAR RAPID COMMUNICATIONS, 41(14) (14), English
    [Refereed]
    Scientific journal

  • Atsunori Mori, Keisuke Fujita, Chihiro Kubota, Toyoko Suzuki, Kentaro Okano, Takuya Matsumoto, Takashi Nishino, Masaki Horie
    Differently substituted thiophene-thiophene-alternating copolymers were formally synthesized employing a halo-bithiophene as a monomer. Nickel-catalyzed polymerization of bithiophene with substituents at the 3-position, including alkyl-, fluoroalkyl-, or oligosiloxane-containing groups, afforded the corresponding copolymers in good to excellent yield. The solubility test in organic solvents was performed to reveal that several copolymers showed a superior solubility. X-ray diffraction analysis of the thin film of the alternating copolymers composed of methyl and branched oligosiloxane substituents was also performed, and the results suggested the formation of a dual-layered film structure.
    BEILSTEIN-INSTITUT, Mar. 2020, BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY, 16, 317 - 324, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yuki Fujii, Kaori Imagawa, Taro Omura, Toyoko Suzuki, Hideto Minami
    We reported the preparation of porous cellulose particles by the solvent-releasing method, in which a solution of cellulose, dissolved in 1-butyl-3-methylimidazolium chloride and N,N'-dimethylformamide, was dropped into a large amount of 1-butanol using a syringe. The obtained particles had a high specific area because of their porous structure. Herein, to functionalize the cellulose particles, carboxylate groups are introduced into their porous structure by 2,2,6,6-tetramethylpiperidine-1-oxyl-mediated oxidation and ion exchange of carboxylate groups to Ag cations is conducted. Composite cellulose/Ag particles were synthesized by the reduction reaction using the carboxylate groups as a scaffold without free silver nanoparticles in the medium. The obtained composite particles exhibited a high catalytic ability, which was evaluated by examining the reduction of 4-nitrophenol. Moreover, we determined that the catalytic efficiency was maintained for at least three cycles by immobilizing Ag on cellulose particles.
    AMER CHEMICAL SOC, Feb. 2020, ACS OMEGA, 5(4) (4), 1919 - 1926, English
    [Refereed]
    Scientific journal

  • Atsunori Mori, Chihiro Kubota, Keisuke Fujita, Masayasu Hayashi, Tadayuki Ogura, Toyoko Suzuki, Kentaro Okano, Masahiro Funahashi, Masaki Horie
    A regioregular head-to-tail (HT)-type polythiophene was synthesized by the deprotonative nickel-catalyzed cross-coupling polymerization of 2-chlorothiophene bearing a neopentyl benzenesulfonate group at the 3-position. The obtained HT-regioregular polymer was found to dissolve in chloroform or THF, while it became soluble in water upon heating at 185 degrees C for 10 min by the liberation of the protected neopentyl group. The thin film of the polymer showed a remarkable improvement in conductivity of ca. 10(3) times before/after heating, suggesting the thermally induced intramolecular doping of polythiophene by the formed sulfonic acid at the side chain. The related doping was also observed in a poly(phenylacetylene) derivative, which was synthesized by rhodium-catalyzed polymerization. Copolymerization of such thiophene- and acetylene-bearing neopentyl sulfonate with 3-alkylthiophene and phenylacetylene, respectively, produced the corresponding statistical copolymers, demonstrating the formal self-doping of poly(3-alkylthiophene) and poly(phenylacetylene).
    AMER CHEMICAL SOC, Feb. 2020, MACROMOLECULES, 53(4) (4), 1171 - 1179, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Ken Mukai, Yuki Fujii, Mitsuyoshi Yamane, Toyoko Suzuki, Hideto Minami

    Composite particles consisting of elastic silicone and glassy poly(methyl methacrylate) were prepared. The morphology of the particles could be alternated between sea-island and core–shell structures by controlling the annealing temperature.

    Royal Society of Chemistry (RSC), 2020, Polymer Chemistry, 11(39) (39), 6328 - 6334
    Scientific journal

  • Atsunori Mori, Masayasu Hayashi, Mitsuru Matsuoka, Shiomi Ashida, Yukiko Ito, Kohei Hosokawa, Toyoko Suzuki, Kentaro Okano, Chi Hsien Wang, Masaki Horie
    © 2020 The Japan Institute of Heterocyclic Chemistry. Nosyl annulation of a bithiophene derivative with nosylamide (NsNH2) gives a 5-7-5 fused N, S-heterocyclic compound. The detailed molecular structure of the obtained nosylamide was analyzed by single-crystal X-ray crystallography. The obtained product was transformed into several amines and amides. The C-Br bond at the fused heterocycle was also subjected to cross-coupling reactions, where the nosyl group was found to be tolerant.
    2020, Heterocycles, 101(2) (2), 461 - 470, English
    [Refereed][Invited]
    Scientific journal

  • Hiroki Mitsui, Ken Mukai, Satoshi Ikubo, Toyoko Suzuki, Hideto Minami
    To prepare cross-linked silicone (silicone rubber) particles in an aqueous medium, we investigated two synthesis methods involving a miniemulsion system. The first method was based on cationic ring-opening polymerization of cyclic siloxane, which is a common synthetic route for linear silicone oil and uses octamethylcyclotetrasiloxane (D-4) as the monomer and dimeric D-4 (bis-D-4) as the cross-linker. Although this method produces silicone particles, the particles do not remain in the particulate state after drying because of low cross-linking density. The polymerization mechanism of this method was also investigated, which proceeds under the ring-opening reaction of D-4 in monomer droplets and upon polycondensation of hydrolyzed D-4, which occurs in the water phase (ie, outside the monomer droplets). This mechanism implied that introducing the cross-linking structure into particles is difficult because of the low solubility of bis-D-4 in water. To overcome these difficulties, we demonstrated a second method of preparing silicone particles based on the thiol-Michael addition reaction between thiol-terminated silicone oil and triacrylate in miniemulsion systems. Transmission electron microscopy images indicated that the silicone particles obtained in the particulate state upon drying and the aggregates of these particles showed elasticity.
    WILEY, Dec. 2019, POLYMERS FOR ADVANCED TECHNOLOGIES, 30(12) (12), 3003 - 3010, English
    [Refereed]
    Scientific journal

  • Takuto Ouchi, Ryuma Nakamura, Toyoko Suzuki, Hideto Minami
    Composite particles were prepared by the seeded polymerization of an ionic liquid monomer ([2-(methacryloyloxy)ethyl]trimethylammonium bis(trifluoromethanesulfonyl)amide) ([MTMA][TFSAD in the presence of poly(methyl methacrylate) (PMMA) particles. The obtained particles have a core-shell morphology: PMMA core and P([MTMA][TFSA]) shell. To change the composite particle morphology from core-shell to Janus, we used the solvent-absorbing/releasing method with methyl isobutyl ketone, which is a suitable solvent for PMMA and P([MTMA]-[TFSA]) with nonionic surfactants (polyoxyethylene nonylphenyl ether, Emulgen 950) and Li[TFSA]. Based on the ultrathin cross-section observations, we found the core-shell PMMA/P([MTMA][TFSA]) composite particle morphology changed to a Janus structure. Moreover, anion exchange occurred in the obtained Janus particles. When using LiBr, we obtained PMMA hemisphere particles because of the changes in the PIL hemisphere polarity via anion exchange and dissolution in water. On the contrary, the use of poly(sodium styrenesulfonate) maintained the Janus structure because of ionic cross-linking and the changes in the PIL hemisphere to hydrophilic properties, which became swollen with medium water.
    AMER CHEMICAL SOC, Nov. 2019, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 58(46) (46), 20996 - 21002, English
    [Refereed]
    Scientific journal

  • Wei Li, Toyoko Suzuki, Hideto Minami
    In this study, cylindrical polystyrene particles were applied as a particulate stabilizer to prepare a Pickering emulsion of decane (oil)/water. Unlike the spherical particles that are typically used in Pickering emulsions, the cylindrical particles enhanced the emulsion's stability (up to 1 year). Furthermore, the cylindrical particulate stabilizer enabled a stable emulsion across a wide range of pH. Notably, unique adsorption behavior of the cylindrical particles on an oil droplet was observed, in which the cylindrical particles connected head to head to form a network that acted as a cage around the oil droplet. (C) 2019 Elsevier Inc. All rights reserved.
    ACADEMIC PRESS INC ELSEVIER SCIENCE, Sep. 2019, JOURNAL OF COLLOID AND INTERFACE SCIENCE, 552, 230 - 235, English
    [Refereed]
    Scientific journal

  • Yushin Shibuya, Naoki Nakagawa, Naoki Miyagawa, Toyoko Suzuki, Kentaro Okano, Atsunori Mori
    Wiley, Jul. 2019, Angewandte Chemie, 131(28) (28), 9647 - 9650
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yushin Shibuya, Naoki Nakagawa, Naoki Miyagawa, Toyoko Suzuki, Kentaro Okano, Atsunori Mori
    The unprecedented synthesis of regioregular head-to-tail-type poly(1,4-arylene)s bearing different substituents at the 2- and 5-positions is described. They were prepared by the polymerization of 2,5-disubstituted bromo(chloro)arylenes by selective halogen-metal exchange with a Grignard reagent and subsequent cross-coupling polymerization with a nickel catalyst [NiCl2(dppp)]. Formation of the regioregular poly(1,4-arylene)s were confirmed by NMR spectroscopy, and showed remarkable differences to those polymers having uncontrolled regioregularity. Polymerization of bromo(chloro)arylenes with a chiral alkoxy substituent also led to the regioregular head-to-tail-type polyarylene, which demonstrated circular dichroism, thus suggesting formation of a structure with higher-order regularity.
    WILEY-V C H VERLAG GMBH, Jul. 2019, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 58(28) (28), 9547 - 9550, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Tadayuki Ogura, Chihiro Kubota, Toyoko Suzuki, Kentaro Okano, Norikazu Tanaka, Takuya Matsumoto, Takashi Nishino, Atsunori Mori, Takumi Okita, Masahiro Funahashi
    Preparation of 2-halo-3-substituted-thiophene bearing a cyclic oligosiloxane moiety in the side chain was carried out and subjected to nickel(II)-catalyzed deprotonative polymerization to give the corresponding polythiophene, which was found to be highly soluble in various organic solvents particularly in hexanes. Treatment of the thin film of the obtained polythiophene with acidic vapor resulted in cross linking of the cyclic siloxane moiety through ring opening. Accompanying doping of the polythiophene main chain on the polymer film indicated improved conductivity with remarkably drastic change in before/after acidic treatment.
    CHEMICAL SOC JAPAN, Jun. 2019, CHEMISTRY LETTERS, 48(6) (6), 611 - 614, English
    [Refereed]
    Scientific journal

  • Atsunori Mori, Shiomi Ashida, Yukiko Ito, Jiaqiang Cheng, Toyoko Suzuki, Kentaro Okano, Takayoshi Hashimoto
    DFT calculation studies were performed for the estimation of racemization barrier of winding vine-shaped heterobiaryls showing molecular asymmetry. The calculated value showed good agreement compared with that derived from experimental studies. Effects of hetroaromatic structure, carbon-carbon double bond at the winding-vine moiety, substituent at the double bond, and substituent at the heteroaromatic rings were studied.
    PERGAMON-ELSEVIER SCIENCE LTD, Apr. 2019, HETEROCYCLES, 99(1) (1), 294 - 300, English
    [Refereed]
    Scientific journal

  • Toyoko Suzuki, Yunfeng Li, Albert Gevorkian, Eugenia Kumacheva
    This study reports microfluidic generation of Janus droplets that consist of a liquid crystal component (a cholesteric aqueous suspension of cellulose nanocrystals, Ch-CNC) and a mineral oil (MO) component. The composition of the droplets was controlled by varying the relative flow rates of MO and Ch-CNC suspension. The shape of the Ch-CNC component of the droplets was changed from a truncated sphere to a hemisphere to a crescent moon. For these three Ch-CNC phase shapes, the Ch packing of the CNC pseudolayers was preserved, however the Ch pitch reduced, which was ascribed to the change in CNC orientation at the Ch-CNC/MO interface from perpendicular to parallel. The shape of the compound droplets was tuned from a dumbbell to a sphere by reducing interfacial tension between the Ch-CNC suspension and MO phases. Photopolymerization of the monomer mixture introduced in the Ch-CNC phase of the droplets and the removal of the sacrificial MO phase enabled the generation of Ch microgels. The results of this work can be used for exploring new applications of Janus colloids and the fabrication of programmable active soft matter.
    ROYAL SOC CHEMISTRY, Dec. 2018, SOFT MATTER, 14(47) (47), 9713 - 9719, English
    [Refereed]
    Scientific journal

  • Taro Omura, Kaori Imagawa, Toyoko Suzuki, Hideto Minami
    We previously reported the preparation of cellulose particles by the solvent releasing method (SRM). The obtained cellulose particles had a porous structure filled with a surrounding medium. However, the structure was fragile and easily collapsed because of the capillary pressure as the medium evaporated, resulting in dense cellulose particles. To control the morphology of the cellulose particles in a dry state, we focused our study on the influence of the surface tension of the surrounding medium on the structure of cellulose particles because the capillary pressure is proportional to the surface tension. Different media such as toluene, acetone, and pentane were investigated. The morphologies of the resulting cellulose particles were estimated by volume changes, specific surface areas, and compressive strengths. From these results, as the surface tension of the media filling the particles was lowered, particle's specific surface area increased, resulting in the formation of softer particles.
    AMER CHEMICAL SOC, Dec. 2018, LANGMUIR, 34(50) (50), 15490 - 15494, English
    [Refereed]
    Scientific journal

  • Moien Alizadehgiashi, Nancy Khuu, Amir Khabibullin, Andria Henry, Moritz Tebbe, Toyoko Suzuki, Eugenia Kumacheva
    We report a nanocolloidal hydrogel that combines the advantages of molecular hydrogels and nanoparticle-based scavengers of heavy metal ions. The hydrogel was formed by the chemical cross-linking of cellulose nanocrystals and graphene quantum dots. Over a range of hydrogel compositions, its structure was changed from lamellar to nanofibrillar, thus enabling the control of hydrogel permeability. Using a microfluidic approach, we generated nanocolloidal microgels and explored their scavenging capacity for Hg2+, Cu2+, Ni2+, and Ag+ ions. Due to the large surface area and abundance of ion-coordinating sites on the surface of nanoparticle building blocks, the microgels exhibited a high ion-sequestration capacity. The microgels were recyclable and were used in several ion scavenging cycles. These features, in addition to the sustainable nature of the nanoparticles, make this nanocolloidal hydrogel a promising ion-scavenging material.
    AMER CHEMICAL SOC, Aug. 2018, ACS NANO, 12(8) (8), 8160 - 8168, English
    [Refereed]
    Scientific journal

  • Naoki Miyagawa, Toyoko Suzuki, Kentaro Okano, Takuya Matsumoto, Takashi Nishino, Atsunori Mori
    Polyamide composed of furan dimer, which is prepared from biomass-derived organic molecule 2-furfural, is synthesized. The reaction of 2,2-furan dimer 5,5-dicarbonyl chloride with several 1,-diamines was carried out with a solution or interfacial polycondensation leading to the corresponding polyamide. Measurement of the melting point was performed resulting to exhibit a higher temperature compared with the related polyamide bearing a single furan ring composed of furan-2,5-dicarboxylic acid (FDCA). Thermal analyses (TG-DTA) also indicated higher temperatures of decomposition than those of FDCA-derived polyamide. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1516-1519
    WILEY, Jul. 2018, JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 56(14) (14), 1516 - 1519, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Wei Li, Toyoko Suzuki, Hideto Minami
    A facile and novel approach to prepare monodisperse polystyrene (PS) particles having a cylindrical shape was discovered. Spherical PS particles prepared by dispersion polymerization were stirred in a polyvinylpyrrolidone (PVP) aqueous solution for several hours using a magnetic stirrer at room temperature. In the presence of PVP, the spherical PS particles deformed into cylindrical shapes following stirring; however, the particles did not deform in the absence of PVP. The deformation rate of the particles was affected by the molecular weight of the dissolved PVP. This stirring method is not only highly efficient and high yielding, but also applicable to other materials such as polymethyl methacrylate. Moreover, the cylindrical particles were successfully applied as particulate surfactants in a Pickering emulsion system, which exhibited excellent stability in comparison to a system using spherical particles as a surfactant. In the first case, the emulsion was left standing for more than 4 months.
    WILEY-V C H VERLAG GMBH, Jul. 2018, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 57(31) (31), 9936 - 9940, English
    [Refereed]
    Scientific journal

  • Kaori Imagawa, Taro Omura, Yasuhito Ihara, Kyosuke Kono, Toyoko Suzuki, Hideto Minami
    Disk-like cellulose particles were facilely prepared by stirring a dispersion of spongy cellulose particles that were prepared with a solvent-releasing method (SRM) with a magnetic stir bar. The obtained particles were thick and disk-like and retained their spongy structure in the wet state. The thick, disk-like particles became thinner in a specific direction upon drying because of capillary force. In contrast, when the same procedure was conducted using cellulose particles with dense structures, the particle shapes were not deformed, and disk-like shapes did not appear. Moreover, when the stirring was carried out using a shaking bath or a touch mixer, the shape transformation was not observed. These results suggest that the spongy structure of the cellulose particles would be a pseudo-plasticization state, which can cause the cellulose particles to deform. The disk-like particles formed as a result of the grinding of spongy cellulose particles between the stir bar and the vial. The number of disk-like particles and the degree of deformation increased with increasing of the stirring time, the speed and the contact area.
    SPRINGER, Aug. 2017, CELLULOSE, 24(8) (8), 3111 - 3118, English
    [Refereed]
    Scientific journal

  • Aya Kurozuka, Shohei Onishi, Takuto Nagano, Katsumi Yamaguchi, Toyoko Suzuki, Hideto Minami
    Emulsion polymerization of styrene was conducted using a biosurfactant (i.e., sodium surfactin, hereinafter 30 called just "surfactin") having very low critical micelle concentration (CMC, 2.9 X 10(-3) rnmol/L) and biodegradability characteristics. The nucleation mechanism was investigated by comparing with a conventional surfactant sodium dodecyl sulfate) system. Unlike the emulsion polymerization systems using conventional surfactants, nucleation mechanisms changed above CMC in the presence of a biosurfactant. At low concentrations of surfactin (above CMC), the polystyrene (PS) particles are likely generated via a soap-free emulsion polymerization mechanism. In contrast, at high surfactin concentrations, the PS particles would be synthesized by following a micellar nucleation mechanism. However, the slope (0.23) of the log N-p versus log C-s plot (N-p: number of particles; C-s: concentration of surfactin) did not obey the Smith Ewart theory (0.6), this probably being produced by the high adsorbability of surfactin.
    AMER CHEMICAL SOC, Jun. 2017, LANGMUIR, 33(23) (23), 5814 - 5818, English
    [Refereed]
    Scientific journal

  • Masayoshi Okubo, Hiroshi Kobayashi, Chujuan Huang, Eri Miyanaga, Toyoko Suzuki
    Submicrometer-sized raspberry-like polystyrene (PS) particles, which were prepared by emulsion polymerization with polyoxyethylene nonylphenyl ether nonionic emulsifier (Emulgen 910, HLB 12.2) and potassium persulfate initiator, contained 8.5 vol % (relative to the particle) of water and 5.5 wt % (relative to PS) of Emulgen 910 in the inside. The water absorption decreased the glass transition temperature of the PS particles dispersed in an aqueous medium. The wt % (relative to PS) of the incorporated Emulgen 910 increased with increasing initial Emulgen 910 concentration in the emulsion polymerization, but the wt % (relative to the total Emulgen 910 used) of the incorporated Emulgen 910 was constant at approximately 50% independent of the initial concentration. The vol % (relative to particle) of water increased to 46% by heat treatment at 90 degrees C for 24 h, which was based on further water absorption, and resulted in spherical hollow particles, where the amount of the incorporated Emulgen 910 remarkably decreased in a short treatment and then remained almost constant during the heat treatment. After another 24 h treatment, the percentage of nonhollow particles increased gradually, which was based on the escape of the water domain together with Emulgen 910 from the inside of the particles. On the other hand, spherical PS particles prepared by emulsifier-free emulsion polymerization did not contain water in the inside and were not changed to hollow ones by a similar heat treatment. From these results, an innovative easy method to synthesize hydrophobic hollow PS particles is proposed.
    AMER CHEMICAL SOC, Apr. 2017, LANGMUIR, 33(14) (14), 3468 - 3475, English
    [Refereed]
    Scientific journal

  • Masayoshi Tokuda, Toyoko Suzuki, Hideto Minami
    Composite particles comprising poly(2-phenylethyl methacrylate) (PPhEMA) and imidazolium-based poly(ionic liquid)s were prepared by suspension polymerization of 1-vinyl-3-ethylimidazolium bis(trifluoromethanesulfonyl)amide as an ionic liquid monomer with dissolved PPhEMA. Not only PPhEMA exhibits lower critical solution temperature (LCST) behavior in 1-vinyl-3-ethylimidazolium bis(trifluoromethanesulfonyl)amide but also the polymer blend in the bulk state exhibited LCST behavior. However, the composite polymer particles obtained after polymerization at 70 degrees C maintained a homogeneous inner structure after heat treatment as the polymerization temperature was greater than the LCST in this system due to the formation of a cross-linked structure during polymerization. When the composite particles were prepared by suspension polymerization at 30 degrees C, their inner morphology changed from homogeneous to phase separated during the subsequent heat treatment. Moreover, the morphology transformation of the composite particles was dependent on the PPhEMA molecular weight. Copyright (c) 2016 John Wiley & Sons, Ltd.
    WILEY, Apr. 2017, POLYMERS FOR ADVANCED TECHNOLOGIES, 28(4) (4), 470 - 475, English
    [Refereed]
    Scientific journal

  • Hideto Minami, Akihiro Kojima, Toyoko Suzuki
    Flattened cross-linked hollow poly(divinylbenzene) (PDVB) particles with encapsulated n-hexadecane (HD) were successfully prepared through suspension polymerization using the self -assembling of phase-separated polymer (SaPSeP) method, in which the solid dispersion medium was gelled by gellan gum and compressed. The solid phase induced by gellan gum can be easily changed to a liquid state by heating, allowing the obtained particles to be easily recovered after polymerization. When the polymerization was conducted in the solid dispersion medium without compression, spherical hollow PDVB/HD composite particles were obtained. In contrast, when the polymerization was conducted with the compression of the solid dispersion medium, flattened hollow PDVB/HD composite particles were obtained. The shape of the flattened hollow polymer particles was controlled by changing the compression ratio of the solid phase, and the size could also be controlled by changing the DVB/HD droplet size using the Shirasu porous glass membrane-emulsification technique. Furthermore, flattened hollow particles larger than 20 mu m in size were obtained, but it was difficult to obtain spherical hollow particles of such large size using the SaPSeP method.
    AMER CHEMICAL SOC, Feb. 2017, LANGMUIR, 33(6) (6), 1541 - 1546, English
    [Refereed]
    Scientific journal

  • Taro Omura, Kaori Imagawa, Kyosuke Kono, Toyoko Suzuki, Hideto Minami
    We have reported cellulose particles with a spongy structure that we prepared by the solvent releasing method (SRM) from cellulose droplets composed of cellulose, 1-butyl-3-methylimidazoliumchrolide ([Bmim] Cl), and N,N-dimethylformamide (DMF). The spongy structure collapsed as the medium evaporated, resulting in dense cellulose particles. In this study, we encapsulated the hydrophilic and hydrophobic fluorescent substances in these particles to investigate the use of such particles in potential applications that require encapsulating of substances (e.g., drug delivery). Wet cellulose particles retained their spongy structure in both hydrophobic and hydrophilic media. When the spongy cellulose particles were dispersed in a solution containing nonvolatile solutes, these solutes were driven into the cellulose particles as media evaporated. Subsequently, the cellulose particles collapsed and encapsulated the nonvolatile solutes. Regardless of whether the solute was hydrophilic or hydrophobic, the encapsulation efficiency exceeds 80%. The maximum loading reflected the saturated solubility of solute in solution that filled the cellulose beads. Moreover, the encapsulated solute was released by dispersing the cellulose beads in the solvent, and the rate of release of the encapsulated solute could be controlled by coating the cellulose beads with a conventional polymer.
    AMER CHEMICAL SOC, Jan. 2017, ACS APPLIED MATERIALS & INTERFACES, 9(1) (1), 944 - 949, English
    [Refereed]
    Scientific journal

  • Toyoko Suzuki, Tsugumi Mizowaki, Masayoshi Okubo
    When encapsulated n-hexadecane (HD) in polymer microcapsules is used for heat storage material, two problems that are the decreasing of latent heat (J/g-capsules, J/g-HD) and the generating of supercooling (Delta T-s:degrees C) should be overcome. In previous studies, it was suggested that more polar polymer capsule shell and larger particle size were useful to improve the two problems, respectively. Based on the idea, first, 6mm- sized, polar poly(ethylene glycol dimethacrylate) (PEGDM) particles with encapsulated HD were prepared by microsuspension conventional radical polymerization (ms CRP) with Self-assembly of PhaseSeparated Polymer (SaPSeP) method that the authors proposed. As expected, the heat of solidification of the encapsulated HD (Delta H-s* = 220 J/g-HD) was almost the same as that of pure HD (Delta H-s(degrees) = 230 J/g-HD) but the supercooling was still observed (Delta T-s = 10 degrees C). Larger PEGDM particles (11-and 42-mu m in diameter) prepared by the ms CRP "included" HD in the inside, but did not "encapsulate" it ideally, because they had porous structures. Ideal large PEGDM microcapsules (31 mu m in diameter) with "encapsulated" HD were successfully prepared by utilizing microsuspension activators generated by electron transfer atom transfer radical polymerizations (ms AGET ATRP), which is one of controlled/living radical polymerization. They had excellent heat storage abilities (Delta H-s = 105 J/g-capsules; Delta H-s* = 210 J/gHD;Delta T-s -6 degrees C). (C) 2016 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Dec. 2016, POLYMER, 106, 182 - 188, English
    [Refereed]
    Scientific journal

  • Takaaki Tsuruoka, Misato Kumano, Koji Mantani, Tetsuhiro Matsuyama, Ayumi Miyanaga, Takashi Ohhashi, Yohei Takashima, Hideto Minami, Toyoko Suzuki, Kaori Imagawa, Kensuke Akamatsu
    We report a new paradigm for the synthesis of metal organic framework (MOP) crystals with controlled thickness by utilizing interfacial self-assembly of frameworks on metal ion-doped polymer precursors. The approach involves preparation of metal ion-doped polymer precursors through ion-exchange reactions and synthesis of MOF crystals by immersion into solutions containing organic ligands. The thickness of the resulting MOF crystals can be readily controlled by the number of doped-metal ions in the polymer precursors. MOF crystals could be very important and potentially useful for applications, and the present approach based on interfacial self-assembly could significantly advance MOF crystal preparation techniques.
    AMER CHEMICAL SOC, May 2016, CRYSTAL GROWTH & DESIGN, 16(5) (5), 2472 - 2476, English
    [Refereed]
    Scientific journal

  • Ryuma Nakamura, Masayoshi Tokuda, Toyoko Suzuki, Hideto Minami
    Poly(ionic liquid) (PIL) particles with a single-hollow structure are prepared by suspension polymerization from monomer droplets consisting of the hydrophobic ionic liquid monomer [2-(methacryloyloxy)ethyl]trimethylammonium bis(trifluoromethanesulfonyl)amide, ethylene glycol dimethacrylate, and n-butyl acetate containing dissolved poly(n-butyl methacrylate). The obtained PIL hollow particles' shells can be changed from hydrophobic to hydrophilic by anion exchange using a LiBr/ethanol solution. In the case of hydrophilic PIL hollow particles, the water-soluble fluorescent materials can penetrate into the hollow structure, whereas in the case of hydrophobic PIL hollow particles, penetration of the fluorescent materials is restricted. In addition, the encapsulated water-soluble materials can be preserved into the hollow part by changing the shell property of the PIL particle encapsulated with the water-soluble materials from hydrophilic to hydrophobic.
    AMER CHEMICAL SOC, Mar. 2016, LANGMUIR, 32(10) (10), 2331 - 2337, English
    [Refereed]
    Scientific journal

  • Masayoshi Tokuda, Tatsunori Shindo, Toyoko Suzuki, Hideto Minami
    Seeded dispersion polymerization of an ionic liquid monomer ([2-(methacryloyloxy)ethyl]trimethylammonium bis(trifluoromethanesulfonyl)amide) ([MTMA][TFSA]) was carried out in the presence of poly(methylmethacrylate) (PMMA), poly(ethyl methacrylate) (PEMA), and poly(t-butyl methacrylate) (PtBMA) as seed particles in a methanol/water mixture. For PMMA and PEMA seed particles, composite particles with poly(ionic liquid) (PIL) were obtained. In contrast, for PtBMA seed particles, secondary nucleated PIL particles were formed and no PtBMA/PIL composite particles were obtained. These results were also predicted by theoretical consideration based on the spreading coefficients calculated from the interfacial tensions. Moreover, we showed that anion exchange of the PIL-core in the PIL/cross-liked PMMA core-shell composite particles from TFSA to Br and FeCl4 anions can be used to modify the properties of only the core component of the composite particles.
    ROYAL SOC CHEMISTRY, 2016, RSC ADVANCES, 6(37) (37), 31574 - 31579, English
    [Refereed]
    Scientific journal

  • Preparation of Thermosensitive “Snowman-like” Composite Gel Particles Incorporating an Ionic Liquid
    MINAMI Hideto, ICHIKAWA Hiroko, SUZUKI Toyoko
    概要
    発行機関名, 2015, J. Adhesion Soc. Jpn, 51, 225 - 226, English
    [Refereed]
    Scientific journal

  • K. Kinoshita, H. Yanagimoto, T. Suzuki, H. Minami
    The influence of the structure of ionic liquids on the crystallinity of aluminum hydroxide (Al(OH)(3)) prepared by a sol-gel process with aluminum isopropoxide (Al(OPri)(3)) in imidazolium-based ionic liquids was investigated. When Al(OH)(3) was prepared in ionic liquids having long alkyl chains, such as 1-butyl-3-methylimidazolium salts and 1-methyl-3-octylimidazolium salts, highly crystalline products were obtained. In contrast, Al(OH)(3) obtained using the 1-ethyl-3-methylimidazolium salt was an amorphous material, indicating that hydrophobic interaction of the alkyl tail of the imidazolium cation of the ionic liquid strongly affects the crystallinity of sol-gel products and the local structure of the ionic liquid. Moreover, the crystallinity of Al(OH)(3) prepared in ionic liquids increased relative to the amount of additional water (ionic liquid/water = 1.28/2.0-3.5/0.2, w/w). In the case of addition of a small amount of water (ionic liquid/water = 3.5/0.2, w/w), the product was amorphous. These results implied that the presence of an ionic liquid and a sufficient amount of water was crucial for the successful synthesis of sol-gel products with high crystallinity. H-1 NMR analyses revealed a shift of the peak associated with the imidazolium cation upon addition of water, which suggested that the molecular orientation of the ionic liquid was similar to that of a micelle.
    ROYAL SOC CHEMISTRY, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17(28) (28), 18705 - 18709, English
    [Refereed]
    Scientific journal

  • Control of Morphology of ‘Rattle’-like Particles Prepared by One-step Suspension Polymerization
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    2015, J. Adhesion Soc. Jpn, 51, 233 - 234, English
    [Refereed]
    Scientific journal

  • Shohei Onishi, Masayoshi Tokuda, Toyoko Suzuki, Hideto Minami
    Janus particles with two hemispheres having different stabilizers, a polystyrene (PS) phase stabilized by poly(acrylic acid) (PAA) (PSPAA) and a poly(methyl methacrylate) (PMMA) phase stabilized by poly(vinylpyrrolidone) (PVP) (PMMA(PVP)), were synthesized by the solvent-absorbing/releasing method of PSPAA/PMMA(PVP) composite particles with a core-shell structure. The PSPAA/PMMAPVP composite particles were prepared by seeded dispersion polymerization of MMA using PVP as stabilizer in the presence of PS seed particles stabilized by PAA. We also demonstrated the facile formation of the colloidal chains via hydrogen bonding interaction between different stabilizers.
    AMER CHEMICAL SOC, Jan. 2015, LANGMUIR, 31(2) (2), 674 - 678, English
    [Refereed]
    Scientific journal

  • T. Suzuki, A. Osumi, H. Minami
    Multiple polymer particles encapsulated in a polymer shell are applied in electrophoretic ink. We demonstrate a simple one-step polymerization of polymer capsules containing small particles (rattle-like particles). In the obtained capsules, encapsulated particles independently dispersed and moved in response to the electric field.
    ROYAL SOC CHEMISTRY, Sep. 2014, CHEMICAL COMMUNICATIONS, 50(69) (69), 9921 - 9924, English
    [Refereed]
    Scientific journal

  • Masayoshi Tokuda, Toshiharu Sanada, Tatsunori Shindo, Toyoko Suzuki, Hideto Minami
    Emulsion polymerization of ionic liquid monomer [2-(methacryloyloxy)ethyl]trimethylammonium bis(trifluoromethanesulfonyl)amide ([MTMA][TFSA]) was performed. In the presence of potassium persulfate and sodium dodecyl sulfate as the ionic initiator and emulsifier, respectively, the system was colloidally unstable and coagulated, owing to anion exchange between the ionic liquid monomer and ionic emulsifier. When a nonionic initiator and emulsifier were used (2,2'-azobis 2-methyl-[1,1-bis(hydroxymethyl)-2-hydroxyethylpropionamide]; VA-080, polyoxyethylenesorbitan monooleate; Tween 80, respectively), a stable emulsion was obtained without coagulation, and the zeta potential of the prepared particles exhibited a high positive charge. Utilizing this surface charge, poly([MTMA][TFSA]) (PIL) particles were then successfully prepared via emulsifier-free emulsion polymerization without an ionic initiator. Moreover, the contact angle of water on the PIL emulsion film (emulsifier-free emulsion polymerization) was found to be similar to 70 degrees (static measurement), indicating that the surface of the PIL film was relatively hydrophobic. The retreating contact angle (similar to 28 degrees) also indicated water wettability. However, when water was dropped on the PIL film just after the water already on the surface had completely retreated, the PIL film was instantaneously hydrophobic again. This result suggests that responsiveness of the PIL emulsion film was switchable between hydrophobic (in air) and hydrophilic (in water).
    AMER CHEMICAL SOC, Apr. 2014, LANGMUIR, 30(12) (12), 3406 - 3412, English
    [Refereed]
    Scientific journal

  • Toyoko Suzuki, Kyosuke Kono, Kengo Shimomura, Hideto Minami
    Cellulose is a ubiquitous natural fiber used in various industrial materials and applications. We prepared micron-sized cellulose particles by the solvent releasing method (SRM) in which cellulose-[Bmim]Cl-N,N-dimethylformamide (DMF) droplets are dispersed in hexadecane (HD) containing dissolved surfactant. The dispersion is then poured into a large amount of 1-butanol. Since 1-butanol is miscible with HD, [Bmim]Cl, and DMF but not with cellulose, the cellulose particles precipitate out. FOR and H-1 NMR analyses confirmed that this technique precipitated cellulose and completely removed [Bmim]Cl and DMF from the cellulose-[Bmim]Cl-DMF droplets. Interestingly, the obtained cellulose particles were almost the same size as the original droplets (cellulose, 7 wt%), indicating a microporous structure of the cellulose particles with a large medium content. Although the microporous structure collapsed as the medium evaporated, it was maintained by a freeze-drying technique. (C) 2013 Elsevier Inc. All rights reserved.
    ACADEMIC PRESS INC ELSEVIER SCIENCE, Mar. 2014, JOURNAL OF COLLOID AND INTERFACE SCIENCE, 418, 126 - 131, English
    [Refereed]
    Scientific journal

  • MINAMI Hideto, CHANG Cheng, SUZUKI Toyoko
    Large polystyrene particles stabilized by polyvinylpyrrolidone (PVP) (PSPVP)-core/small silica particles (SiO2)-corona raspberry-like composite particles were successfully prepared by heterocoagulation technique utilizing hydrogen bonding interaction between the pyrrolidone group of PVP and the silanol group of SiO2. The coverage of the SiO2 corona particles on the PSPVP core particle could be controlled by changing the pH of dispersions and the molecular weight of PVP. Moreover, heterocoagulation of large poly(methyl methacrylate) particles stabilized by PVP and small SiO2 particles was also carried out, resulting in formation of raspberry-like composite particles. These results suggested that raspberry-like particles composed of various polymer particles and inorganic particles could be prepared by heterocoagulation technique utilizing hydrogen bonding interaction.
    Japan Society of Colour Material, 2014, Journal of the Japan Society of Colour Material, 87(10) (10), 356 - 360, Japanese

  • Hideto Minami, Kengo Shimomura, Toyoko Suzuki, Keiichi Sakashita, Tetsuya Noda
    In this study, reversible addition fragmentation chain transfer (RAFT) miniemulsion polymerization using a novel type of amphiphilic RAFT agent was investigated. The novel amphiphilic RAFT agent has a specific chemical structure in which a hydrophilic poly(ethylene glycol) chain is directly bonded to the "Z-group" position, and not the leaving group (R group), of the thiocarbonylthio group (RAFT group). As a result, the RAFT groups are localized at the interface of the water/monomer droplets (polymer particles) throughout the polymerization, unlike with a conventional amphiphilic RAFT agent. Polystyrene (PS) particles with a broad molecular weight distribution and 69% degree of livingness were successfully prepared using the novel RAFT agent in a manner similar to that for a conventional RAFT system. Notably, after the completion of polymerization, the RAFT groups could be easily removed from the dispersed PS particles via treatment with an excess of potassium persulfate, because the RAFT groups only exist near the particle surfaces.
    AMER CHEMICAL SOC, Jan. 2014, MACROMOLECULES, 47(1) (1), 130 - 136, English
    [Refereed]
    Scientific journal

  • Andreas Spaeth, Hideto Minami, Toyoko Suzuki, Rainer H. Fink
    Microencapsulated ionic liquids represent a novel type of material with high potential for various applications in chemical synthesis, catalysis or separation processes. We present a detailed morphological analysis of this material by means of two imaging techniques, i.e., scanning transmission X-ray microspectroscopy (STXM) and transmission electron microscopy (TEM). While TEM can be utilized only in the dry state, STXM offers access to high-resolution imaging in liquid surroundings. In either case prolonged illumination leads to degradation of the stabilizing polymer. We discuss potential scenarios, e.g., formation of perforations within the polymer shell, to explain the experimental findings.
    ROYAL SOC CHEMISTRY, 2014, RSC ADVANCES, 4(7) (7), 3272 - 3277, English
    [Refereed]
    Scientific journal

  • Nami Matsusaka, Toyoko Suzuki, Masayoshi Okubo
    Styrene (hydrophobic monomer), methyl methacrylate (MMA, hydrophilic monomer, almost 100 times more soluble in water than styrene) and nonionic emulsifier are often used in general emulsion polymerizations in industrial production. To clarify the effect of stirring for 100 min at 70 degrees C before starting emulsion polymerization with a nonionic emulsifier (polyoxyethylene nonyl phenyl ether, E911) and potassium persulfate as the initiator for the particle formation, the emulsion homopolymerization of styrene and MMA was carried out at different stirring rates (0-500 r.p.m.) at 70 degrees C. Immediately before the start of the polymerization, in the case of styrene, partitioning of components in the system nearly reached an equilibrium state at 500 r.p.m., whereas the system was in a nonequilibrium state at 240 r.p.m. In the case of MMA, the system nearly reached an equilibrium state even at 240 r.p.m. Polystyrene particles were obtained as similar to 100-nm-sized spherical particles at 240 r.p.m. and as similar to 1-mu m-sized 'bur-like' nonspherical particles at 500 r.p.m., whereas poly(MMA) particles were similar to 100-nm-sized and almost spherical at both stirring rates. Monomer polarity strongly affected the partitioning of the monomer to the aqueous phase and the nonionic emulsifier to the monomer phase before starting the emulsion polymerization, resulting in the differences in particle formation and the incorporation of nonionic emulsifier inside the polymer particles. Polymer Journal (2013) 45, 153-159; doi:10.1038/pj.2012.109; published online 20 June 2012
    NATURE PUBLISHING GROUP, Feb. 2013, POLYMER JOURNAL, 45(2) (2), 153 - 159, English
    [Refereed]
    Scientific journal

  • Hideto Minami, Yusuke Mizuta, Toyoko Suzuki
    Large polystyrene particles stabilized by poly(acrylic acid) (PAA) (L-PSPAA) (as the core) and small polystyrene particles stabilized by poly(vinyl pyrrolidone) (PVP) (S-PSPVP) (as the corona) were successfully used to prepare raspberry-like particles by a heterocoagulation technique utilizing the hydrogen bonding interaction between PAA and PVP. The coverage of L-PSPAA by S-PSPVP could be controlled by adding PVP homopolymer to the L-PSPAA dispersion and by changing the molecular weight of the stabilizers. Moreover, the heterocoagulation of large poly(methyl methacrylate) particles stabilized by PAA (L-PMMA(PAA)) and S-PSPVP particles was also accomplished, resulting in the formation of L-PMMA(PAA)-core/S-PSPVP-corona raspberry-like composite particles. These results suggested that the raspberry-like particles composed of various polymer particles could be formed by the heterocoagulation technique utilizing the hydrogen bonding interaction.
    AMER CHEMICAL SOC, Jan. 2013, LANGMUIR, 29(2) (2), 554 - 560, English
    [Refereed]
    Scientific journal

  • Hideto Minami, Hiroki Fukaumi, Masayoshi Okubo, Toyoko Suzuki
    Encapsulation of ionic liquid, 1-hexyl-3-methylimidazolium bis(trifluoromethane sulfonyl)amide ([Hmim][TFSA]), was carried out by microsuspension polymerization of ethylene glycol dimethacrylate (EGDM) utilizing the self-assembling of phase-separated polymer method, which had been proposed by us for the preparation of hollow polymer particles. After the optimization of the polymerization conditions, ionic liquid-encapsulated polymer particles, which have smooth surface morphology and a single hollow structure, were successfully prepared. Encapsulation efficiency of [Hmim][TFSA] was significantly improved from about 20-70 % by changing the shell polymer from polyEGDM homopolymer to poly(EGDM-butyl methacrylate) (50/50, w/w) copolymer, which was likely to have relatively low affinity for [Hmim][TFSA]. Additionally, ionic liquid-encapsulated polymer particles displaying ionic conductivity were successfully prepared using triethylene glycol dimethacrylate as divinyl monomer instead of EGDM.
    SPRINGER, Jan. 2013, COLLOID AND POLYMER SCIENCE, 291(1) (1), 45 - 51, English
    [Refereed]
    Scientific journal

  • Tomoe Yamagami, Takuya Tanaka, Toyoko Suzuki, Masayoshi Okubo
    Micrometer-sized, hemispherical polystyrene (PS) particles were successfully prepared by microsuspension polymerization of homogeneous styrene/hexadecane (HD) droplets dispersed in polyoxyethylene nonylphenyl ether (Emulgen 931) aqueous solution, followed by rapid removal of HD from formed PS/HD particles with a "Janus" structure. It was important for the formation of the morphology of Janus particles in thermodynamically stable state to carry out the polymerization slowly. The formation of by-product small PS particles by emulsion polymerization was suppressed by the additions of CuCl2 as a water-soluble inhibitor and NaCl to decrease the solubility of styrene in the aqueous phase.
    SPRINGER, Jan. 2013, COLLOID AND POLYMER SCIENCE, 291(1) (1), 71 - 76, English
    [Refereed]
    Scientific journal

  • Toyoko Suzuki, Hiroko Ichikawa, Masaya Nakai, Hideto Minami
    Composite gel particles consisting of 2-phenylethyl methacrylate (PhEMA)-vinyl toluene (VT) copolymer (P(PhEMA-VT)) and poly(methyl methacrylate) (PMMA) were prepared by seeded polymerization of MMA in the presence of P(PhEMA-VT)/1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide ([Bmim] [TFSA], IL) gel particles, in which P(PhEMA-VT) exhibited lower critical solution temperature (LCST)-type phase transition behavior in IL. The particles obtained at 70 degrees C (above the LCST) adopted a phase-separated snowman-like shape and clearly exhibited volume-phase transition behavior in which the P(PhEMA-VT) phase reduced in size and the PMMA phase increased in size above the LCST. The P(PhEMA-VT) phase exhibited LCST-type volume-phase transition behavior and separation of IL occurred. In contrast, the PMMA phase was swollen with IL separated from the P(PhEMA-VT) phase, in which the PMMA phase could act as a preserver of IL. Interestingly, the composite gel particles exhibited similar volume-phase transition behavior in both air and vacuum without leakage of IL from the gel particles, which should be free-standing thermosensitive gel particles.
    ROYAL SOC CHEMISTRY, 2013, SOFT MATTER, 9(6) (6), 1761 - 1765, English
    [Refereed]
    Scientific journal

  • Nami Matsusaka, Toyoko Suzuki, Masayoshi Okubo
    Emulsion polymerization of styrene with a nonionic emulsifier (polyoxyethylene nonylphenyl ether, E911) and potassium persulfate as initiator was carried out at different stirring rates (240-500 rpm) at 70 degrees C, which was started by the addition of initiator after stirring for 100 min at 70 degrees C. Resulting polystyrene (PS) particles at 240 rpm were 70-nm-sized, spherical particles and incorporated only 5 wt.% of total E911. On the other hand, particles at 500 rpm were 1-mu m-sized, nonspherical particles, which were formed by coagulation of small particles, and incorporated above 70 wt.% of E911 in the inside. Before starting emulsion polymerization, E911 and styrene, respectively, transferred from an aqueous phase to a styrene phase and from the styrene phase to the aqueous phase (water and micelles) faster at 500 rpm than 240 rpm. At 240 rpm, there were a lot of almost empty micelles (ca. 5 nm) in the aqueous phase, on the other hand at 500 rpm, 70 wt.% of total E911 transferred to the styrene phase and the micelles were swollen with much monomer (ca. 40 nm) even if the number was smaller. Stirring prior to starting the emulsion polymerization greatly affected partitionings of monomer to the aqueous phase and the nonionic emulsifier to the styrene phase, resulting in the differences in the particle formation and the incorporation of the nonionic emulsifier inside PS particles.
    SPRINGER, Apr. 2012, COLLOID AND POLYMER SCIENCE, 290(6) (6), 561 - 567, English
    [Refereed]
    Scientific journal

  • Hirotaka Moribe, Yukiya Kitayama, Toyoko Suzuki, Masayoshi Okubo
    Particle formation during the initial stages of emulsifier-free organotellurium-mediated living radical emulsion polymerization (emulsion TERP) of styrene at 60 degrees C was investigated at two stirring rates (220 and 1000 r.p.m.), in which the styrene phase floated as a layer on an aqueous phase at 220 r.p.m. or became dispersed as droplets at 1000 r.p.m. A water-soluble TERP agent, poly(methacrylic acid) (PMAA)-methyltellanyl (PMAA(30)-TeMe) and a water-soluble thermal initiator, 4,4'-azobis(4-cyanovaleric acid), at alkaline pH were used. The control/livingness was better at 1000 r.p.m. than at 220 r.p.m., and the particle size distribution was also affected by the stirring rate: both nanometer-sized and submicrometer-sized particles were observed at 220 r.p.m., and mainly nanometer-sized particles were observed at 1000 r.p.m. Because the percentage of PMAA(30)-TeMe consumed in the initial stage was much higher at 1000 r.p.m. than at 220 r.p.m., self-assembly nucleation preferentially occurred at 1000 r.p.m., resulting in nanometer-sized particles and good control/livingness. Stirring at 1000 r.p.m. only in the initial stage of the emulsion TERP followed by 220 r.p.m. induced good control/livingness and the formation of mainly nanometer-sized particles. It is concluded that a high stirring rate in the initial stage is important for the emulsion TERP of styrene to obtain good control/livingness and to control the particle formation mechanism. Polymer Journal (2012) 44, 205-210; doi:10.1038/pj.2011.115; published online 30 November 2011
    NATURE PUBLISHING GROUP, Mar. 2012, POLYMER JOURNAL, 44(3) (3), 205 - 210, English
    [Refereed]
    Scientific journal

  • Hirotaka Moribe, Yukiya Kitayama, Toyoko Suzuki, Masayoshi Okubo
    The effect of stirring rate on control/livingness and particle formation in emulsifier-free organotellurium-mediated living radical emulsion polymerization (emulsion TERP) of styrene at 60 degrees C was investigated at two stirring rates (220 and 1000 rpm), in which styrene phase floated as a layer on an aqueous phase at 220 rpm or dispersed as droplets at 1000 rpm. A water-soluble TERP agent, poly(methacrylic acid) (PMAA)-methyltellanyl (PMAA(30)-TeMe) (degree of polymerization of PMAA, 30), and a water-soluble thermal initiator, 4,4'-azobis(4-cyanovaleric acid), at high pH were used. The polymerization rate was not affected by the stirring rate, but the control/livingness was significantly improved when the stirring rate was increased from 220 to 1000 rpm. This difference would be caused by a larger amount of consumed PMAA(30)-TeMe in the aqueous phase and higher monomer concentration inside polymerizing particles as polymerization loci at 1000 rpm than at 220 rpm. The stirring rate also affected the particle size distribution: both nanometer-sized and submicrometer-sized particles were prepared at 220 rpm, and mainly nanometer-sized particles were prepared at 1000 rpm. From these results, it is concluded that the stirring rate is an important parameter in emulsion TERP to obtain good control/livingness and control particle formation.
    AMER CHEMICAL SOC, Jan. 2011, MACROMOLECULES, 44(2) (2), 263 - 268, English
    [Refereed]
    Scientific journal

  • Li Haipu, Toyoko Suzuki, Masayoshi Okubo
    Emulsion copolymerization of styrene and methacrylic acid with nonionic emulsifier and potassium persulfate as initiator gave nonspherical copolymer particles having uneven surface. The formation was based on the coagulation of byproduct nano-sized (ca. 35 nm) particles, which were formed throughout the copolymerization until monomer phase disappeared, onto main submicron-sized (234 similar to 445 nm) particles.
    WILEY-V C H VERLAG GMBH, 2010, MACROMOLECULAR SYMPOSIA, 288, 33 - 40, English
    [Refereed]
    International conference proceedings

  • Li Hai-pu, M. Okubo, T. Suzuki
    Hollow particles were prepared by the treatment of styrene-methacrylic acid copolymer particles with alkali/cooling method. The influences of stirring position (in aqueous phase or at the interface of O/W) and stirring speed (90, 110 and 240 r/min) on the formation of hollow particles were investigated. It is found that the soft stirring in aqueous phase at 90 r/min leads to the formation of monohollow particles, while the violent stirring at the interface of O/W and 240 r/min gives non-hollow products. In contrast, the weak stirring in aqueous phase at 110 r/min results in sterically heterogeneous dispersion of methacrylic acid-rich regions within the original particles, and hence the formation of multihollow particles. Further investigation indicates that the change of stirring efficiency provides a way to tune the diffusion behavior of monomer styrene, and therefore influences the distribution of methacrylic acid units in the original particles as well as the morphology of the treated particles.
    JOURNAL OF CENTRAL SOUTH UNIV TECHNOLOGY, Aug. 2009, JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY, 16(4) (4), 563 - 568, English
    [Refereed]
    Scientific journal

  • Preeyaporn Chaiyasat, Toyoko Suzuki, Hideto Minami, Masayoshi Okubo
    The thermal properties of n-hexadecane (HD) encapsulated in crosslinked capsule particles containing a water and/or air domain were studied from the viewpoint of heat-storage applications. The capsule particles were prepared by the microsuspension polymerization of divinylbenzene at 70 degrees C with the self-assembling of phase-separated polymer method that we developed. In the differential scanning calorimetric thermograms, pure HD had a single solidification temperature (T-s) peak at 15 degrees C, whereas the encapsulated HD containing a water domain had two peaks at 6 and 1 degrees C. That is, the encapsulated HD containing the water domain required a longer time and lower temperature to complete the solidification than pure HD, which was negative for heat-storage applications. However, once the particles were dried and the water domain was replaced with air, the problem with the partially lowered T, improved. The air domain was also found in the encapsulated HD core after solidification because of the shrinkage of HD. The presence of the air domain did not affect the thermal stability of the encapsulated HD. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 3257-3266, 2009
    WILEY, Jun. 2009, JOURNAL OF APPLIED POLYMER SCIENCE, 112(6) (6), 3257 - 3266, English
    [Refereed]
    Scientific journal

  • Hiroshi Kobayashi, Toyoko Suzuki, Mineho Moritaka, Emi Miyanaga, Masayoshi Okubo
    Seeded emulsion polymerizations of styrene using polystyrene (PS) seed particles with incorporated nonionic emulsifier were carried out at 40 and 70 A degrees C to investigate the influence of temperature during the polymerization process including the swelling step of the seed particles with monomer on the formation of multihollow PS particles. An increase in the temperature during the polymerization process caused an increase in the rate of coalescence (i.e., the degree of coalescence at any given time) of the small water domains in the inside. After the coalescence proceeded excessively, the water domains were eventually discharged from the particles to the medium, resulting in nonhollow particles. The results show that it is important for the preparation of the multihollow PS particles to control the coalescence of a lot of small water domains inside the seed particles with the incorporated nonionic emulsifier, and strongly support the formation mechanism previously proposed.
    SPRINGER, Mar. 2009, COLLOID AND POLYMER SCIENCE, 287(3) (3), 251 - 257, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Toyoko Suzuki, Miyuki Yanagisawa, Masayoshi Okubo
    A novel quantitative method using isothermal titration calorimeter (ITC) for the estimation of the distribution of carboxyl groups within polymer particles has been proposed. The method has been employed to clarify the difference in the distribution between the particles prepared by batch emulsion copolymerization of styrene and methacrylic acid under inefficient and efficient stirring conditions. At inefficient stirring, monomer was floating as a layer on the aqueous medium, whereas at efficient stirring, the monomer phase was dispersed as droplets. Under inefficient stirring, methacrylic acid (MAA) polymerized faster than styrene (S) due to a slower diffusion rate of S than MAA into the aqueous medium, while under efficient stirring, S and MAA copolymerized at similar rates. ITC measurement showed that under inefficient stirring, the carboxyl groups were distributed mainly in the center of the particles, and their number decreased toward the surface. On the other hand, under efficient stirring, carboxyl groups were distributed homogeneously inside the particle.
    WILEY-V C H VERLAG GMBH, 2009, MACROMOLECULAR SYMPOSIA, 281, 135 - 141, English
    [Refereed]
    International conference proceedings

  • Hiroshi Kobayashi, Amorn Chaiyasat, Yoshiteru Oshima, Toyoko Suzuki, Masayoshi Okubo
    The influence of the methacrylic acid (MAA) content (0-10 mol %) on the incorporation of polyoxyethylene nonylphenyl ether (Emulgen 911, HLB 13.7) nonionic emulsifier inside polymer particles during emulsion copolymerization of styrene (S) and MAA was investigated. The amount of incorporated emulsifier after centrifugal washing with 2-propanol to remove adsorbed emulsifier from the surfaces was directly measured by gel permeation chromatography (GPC) and H-1 NMR. The level of incorporation increased with increasing MAA content and reached 74% of the total amount of emulsifier at 10 mol % MAA. At lower MAA contents (0-3 mol %), the particle size distribution was bimodal because of formation of new particles by secondary nucleation. However, only limited secondary nucleation occurred at higher MAA contents (6-10 mol %), and monodisperse particles were thus obtained.
    AMER CHEMICAL SOC, Jan. 2009, LANGMUIR, 25(1) (1), 101 - 106, English
    [Refereed]
    Scientific journal

  • Yuko Hata, Toyoko Suzuki, Hideto Minami, Masayoshi Okubo
    Hollow polymer particles with multiple holes in the shell were prepared by aqueous microsuspension polymerization of micrometer-sized, monodisperse divinyl-benzene/n-hexadecane droplets in the presence of sodium dodecyl sulfate (SDS) at concentrations above 4 mM utilizing the Self-assembling Phase-Separated Polymer (SaPSeP) method developed by the authors. The total surface area of the holes per particle increased with an increase in the SDS concentration. At [SDS] = 10 mM, "flower-like" non-spherical particles were formed.
    SPRINGER, Nov. 2008, COLLOID AND POLYMER SCIENCE, 286(13) (13), 1561 - 1567, English
    [Refereed]
    Scientific journal

  • SUZUKI Toyoko
    The Adhesion Society of Japan, Aug. 2008, Journal of The Adhesion Society of Japan, 44(8) (8), 307 - 312, Japanese

  • Amorn Chaiyasat, Masahiro Yamada, Hiroshi Kobayashi, Toyoko Suzuki, Masayoshi Okubo
    Emulsion copolymerizations of styrene and methacrylic acid with polyoxyethylene nonylphenyl ether nonionic emulsifiers having various hydrophilic-lipophilic balance (HLB) values (13.7, Emulgen 911; 15.5, Emulgen 920; 17.2, Emulgen 931) were performed. The incorporation behavior of the nonionic emulsifiers, comprising polydisperse poly(ethylene oxide) (PEO) chain lengths, inside the particles was investigated. At the completion of the polymerization, the incorporated percentage of the lowest HLB emulsifier was 61%, much higher than that of the highest HLB one (10%). In both polymerizations, the amounts of the incorporated emulsifiers increased with conversion, and shorter PEO chain (i.e., lower molecular weight) components were predominantly incorporated over longer PEO chain components. (c) 2008 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Jun. 2008, POLYMER, 49(13-14) (13-14), 3042 - 3047, English
    [Refereed]
    Scientific journal

  • Preeyaporn Chaiyasat, Yumiko Ogino, Toyoko Suzuki, Masayoshi Okubo
    The influence of a water domain formed in n-hexadecane (HD) core in cross-linked polymer capsule particles on the thermal properties of encapsulated HD was studied from the view point of heat storage application. The capsule particles were prepared by micro-suspension polymerization of divinylbenzene at 70 degrees C utilizing the Self-assembling of Phase-Separated Polymer (SaPSeP) method that the authors proposed. The water domain was not observed for particles taken just after the polymerization and kept at 70 C, but it was gradually formed with an increase of the size during cooling process from 70 degrees C to room temperature. In differential scanning calorimetric thermograms, pure HD had a single peak because of solidification (T-s) at 15 degrees C, and the encapsulated HD containing the water domain had two peaks of T-s1 and T-s2, at 6 and 1 degrees C, respectively. That is, the encapsulated HD containing the water domain required longer time and lower temperature to complete the solidification than the pure HD, which is negative for its application. However, the lower temperature-side peak at T (s2) gradually disappeared with an increase of capsule particle diameter, which seems to be based on the decrease of total interfacial area between the water domains and encapsulated HD in the capsule particles.
    SPRINGER, Jun. 2008, COLLOID AND POLYMER SCIENCE, 286(6-7) (6-7), 753 - 759, English
    [Refereed]
    Scientific journal

  • Preeyaporn Chaiyasat, Yumiko Ogino, Toyoko Suzuki, Hideto Minami, Masayoshi Okubo
    From the viewpoint of heat storage application, encapsulation of n-hexadecane (HD) was carried out by microsuspension copolymerizations of divinylbenzene (DVB) and acrylic monomers (butyl acrylate, BA; ethyl acrylate, EA) utilizing the self-assembling of phase-separated polymer (SaPSeP) method proposed by the authors. The heat of solidification (H-s) of encapsulated HD in the micron-sized, cross-linked particles was determined by the differential scanning calorimeter (DSC). H-s of the encapsulated HD in poly(DVB) particles was much lower than that of pure HD, but it was increased with BA or EA content copolymerized up to that of pure HD. Such an influence of encapsulation on the H-s was discussed.
    SPRINGER, Feb. 2008, COLLOID AND POLYMER SCIENCE, 286(2) (2), 217 - 223, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Masayoshi Okubo, Amorn Chaiyasat, Masahiro Yamada, Toyoko Suzuki, Hiroshi Kobayashi
    Emulsion copolymerizations of styrene and methacrylic acid (MAA) with various nonionic emulsifiers having a hydrophilic-lipophilic balance (HLB) range of 13.7-17.2 were performed to clarify the influence of emulsification state on polymerization. The emulsification state with a lower-HLB value emulsifier was worse than that with a higher one. In the lowest HLB value, MAA was predominantly polymerized over styrene in the early stage of the copolymerization, resulting in predominant ( heterogeneous) distribution of MAA units in the inside of the final polymer particles. In the higher-HLB emulsifiers, styrene and MAA were simultaneously copolymerized, resulting in a homogeneous MAA distribution. The percentage of incorporation of the nonionic emulsifier inside the particles was the highest (49% based on the total amount of the emulsifier) in the lowest HLB, whereas it was 1% in the highest HLB.
    SPRINGER, Dec. 2007, COLLOID AND POLYMER SCIENCE, 285(15) (15), 1755 - 1761, English
    [Refereed]
    Scientific journal

  • Takuya Tanaka, Toyoko Suzuki, Yuichi Saka, Per B. Zetterlund, Masayoshi Okubo
    The compressive strengths of micron-sized, cross-linked poly(styrene-divinylbenzene) particles synthesized by conventional radical copolymerization (70 degrees C and nitroxide (TEMPO) -mediated radical copolymerization (125 degrees C in aqueous micro-suspension have been measured. In the conventional system, the breaking energies and the compressive strengths of the particles (after removal of unreacted monomer) remained approximately constant from low to high conversion, whereas in the NMP system, both quantities increased close to linearly with conversion. The results suggest that the network formation is more homogeneous in the NMP system than in the conventional system. (c) 2007 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Jun. 2007, POLYMER, 48(13) (13), 3836 - 3843, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yumiko Ogino, Toyoko Suzuki, Masayoshi Okubo
    Poly (divinylbenzene) (PDVB) particles with encapsulated n-hexadecane (HD) were prepared by micro-suspension polymerization using the "self-assembling of phase separated polymer (SaPSeP) " method proposed by the present authors. The degree of supercooling (Delta T-s) and the heat of solidification (H-s) of HD in the capsule particles were determined by differential scanning calorimeter (DSC) using aqueous dispersions. The supercooling and marked decreasing of H-s of HD in the capsule particles were observed. The influence of the size and hydrophilicity of the capsule, on Delta T-s and H-s of encapsulated HD was discussed.
    SOC POLYMER SCIENCE JAPAN, 2007, KOBUNSHI RONBUNSHU, 64(3) (3), 171 - 176, Japanese
    [Refereed]
    Scientific journal

  • Emulsion polymerization with amphiphilic block copolymer as polymeric emulsifier prepared by two-step ATRP in aqueous heterogeneous media
    OKUBO Masayoshi, KAGAWA Yasuyuki, SANO Yuka, SUZUKI Toyoko
    2007, Polymeric Microsphere (Kyoto University Press), 31-46, English
    Scientific journal

  • Masayoshi Okubo, Toyoko Suzuki, Naoki Tsuda
    A novel technique to estimate the distribution state of carboxyl groups within submicron-sized, carboxylated polymer particles was proposed. For the purpose, carboxyl groups in two kinds of butyl methacrylate-methacrylic acid copolymer emulsion, which were prepared by emulsion copolymerizations with different monomer addition methods, were titrated by isothermal titration calorimetry with an extremely small amount (ca. 2 mg) of the particles.
    SPRINGER, Aug. 2006, COLLOID AND POLYMER SCIENCE, 284(11) (11), 1319 - 1323, English
    [Refereed]
    Scientific journal

  • Toyoko Suzuki, Mayuko Inoue, Masayoshi Okubo
    Glass transition temperature (Tg) of submicron-sized, carboxylated polymer particles dispersed in aqueous media, which were prepared by emulsion copolymerization of styrene, iso-butyl methacrylate, or methyl methacrylate with methacrylic acid, was measured at alkali or acidic pH region with a power compensation-type high sensitive differential scanning calorimeter. The Tg of relatively hydrophilic polymer particles was obviously decreased by the neutralization of the carboxyl groups with KOH, whereas that of hydrophobic polymer particles was not changed though water was absorbed therein. These results indicate that water absorption state, which means not only the amount of water absorption but also the heterogeneity of the ionized carboxylated polymer particles, markedly depends on the hydrophilicity of their base polymers. This strongly supports the formation mechanism of multihollow particles by the stepwise alkali/acid or the alkali/cooling treatments of carboxylated polymer particles proposed by the authors.
    SPRINGER, Apr. 2006, COLLOID AND POLYMER SCIENCE, 284(7) (7), 802 - 806, English
    [Refereed]
    Scientific journal

  • Effect of stirring on incorporation of nonionic emulsifier inside poly(styrene-methacrylic acid) particles
    Maiko Murai, Hiroshi Kobayashi, Masahiro Yamada, Toyoko Suzuki, Masayoshi Okubo
    The incorporation behavior of nonionic emulsifier inside carboxylated polymer particles in emulsion copolymerization of styrene and methacrylic acid was studied using Emulgen 911 (polyoxyethylene nonyl phenyl ether). Batchwise copolymerizations were carried out using different stirring modes. The level of incorporation of emulsifier was quantified using GPC with refractive index detection, and the particle size distributions were studied by TEM. The mode of stirring markedly influenced the occurrence of secondary nucleation and the amount of incorporation.
    2006, Polymer Preprints, Japan, 55(1) (1), 488, Japanese
    International conference proceedings

  • Preparation of cross-linked polymer particles encapsulating n-hexadecane by SaPSeP method
    Toyoko Suzuki, Hideto Minami, Yumiko Ogino, Masayoshi Okubo
    Recently, we proposed the technique to prepare about micron-sized, monodisperse, cross-linked polymer particles having one hollow by suspension polymerization for DVB/toluene droplets dissolving polystyrene (PS) and benzoyl peroxide, and suggested the formation mechanism. When the droplets did not contain PS, no hollow particle was obtained. The polymer dissolved in the droplets was needed to promote phase separation of PDVB prepared during the polymerization. The method is named the "self assembling of phase separation polymer (SaPSeP)" method. Moreover, hollow particles were obtained with no PS using nonsolvent of PDVB, ex. n-hexadecane, in place of toluene. In a series of this study, the PDVB/HD particles having a water-domain were observed. In this research, in order to clarify the diffusion mechanism of water and formation mechanism more in detail, we will try to produce PDVB/HD particles having hollow structure by SaPSeP method.
    2005, Polymer Preprints, Japan, 54(1) (1), 1083, Japanese
    International conference proceedings

  • M Okubo, M Inoue, T Suzuki, M Kouda
    The glass transition temperatures (Tg) of three kinds of poly(methyl methacrylate)-based copolymer emulsions having wide polymer compositions, which were prepared by emulsifier-free emulsion copolymerizations of methyl methacryalate with ethyl acrylate, n-buthyl methacrylate and methacrylic acid, were measured with a power compensation-type highly sensitive differential scanning calorimeter. The Tg values of the copolymers in their emulsion state (Tg(E)) were always lower than those in their dry states (Tg(D)), and the difference between Tg(E) and Tg(D) increased with an increase in copolymer hydrophilicities.
    SPRINGER, Aug. 2004, COLLOID AND POLYMER SCIENCE, 282(10) (10), 1150 - 1154, English
    [Refereed]
    Scientific journal

  • Estimation of heterogeneous surface structure of blend polymer film consisting of hydrophobic and hydrophilic polymers in water by atomic force microscope
    M Okubo, T Suzuki, Y Fukuhara
    Surface structures of films cast from pyridine solutions of polystyrene (PS), poly(2-hydroxyethyl methacrylate) (PHEMA), and their mixture (PS/PHEMA = 1/1, w/w) in air and water were examined with atomic force microscopy (AFM) using force volume mode. The AFM measurement was a useful tool to clarify that the PS/PHEMA blend film in water had a heterogeneous surface consisting of a hard PS matrix and soft PHEMA domains.
    SPRINGER-VERLAG BERLIN, 2004, AQUEOUS POLYMER DISPERSIONS, 124, 94 - 97, English
    [Refereed]
    International conference proceedings

  • M Okubo, T Suzuki, Y Fukuhara
    Surface structure of submicron-sized poly(styrene/2-hydroxyethyl methacrylate) [P(S/HEMA)] composite particles produced by emulsifier-free emulsion polymerization was estimated with atomic force microscopy (AFM). AFM force curves were measured in water at different points of the particle surface; it was clarified that the particle surface had a heterogeneous structure consisting of hard and soft parts, which must be, respectively, based on styrene-rich and 2-hydroxyethyl methacrylate-rich parts.
    SPRINGER-VERLAG, Jun. 2003, COLLOID AND POLYMER SCIENCE, 281(6) (6), 569 - 574, English
    [Refereed]
    Scientific journal

  • M Okubo, A Ito, H Mori, T Suzuki
    Cationic nanoparticles were prepared from submicron-sized styrene-butyl acrylate-dimethylaminoethyl methacrylate terpolymer (59.2/20.8/20.0, molar ratio) particles in a polyoxyethylene nonylphenylether nonionic emulsifier aqueous solution at pH 2.0 above 150 degreesC.
    SPRINGER-VERLAG, Feb. 2003, COLLOID AND POLYMER SCIENCE, 281(2) (2), 168 - 172, English
    [Refereed]
    Scientific journal

  • M Okubo, T Suzuki, R Shinohara, N Fukami
    The adsorption behavior of poly(oxyethylene) nonyl phenyl ether nonionic emulsifier molecules onto polystyrene (PS) and styrene-methacrylic acid copolymer [P(SMAA)] particles dispersed in D2O was evaluated by in situ H-1 NMR measurements at room temperature. The resonance due to the protons of the emulsifier molecules was only observed. Normalized NMR integrals of the resonance due to the protons of hydrophobic groups (nonyl and phenyl groups) and the hydrophilic group, poly(oxyethylene) chain, at a certain concentration of the emulsifier decreased with an increase in the total surface area of the PS particles dispersed in the system. The decrease for the hydrophobic groups was much larger than that for the hydrophilic groups. In the dispersion system of P(S-MAA) particles, ionized carboxyl groups at the particle surface decreased the amount of the emulsifier adsorbed.
    SPRINGER-VERLAG, Nov. 2002, COLLOID AND POLYMER SCIENCE, 280(11) (11), 1053 - 1056, English
    [Refereed]
    Scientific journal

  • M Okubo, A Ito, N Okada, T Suzuki
    The variation of the morphology of a carboxylated polymer film cast from tetrahydrofuran solution, in which styrene/methacrylic acid copolymer particles produced by emulsion copolymerization were dissolved, before and after alkali treatment at temperatures higher than the glass-transition temperature was observed with a scanning electron microscope. The treated film had a porous structure. This result provides important evidence for the formation mechanism of the multihollow structure in submicron-sized, carboxylated polymer emulsion particles by the stepwise alkali/acid method and the alkali/cooling method which the authors proposed.
    SPRINGER-VERLAG, Jun. 2002, COLLOID AND POLYMER SCIENCE, 280(6) (6), 574 - 578, English
    [Refereed]
    Scientific journal

  • The acceleration behavior of decomposition of potassium persulfate in the dispersions of polystyrene particles stabilized with nonionic emulsifier
    OKUBO Masayoshi, TASAKI Satoshi, SUZUKI Toyoko
    2001, Proceedings of the International Conference on COLLOID and SURF. SCI. (Tokyo, 2000), Vol. 132, pp. 347-350, English
    [Refereed]
    International conference proceedings

  • Microanalysis of the surface concentration of sulfate groups at polystyrene particle by isothermal titration calorimetry
    M Okubo, T Suzuki, A Sakauchi
    Microanalysis of sulfate groups at polystyrene particle surfaces, which were derived as persulfate initiator fragments, was carried out with isothermal titration calorimetry, and compared with a conventional conductometric titration. The quantitative analysis was possible even with an extremely small number of polystyrene particles have 10 mu mol sulfate groups.
    SPRINGER VERLAG, Jun. 1999, COLLOID AND POLYMER SCIENCE, 277(6) (6), 579 - 582, English
    [Refereed]
    Scientific journal

  • Synthesis of temperature sensitive micron sized monodispersed composite polymer particles and its application as a carrier for biomolecules
    M Okubo, H Ahmad, T Suzuki
    Temperature-sensitive micron-sized monodispersed composite polymer particles were prepared by seeded copolymerization of dimethylaminoethyl methacrylate and ethylene glycol dimethacrylate with 1.77 mu m-sized monodispersed polystyrene seed particles. The change in surface property at temperature above and below 35 degrees C was examined by differential scanning calorimetry, trypsin activity and the adsorption/desorption behaviors of low molecular weight cationic emulsifier as well as biomolecules.
    SPRINGER VERLAG, Jun. 1998, COLLOID AND POLYMER SCIENCE, 276(6) (6), 470 - 475, English
    [Refereed]
    Scientific journal

  • Production of micron sized monodispersed composite polymer particles by seeded polymerization utilizing the dynamic swelling method
    M Okubo, T Yamashita, T Suzuki, T Shimizu
    In order to develop the seeded polymerization technique utilizing the dynamic swelling method (DSM) proposed by authors for the production of micron-sized monodispersed ''composite'' polymer particles consisting of two kinds of polymers, the seeded polymerization for the dispersion of ethyl methacrylate (EMA)-swollen PS particles prepared utilizing DSM was carried out. Monodispersed PS/poly(ethyl methacrylate) (PEMA) composite particles having 7 mu m in diameter were produced by the addition of NaCl to lower the solubility of EMA in medium and by the addition of CuCl2 as a water-soluble inhibitor to depress the by-production of submicron-sized PEMA particles.
    DR DIETRICH STEINKOPFF VERLAG, Mar. 1997, COLLOID AND POLYMER SCIENCE, 275(3) (3), 288 - 292, English
    [Refereed]
    Scientific journal

■ MISC
  • 自立型感温性を示すイオン液体含有複合高分子ゲル微粒子の合成
    鈴木登代子, 南 秀人
    Lead, Mar. 2020, PHAM TECH JAPAN, (9) (9), 177 - 181, Japanese
    [Invited]
    Introduction scientific journal

  • Preparation of Anomalous Gels Including Cellulose Nanocrystals Utilizing Composed Droplets
    鈴木 登代子
    シーエムシー出版, Mar. 2019, ファインケミカル : 調査・資料・報道・抄録, 48(3) (3), 18 - 24, Japanese

  • MINAMI Hideto, LI Wei, SUZUKI Toyoko

    A facile and novel approach of preparing monodisperse polystyrene (PS) particles having a "cylindrical" shape was discovered. The proposed synthetic method involved dispersion polymerization of the spherical PS particles stirred in a polyvinylpyrrolidone (PVP) aqueous solution for several hours using a magnetic stirrer. In the presence of PVP, the spherical PS particles deformed into cylindrical shapes following stirring; however, the particles did not deform in the absence of PVP. The deformation rate of the particles was affected by the molecular weight of dissolved PVP. This stirring method is not only highly efficient and provides high yield, but is also applicable to other materials such as polymethyl methacrylate (PMMA). Moreover, cylindrical polystyrene particles were applied as a particulate stabilizer to prepare a Pickering emulsion of decane (oil)/water. Unlike the spherical particles that are typically used in Pickering emulsions, the cylindrical particles enhanced the emulsion's stability (up to 1 year). Furthermore, the cylindrical particulate stabilizer enabled a stable emulsion across a wide range of pH. Notably, unique adsorption behavior of the cylindrical particles on an oil droplet was observed, in which the cylindrical particles connected head to head to form a network that acted as a cage around the oil droplet.

    Japan Society of Colour Material, 2019, Journal of the Japan Society of Colour Material, 92(10) (10), 299 - 303, Japanese
    Introduction scientific journal

  • 階層構造制御による高分子微粒子の機能化
    MINAMI Hideto, SUZUKI Toyoko
    2014, PHARM TECH JAPAN, 30(14) (14), 133 - 138, Japanese
    [Invited]
    Introduction scientific journal

  • 超臨界二酸化炭素流体中での高分子(微粒子)の合成
    OKUBO Masayoshi, MINAMI Hideto, SUZUKI Toyoko
    Jul. 2010, 日本接着学会誌, Vol 46, ,No.8, pp. 276-281, Japanese
    Report scientific journal

  • Amorn Chaiyasat, Masahiro Yamada, Hiroshi Kobayashi, Toyoko Suzuki, Masayoshi Okubo
    ELSEVIER SCI LTD, Aug. 2008, POLYMER, 49(17) (17), 3838 - 3838, English
    [Refereed]
    Others

  • Studies on Characterizations of Submicron-sized Polymer Particles with Instrumental Analysis
    SUZUKI Toyoko
    15 Jun. 2007, 日本接着学会年次大会講演要旨集, 45, 109 - 112, Japanese

  • Effect of stirring on incorporation of nonionic emulsifier inside polymer particles in emulsion copolymerization of styrene and methacrylic acid
    MURAI Maiko, KOBAYASHI Hiroshi, SUZUKI Toyoko, OKUBO Masayoshi
    15 Jun. 2007, 日本接着学会年次大会講演要旨集, 45, 35 - 36, Japanese

  • The wet adhesion of emulsion film that ethyleneurea groups localize at the surface
    OKUBO Masayoshi, KAGAWA Yasuyuki, MATSUDA Mitsuo, TERADA Akinori, SUZUKI Toyoko
    26 Jun. 2003, 日本接着学会年次大会講演要旨集, 41, 57 - 58, Japanese

  • Estimation of heterogeneous surface structure of composite particle consisting of hydrophobic and hydrophilic polymers by atomic force microscopy
    OKUBO Masayoshi, SUZUKI Toyoko, FURUHARA Yasuhiro
    22 Jul. 2002, 日本接着学会年次大会講演要旨集, 40, 37 - 38, Japanese

  • Nano-DSC analysis of enthalpy relaxation of poly(i-butyl methacrylate) within particle dispersed in water
    OKUBO Masayoshi, KOUDA Masaya, SUZUKI Toyoko
    22 Jul. 2002, 日本接着学会年次大会講演要旨集, 40, 65 - 66, Japanese

  • Influence of addition methods of unsaturated acid monomer in emulsion polymerization on the distribution of carboxyl groups within polymer particle
    OKUBO Masayoshi, TSUDA Naoki, SUZUKI Toyoko
    22 Jul. 2002, 日本接着学会年次大会講演要旨集, 40, 39 - 40, Japanese

  • Estimation for Distribution of Carboxyl Groups within Polymer Particles by Isothermal Titration Calorimeter
    OKUBO Masayoshi, SUZUKI Toyoko, TSUDA Naoki
    05 Jul. 2001, 日本接着学会年次大会講演要旨集, 39, 37 - 38, Japanese

  • Estimation of glass transition temperature of polymer particle dispersed in water using a Nano-DSC
    OKUBO Masayoshi, KOUDA Masaya, FURUKAWA Yoshio, SUZUKI Toyoko
    05 Jul. 2001, 日本接着学会年次大会講演要旨集, 39, 35 - 36, Japanese

  • Absorption Behavior of Nonionic Emulsifier Molecules onto Polymer Particle surfaces by ^1H-NMR
    OKUBO Masayoshi, SHINOHARA Reiko, SUZUKI Toyoko
    25 Jun. 1999, 日本接着学会年次大会講演要旨集, 37, 93 - 94, Japanese

■ Books And Other Publications
  • ファインケミカル特集：ヤヌス粒子の設計最前線「ヤヌス（複合）液滴を用いたセルロースナノクリスタル異形ゲルの作製」
    SUZUKI Toyoko
    Single work, 株式会社シーエムシー, Mar. 2019, Japanese, 概要
    Scholarly book

  • エマルションの特性評価と新製品開発、品質管理への活用
    MINAMI Hideto, SUZUKI Toyoko
    Joint work, 株式会社技術情報協会, Oct. 2014, Japanese, ISBN: 9784861045462
    Scholarly book

  • Emulsion Polymerization and Functional Polymeric Microspheres –Science and Technology- Chapter 4“Glass transition temperatures of polymer particles with incorporated nonionic emulsifier prepared by emulsion polymerizations in emulsion and dry states”
    CHAIYASAT Amorn, CHAIYASAT Preyapoon, SUZUKI TOYOKO, MINAMI HIDETO, OKUBO Masayoshi
    Joint work, Yonsei University Press, Oct. 2013, English, ISBN: 9788968500442
    Scholarly book

■ Lectures, oral presentations, etc.
  • 銀ナノ粒子を含有したセルロース粒子の作製
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    IUPAC MACRO2018, Mar. 2020, Japanese, IUPAC, Cairns, Australia, Domestic conference
    Oral presentation

  • Morphology Control of Cellulose Particles
    OMURA Taro, SUZUKI Toyoko, MINAMI Hideto
    2nd G'L'owing Polymer Symposium in KANTO, Nov. 2019, English, 日本化学会, 神戸, Japan, International conference
    Oral presentation

  • Synthesis of Poly(ionic liquid) and Application to an Adhesive
    TSUKIJI Junichi, NAKANO Takanori, HAYASHI Chihiro, SUZUKI Toyoko, MINAMI Hideto
    第99回日本化学会春季年会, Nov. 2019, Japanese, 日本化学会, 神戸, Domestic conference
    Poster presentation

  • Two-Dimensional Colloidal Structure Utilizing Disc-like Particles
    FUJII Mana, TSUKIJI Junichi, NAKANO Takanori, SUZUKI Toyoko, MINAMI Hideto
    1st G'L'owing Polymer Symposium in KANTO, Oct. 2019, Japanese, 高分子学会関東支部, 東京, Japan, Domestic conference
    Poster presentation

  • Preparation of Cylindrical PS/P(S-MMA) Janus Particles by Stirring Method
    ONISHI Miku, TSUJITA Daiki, LI Wei, SUZUKI Toyoko, MINAMI Hideto
    2th SPSJ International Polymer Conference (IPC2018), Oct. 2019, Japanese, 高分子学会, 広島, Japan, Domestic conference
    Poster presentation

  • Morphology Control of Janus Particles and Colloidal Structure Utilizing Hydrogen Bonding Interactions
    TSUJITA Daiki, MIZUHARA Syuichiro, OMURA Taro, SUZUKI Toyoko, MINAMI Hideto
    第27回ポリマー材料フォーラム, Sep. 2019, Japanese, 高分子学会, 東京, Japan, Domestic conference
    Oral presentation

  • Preparation of silicone/polymer composite particles
    MUKAI Ken, FUJII Yuki, YAMANE Mitsuyoshi, SUZUKI Toyoko, MINAMI Hideto
    2th SPSJ International Polymer Conference (IPC2018), Sep. 2019, Japanese, 高分子学会, 広島, Japan, Domestic conference
    Poster presentation

  • Influence of Precipitation Solvent on Morphology of Cellulose Particles by Solvent Releasing Method
    OMURA Taro, SUZUKI Toyoko, MINAMI Hideto
    1st G'L'owing Polymer Symposium in KANTO, Sep. 2019, Japanese, 高分子学会関東支部, 東京, Domestic conference
    Poster presentation

  • Preparation of silicone/polymer composite particles with various morphologies
    MUKAI Ken, FUJII Yuki, YAMANE Mitsuyoshi, SUZUKI Toyoko, MINAMI Hideto
    The International Polymer Colloid Group (IPCG) Conference 2019, Jun. 2019, English, International Polymer Colloids Group, Singapore, Singapore, International conference
    Poster presentation

  • Synthesis of Poly(ionic liquid) Particles and Application to a Metal-plastic Adhesive
    TSUKIJI Junichi, NAKANO Takanori, HAYASHI Chihiro, SUZUKI Toyoko, MINAMI Hideto
    The International Polymer Colloid Group (IPCG) Conference 2019, Jun. 2019, English, International Polymer Colloids Group, Singapore, Singapore, International conference
    Poster presentation

  • Preparation of Cylindrical Shape Particles
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    The International Polymer Colloid Group (IPCG) Conference 2019, Jun. 2019, English, International Polymer Colloids Group, Singapore, Singapore, International conference
    Poster presentation

  • Preparation of microcapsules with hemisphere silica particles
    SUZUKI Toyoko, ITO Mayu, MORI Atsunori, MINAMI Hideto
    The International Polymer Colloid Group (IPCG) Conference 2019, Jun. 2019, English, International Polymer Colloids Group, Singapore, Singapore, International conference
    Poster presentation

  • Effect of Kind of Precipitation Solvent on Morphology of Cellulose Particles
    OMURA Taro, SUZUKI Toyoko, MINAMI Hideto
    The International Polymer Colloid Group (IPCG) Conference 2019, Jun. 2019, English, International Polymer Colloids Group, Singapore, Singapore, International conference
    Poster presentation

  • Formation Mechanism of Cellulose Particles Having Hollow Structure
    OMURA Taro, SUZUKI Toyoko, MINAMI Hideto
    IUPAC MACRO2018, May 2019, English, IUPAC, Cairns, Australia, Domestic conference
    Oral presentation

  • ひとつのシリカ粒子を内包したカプセル粒子の作製
    MAEDA Takuro, Mori Atsunori, SUZUKI Toyoko
    第64回高分子研究発表会（神戸）, Jul. 2018, Japanese, 高分子学会関西支部, 神戸, Domestic conference
    Oral presentation

  • Preparation of Janus particles composed of hydrophobic and hydrophilic polymer
    MINAMI Hideto, OUCHI Takuto, NAKAMURA Ryuma, SUZUKI Toyoko
    IUPAC MACRO2018, Jul. 2018, English, IUPAC, Cairns, Australia, International conference
    Oral presentation

  • 棒状ポリスチレン粒子の作製とその界面吸着挙動
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    第67回高分子学会年次大会, May 2018, English, 高分子学会, 名古屋, Domestic conference
    Oral presentation

  • TEMPO酸化を利用した機能性セルロース粒子の作製
    FUJII Yuki, IMAGAWA Kaori, OMURA Taro, SUZUKI Toyoko, MINAMI Hideto
    第67回高分子学会年次大会, May 2018, Japanese, 高分子学会, 名古屋, Domestic conference
    Poster presentation

  • Application of Spongy Cellulose Particles to Encapsulation
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    The 6th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres, Mar. 2018, English, ASEPFPM, 福井, International conference
    Poster presentation

  • A Facile Method for Preparation of Monodisperse Cylindrical Polystyrene Particles
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    The 6th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres, Mar. 2018, English, ASEPFPM, 福井, International conference
    Poster presentation

  • 銀ナノ粒子を含有したセルロース粒子の作製
    FUJII Yuki, OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    2017年度色材研究発表会, Oct. 2017, Japanese, 色材協会, 東京, Domestic conference
    Poster presentation

  • 新規な単分散棒状粒子の作製
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会討論会, Sep. 2017, Japanese, 高分子学会, 愛媛, Domestic conference
    Poster presentation

  • 塩添加により開口部を形成するカプセル粒子の作製
    MIZUHARA Syuichiro, OUCHI Takuto, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会討論会, Sep. 2017, Japanese, 高分子学会, 愛媛, Domestic conference
    Oral presentation

  • セルロース/銀複合粒子の作製
    FUJII Yuki, OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会討論会, Sep. 2017, Japanese, 高分子学会, 愛媛, Domestic conference
    Poster presentation

  • アニオン交換を利用したポリイオン液体中空粒子の機能化
    HAYASHI Chihiro, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会討論会, Sep. 2017, Japanese, 高分子学会, 愛媛, Domestic conference
    Oral presentation

  • TEMPO酸化を利用したセルロース/銀複合粒子の作製
    FUJII Yuki, OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    第68回コロイドおよび界面化学討論会, Sep. 2017, Japanese, 日本化学会コロイドおよび界面化学部会, 神戸, Domestic conference
    Poster presentation

  • 金属酸化物を内包したポリイオン液体中空粒子の合成
    HAYASHI Chihiro, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第63回高分子研究発表会（神戸）, Jul. 2017, Japanese, 高分子学会関西支部, 神戸, Domestic conference
    Oral presentation

  • TEMPO酸化を利用したセルロース粒子の機能化
    FUJII Yuki, OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    第63回高分子研究発表会（神戸）, Jul. 2017, Japanese, 高分子学会関西支部, 神戸, Domestic conference
    Oral presentation

  • Preparation of Poly(ionic liquid) Hollow Particles with Switchable Permeability
    MINAMI Hideto, NAKAMURA Ryuma, TOKUDA Masayoshi, SUZUKI Toyoko
    The International Polymer Colloids Group Conference 2017, Jun. 2017, English, The International Polymer Colloids Group, Arantzazu, Spain, International conference
    Poster presentation

  • Encapsulatiion Strategy Using Spongy Cellulose Particles
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    The International Polymer Colloids Group Conference 2017, Jun. 2017, English, The International Polymer Colloids Group, Arantzazu, Spain, International conference
    Poster presentation

  • A Simple Method to Synthesize Monodisperse Cylindrical Particles by Polystyrene
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    The International Polymer Colloids Group Conference 2017, Jun. 2017, English, The International Polymer Colloids Group, Arantzazu, Spain, International conference
    Poster presentation

  • 単分散な棒状ポリスチレン粒子の作製
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会年次大会, May 2017, Japanese, 高分子学会, 千葉, Domestic conference
    Poster presentation

  • 多孔質構造セルロース粒子を利用したカプセル化
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会年次大会, May 2017, Japanese, 高分子学会, 千葉, Domestic conference
    Poster presentation

  • 塩刺激開口部を有するカプセル粒子の作製
    MIZUHARA Syuichiro, OUCHI Takuto, SUZUKI Toyoko, MINAMI Hideto
    第66回高分子学会年次大会, May 2017, Japanese, 高分子学会, 千葉, Domestic conference
    Poster presentation

  • ポリイオン液体中空粒子に対する磁性の付与
    HAYASHI Chihiro, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第55回日本接着学会年次大会, May 2017, Japanese, 日本接着学会, 大阪, Domestic conference
    Poster presentation

  • Preparation of cellulose/polymer composite beads using ionic liquid
    SUZUKI Toyoko, IHARA Yasuhito, MINAMI Hideto
    5th International Conference on Multifunctional, Hybrid and Nanomaterials, Mar. 2017, English, Elsevier Ltd, Lisbon, Portugal, International conference
    Poster presentation

  • Preparation of Silicone Particles via Ring-opening Polymerization of Cyclic Siloxane in Aqueous Medium
    MITSUI Hiroki, IKUBO Satoshi, SUZUKI Toyoko, MINAMI Hideto
    International Polymer Conference 2016, Dec. 2016, English, 高分子学会, 福岡, International conference
    Poster presentation

  • Mechanism of Emulsion Polymerization with Bio-Surfactant
    KUROZUKA Aya, ONISHI Shohei, NAGANO Takuto, YAMAGUCHI Takumi, SUZUKI Toyoko, MINAMI Hideto
    International Polymer Conference 2016, Dec. 2016, English, 高分子学会, 福岡, International conference
    Poster presentation

  • A Facile Method to Prepare Cylindrical Particles by Polystyrene
    LI Wei, SUZUKI Toyoko, MINAMI Hideto
    International Polymer Conference 2016, Dec. 2016, English, 高分子学会, 福岡, International conference
    Poster presentation

  • 微細多孔質構造を有するセルロース粒子の形態制御
    IMAGAWA Kaori, KONO Kyosuke, SUZUKI Toyoko, MINAMI Hideto
    第19回高分子ミクロスフェア討論会, Nov. 2016, Japanese, 高分子ミクロスフェア研究会, 千葉, Domestic conference
    Oral presentation

  • 汎用ポリマー／イオン液体ポリマー複合粒子のモルフォロジィ制御
    OUCHI Takuto, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第19回高分子ミクロスフェア討論会, Nov. 2016, Japanese, 高分子ミクロスフェア研究会, 千葉, Domestic conference
    Oral presentation

  • 生物由来界面活性剤を使用した乳化重合
    KUROZUKA Aya, ONISHI Shohei, NAGANO Takuto, YAMAGUCHI Takumi, SUZUKI Toyoko, MINAMI Hideto
    第19回高分子ミクロスフェア討論会, Nov. 2016, Japanese, 高分子ミクロスフェア研究会, 千葉, Domestic conference
    Oral presentation

  • 水媒体不均一系でのシリコーン粒子の作製
    MITSUI Hiroki, IKUBO Satoshi, SUZUKI Toyoko, MINAMI Hideto
    第19回高分子ミクロスフェア討論会, Nov. 2016, Japanese, 高分子ミクロスフェア研究会, 千葉, Domestic conference
    Oral presentation

  • カプセル内ゾルゲル反応によるシリカ内包粒子の生成機構
    SUZUKI Toyoko, IKUBO Satoshi, MINAMI Hideto
    第19回高分子ミクロスフェア討論会, Nov. 2016, Japanese, 高分子ミクロスフェア研究会, 千葉, Domestic conference
    Oral presentation

  • 溶剤吸収放出法を利用したイオン液体ポリマー複合粒子のモルフォロジィ制御
    OUCHI Takuto, SUZUKI Toyoko, MINAMI Hideto
    2016年度色材研究発表会, Oct. 2016, Japanese, 色材協会, 大阪, Domestic conference
    Poster presentation

  • 多孔質構造セルロース粒子を用いたカプセル化
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    2016年度色材研究発表会, Oct. 2016, Japanese, 色材協会, 大阪, Domestic conference
    Poster presentation

  • ポリイオン液体中空粒子を用いた無機物質の導入
    HAYASHI Chihiro, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    2016年度色材研究発表会, Oct. 2016, Japanese, 色材協会, 大阪, Domestic conference
    Poster presentation

  • 微細多孔質セルロース粒子の形態制御
    IMAGAWA Kaori, KONO Kyosuke, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子討論会, Sep. 2016, Japanese, 高分子学会, 横浜, Domestic conference
    Poster presentation

  • 多孔質セルロース粒子を用いたカプセル化
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子討論会, Sep. 2016, Japanese, 高分子学会, 横浜, Domestic conference
    Oral presentation

  • 磁性を有するポリイオン液体中空粒子の合成
    HAYASHI Chihiro, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子討論会, Sep. 2016, Japanese, 高分子学会, 横浜, Domestic conference
    Poster presentation

  • ひとつもしくは複数のシリカ粒子を内包したポリマーカプセルのワンポット作製
    SUZUKI Toyoko, IKUBO Satoshi, MINAMI Hideto
    第65回高分子討論会, Sep. 2016, Japanese, 高分子学会, 横浜, Domestic conference
    Invited oral presentation

  • シリカ粒子内包ポリマーカプセルの生成機構
    SUZUKI Toyoko, IKUBO Satoshi, MINAMI Hideto
    第14回ゾルゲル学会討論会, Aug. 2016, Japanese, ゾルゲル学会, 東京, Domestic conference
    Poster presentation

  • 微細多孔質構造セルロース粒子を利用したカプセル化
    OMURA Taro, IMAGAWA Kaori, SUZUKI Toyoko, MINAMI Hideto
    第62回高分子研究発表会（神戸）, Jul. 2016, Japanese, 高分子学会関西支部, 神戸, Domestic conference
    Oral presentation

  • 刺激応答開閉カプセル粒子の合成
    MIZUHARA Syuichiro, OUCHI Takuto, SUZUKI Toyoko, MINAMI Hideto
    第62回高分子研究発表会（神戸）, Jul. 2016, Japanese, 高分子学会関西支部, 神戸, Domestic conference
    Oral presentation

  • Morphology Control of Poly(ionic liquid) Composite Particles
    OUCHI Takuto, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    ACA(Asian Conference on Adhesion)2016（第54回日本接着学会年次大会）, Jun. 2016, English, 日本接着学会, 東京, International conference
    Poster presentation

  • 微細多孔質構造を有するセルロース粒子の作製
    IMAGAWA Kaori, KONO Kyosuke, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子学会年次大会, May 2016, Japanese, 高分子学会, 神戸, Domestic conference
    Poster presentation

  • 汎用ポリマー／イオン液体ポリマー複合微粒子のモルフォロジィ制御
    OUCHI Takuto, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子学会年次大会, May 2016, Japanese, 高分子学会, 神戸, Domestic conference
    Poster presentation

  • 生物由来界面活性剤を用いた乳化重合
    KUROZUKA Aya, ONISHI Shohei, NAGANO Takuto, YAMAGUCHI Takumi, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子学会年次大会, May 2016, Japanese, 高分子学会, 神戸, Domestic conference
    Poster presentation

  • 水媒体不均一系での開環重合によるシリコーン粒子の作製
    MITSUI Hiroki, IKUBO Satoshi, SUZUKI Toyoko, MINAMI Hideto
    第65回高分子学会年次大会, May 2016, Japanese, 高分子学会, 神戸, Domestic conference
    Poster presentation

  • ひとつもしくは複数のシリカ粒子を内包したポリマーカプセルの作製
    SUZUKI Toyoko, IKUBO Satoshi, MINAMI Hideto
    日本ゾルゲル学会第１３回討論会, Nov. 2015, Japanese, 日本ゾルゲル学会, 札幌市, Domestic conference
    Poster presentation

  • 新規な生物由来界面活性剤を使用したスチレンの乳化重合
    KUROZUKA Aya, ONISHI Shohei, NAGANO Takuto, YAMAGUCHI Takumi, SUZUKI Toyoko, MINAMI Hideto
    2015年度 色材研究発表会, Oct. 2015, Japanese, 色材協会, 習志野市, Domestic conference
    Poster presentation

  • ミニエマルション系でのカチオン開環重合によるシリコーン粒子の作製
    MITSUI Hiroki, IKUBO Satoshi, SUZUKI Toyoko, MINAMI Hideto
    2015年度 色材研究発表会, Oct. 2015, Japanese, 色材協会, 習志野市, Domestic conference
    Poster presentation

  • Preparation of Poly (ionic liquid) Hollow Particles Having Permeability-Switchable Shell
    NAKAMURA Ryuma, TOKUDA Masayoshi, SUZUKI Toyoko, MINAMI Hideto
    The 5th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres (ASEPFPM2015), Oct. 2015, English, Chinese Academy of Sciences, 蘇州，中国, International conference
    Oral presentation

  • One-Pot Synthesis of Organic/Inorganic Composite Microcapsules by Sol-Gel Process inside a Polymer Capsule
    SUZUKI Toyoko, IKUBO Satoshi, MINAMI Hideto
    The 5th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres (ASEPFPM2015), Oct. 2015, English, Chinese Academy of Sciences, 蘇州，中国, International conference
    Oral presentation

  • Morphology Control of Cellulose Particles Having Spongy Structure
    IMAGAWA Kaori, IHARA Yasuhito, SUZUKI Toyoko, MINAMI Hideto
    The 5th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres (ASEPFPM2015), Oct. 2015, English, Chinese Academy of Sciences, 蘇州，中国, International conference
    Oral presentation

  • 新規な両親媒性可逆的付加開裂連鎖移動(RAFT)剤を用いた水媒体不均一重合
    MINAMI Hideto, SHIMOMURA Kengo, SUZUKI Toyoko, SAKASHITA Keiichi, NODA Tetsuya
    第64回高分子学会討論会, Sep. 2015, Japanese, 高分子学会, 仙台市, Domestic conference
    [Invited]
    Invited oral presentation

  • ポリメタクリル酸メチル／ポリイオン液体複合粒子のモルフォロジィ制御
    OUCHI Takuto, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第64回高分子学会討論会, Sep. 2015, Japanese, 高分子学会, 仙台市, Domestic conference
    Poster presentation

  • ポリマーカプセル内ゾルゲル反応によるシリカ内包粒子の作製
    SUZUKI Toyoko, IKUBO Satoshi, MINAMI Hideto
    第64回高分子学会討論会, Sep. 2015, Japanese, 高分子学会, 仙台市, Domestic conference
    [Invited]
    Invited oral presentation

  • ポリイオン液体中空粒子の作製及びカプセル特性評価
    NAKAMURA Ryuma, TOKUDA Masayoshi, SUZUKI Toyoko, MINAMI Hideto
    第64回高分子学会討論会, Sep. 2015, Japanese, 高分子学会, 仙台市, Domestic conference
    Oral presentation

  • イオン液体を用いて作製した多孔質セルロース粒子の形態制御
    IMAGAWA Kaori, IHARA Yasuhito, SUZUKI Toyoko, MINAMI Hideto
    第64回高分子学会討論会, Sep. 2015, Japanese, 高分子学会, 仙台市, Domestic conference
    Poster presentation

  • イオン液体モノマーを利用した複合高分子微粒子の合成とアニオン交換による機能化
    TOKUDA Masayoshi, SHINDO Tatsunori, SUZUKI Toyoko, MINAMI Hideto
    第64回高分子学会討論会, Sep. 2015, Japanese, 高分子学会, 仙台市, Domestic conference
    Oral presentation

  • 汎用ポリマー／イオン液体ポリマー複合粒子のモルフォロジィ制御
    OUCHI Takuto, NAKAMURA Ryuma, SUZUKI Toyoko, MINAMI Hideto
    第61回高分子研究発表会（神戸）, Jul. 2015, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • 多孔質セルロース粒子の形態制御
    IMAGAWA Kaori, IHARA Yasuhito, SUZUKI Toyoko, MINAMI Hideto
    第61回高分子研究発表会（神戸）, Jul. 2015, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • 新規な生物由来界面活性剤を用いた乳化重合
    KUROZUKA Aya, ONISHI Shohei, SUZUKI Toyoko, MINAMI Hideto, NAGANO Takuto, YAMAGUCHI Takumi
    第61回高分子研究発表会（神戸）, Jul. 2015, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • ミニエマルション系イオン重合によるシリコーン粒子の作製
    MITSUI Hiroki, IKUBO Satoshi, SUZUKI Toyoko, MINAMI Hideto
    第61回高分子研究発表会（神戸）, Jul. 2015, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • イオン液体ポリマー中空粒子の作製及びカプセル特性評価
    NAKAMURA Ryuma, TOKUDA Masayoshi, SUZUKI Toyoko, MINAMI Hideto
    第61回高分子研究発表会（神戸）, Jul. 2015, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Poster presentation

  • 小粒子内包カプセル粒子の作製
    SUZUKI Toyoko
    兵庫県立大学講演会, Jun. 2015, Japanese, 兵庫県立大学, 姫路市, Domestic conference
    [Invited]
    Invited oral presentation

  • Morphology Control of ‘Rattle’-like Polymer Particles Prepared by Suspension Polymerization
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    IPCG Polymer Colloids Conference 2015, Jun. 2015, English, International Polymer Colloids Group, New Hampshire, USA, International conference
    Poster presentation

  • Morphology control of Silica particles prepared by sol-gel process in polymer capsule
    IKUBO Satoshi, MINAMI Hideto, SUZUKI Toyoko
    IPCG Polymer Colloids Conference 2015, Jun. 2015, English, International Polymer Colloids Group, New Hampshire, USA, International conference
    Poster presentation

  • 乳化重合を用いたイオン液体ポリマー微粒子の合成とそのフィルム表面物性
    TOKUDA Masayoshi, SANADA Toshiharu, SUZUKI Toyoko, MINAMI Hideto
    第64回高分子学会年次大会, May 2015, Japanese, 高分子学会, 札幌, Domestic conference
    Oral presentation

  • 異なる分散安定剤を有したヤヌス粒子の作製及び一次元粒子配列制御
    ONISHI Shohei, SUZUKI Toyoko, MINAMI Hideto
    第64回高分子学会年次大会, May 2015, Japanese, 高分子学会, 札幌, Domestic conference
    Oral presentation

  • カプセル内ゾルゲル反応によるシリカ内包粒子の生成メカニズム
    IKUBO Satoshi, MINAMI Hideto, SUZUKI Toyoko
    第64回高分子学会年次大会, May 2015, Japanese, 高分子学会, 札幌, 概要, Domestic conference
    Poster presentation

  • イオン液体を利用したセルロース粒子の作製とその複合化
    SUZUKI Toyoko, IHARA Yasuhito, MINAMI Hideto
    第64回高分子学会年次大会, May 2015, Japanese, 高分子学会, 札幌, Domestic conference
    Poster presentation

  • 微細構造セルロース粒子を利用した複合粒子の作製
    SUZUKI Toyoko, IHARA Yasuhito, KONO Kyosuke, MINAMI Hideto
    第１８回高分子ミクロスフェア討論会, Nov. 2014, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 水素結合を利用した一次元粒子配列制御
    ONISHI Shohei, SUZUKI Toyoko, MINAMI Hideto
    第１８回高分子ミクロスフェア討論会, Nov. 2014, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 新規な可逆的付加開裂連鎖移動(RAFT)剤を用いたミニエマルション重合
    MINAMI Hideto, SHIMOMURA Kengo, SUZUKI Toyoko, SAKASHITA Keiichi, NODA Tetsuya
    第１８回高分子ミクロスフェア討論会, Nov. 2014, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 懸濁重合法を用いたイオン液体ポリマー中空粒子の作製
    NAKAMURA Ryuma, TOKUDA Masayoshi, SUZUKI Toyoko, MINAMI Hideto
    第１８回高分子ミクロスフェア討論会, Nov. 2014, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • カプセル内ゾルゲル反応によるシリカ内包粒子の作製と形態制御
    IKUBO Satoshi, SUZUKI Toyoko, MINAMI Hideto
    第１８回高分子ミクロスフェア討論会, Nov. 2014, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • Preparation of poly(ionic liquid) particles by emulsion polymerization” Workshop on Polymer Nanoparticles
    TOKUDA Masayoshi, SANADA Toshiharu, SHINDO Tatsunori, SUZUKI Toyoko, MINAMI Hideto
    Workshop on Polymer Nanoparticles, Seil-Assembly and Colloids, Nov. 2014, English, University of New South Wales, Sydney, Australia, International conference
    Poster presentation

  • ポリイオン液体中空粒子の作製とその機能変換
    NAMAMURA RYUMA, TOKUDA MASAYOSHI, SHINDO TASTUNORI, SUZUKI TOYOKO, MINAMI HIDETO
    2014年度色材研究発表会, Oct. 2014, Japanese, 色材協会, 名古屋, Domestic conference
    Poster presentation

  • セルロース/汎用ポリマー複合粒子の合成
    IHARA YASUHITO, KONO KYOSUKE, SUZUKI TOYOKO, MINAMI HIDETO
    2014年度色材研究発表会, Oct. 2014, Japanese, 色材協会, 名古屋, Domestic conference
    Poster presentation

  • 分散安定剤間の水素結合を利用した一次元粒子配列制御
    ONISHI Shohei, KONO Kyosuke, MATSUNAGA Naoyuki, SUZUKI Toyoko, MINAMI Hideto
    第63回高分子討論会, Sep. 2014, Japanese, 高分子学会, 長崎市, Domestic conference
    Poster presentation

  • 温度により形状を変化させるイオン液体含有自立ゲル粒子の作製
    MINAMI Hideto, ICHIKAWA Hiroko, SUZUKI Toyoko
    第63回高分子討論会, Sep. 2014, Japanese, 高分子学会, 長崎市, Domestic conference
    [Invited]
    Invited oral presentation

  • シリカ内包カプセル粒子の形態制御とそのメカニズム
    IKUBO Satoshi, MINAMI Hideto, SUZUKI Toyoko
    第63回高分子討論会, Sep. 2014, Japanese, 高分子学会, 長崎市, Domestic conference
    Poster presentation

  • Rattle-likeカプセル粒子の作製
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    第63回高分子討論会, Sep. 2014, Japanese, 高分子学会, 長崎市, Domestic conference
    [Invited]
    Invited oral presentation

  • RAFT Polymerization in a Miniemulsion System using a Novel Type of Amphiphilic RAFT Agent
    MINAMI Hideto, SHIMOMURA Kengo, SUZUKI Toyoko, SAKASHITA Keiichi, NODA Teppei
    5th World Congress on Adhesion and Related Phenomena, Sep. 2014, English, 日本接着学会, 奈良市, International conference
    Oral presentation

  • Control of Morphology of ‘Rattle’-like Particles Prepared by One-step Suspension Polymerization
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    5th World Congress on Adhesion and Related Phenomena, Sep. 2014, English, 日本接着学会, 奈良市, International conference
    Poster presentation

  • Preparation of polymer particles with encapsulated silica
    IKUBO SATOSHI, MINAMI HIDETO, SUZUKI TOYOKO
    第60回高分子研究発表会（神戸）, Jul. 2014, Japanese, 神戸, Domestic conference
    Oral presentation

  • イオン液体ポリマーをシェルとする中空粒子の作製
    NAMAMURA RYUMA, TOKUDA MASAYOSHI, SHINDO TASTUNORI, SUZUKI TOYOKO, MINAMI HIDETO
    第60回高分子研究発表会（神戸）, Jul. 2014, Japanese, 神戸, Domestic conference
    Oral presentation

  • 汎用高分子/イオン液体ポリマー複合微粒子の合成とその構造制御
    SHINDO Tatsunori, TOKUDA Masayoshi, SUZUKI Toyoko, MINAMI Hideto
    第63回高分子学会年次大会, May 2014, Japanese, 高分子学会, 名古屋市, Domestic conference
    Poster presentation

  • 小粒子内包カプセル粒子の一段階作製
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    第63回高分子学会年次大会, May 2014, Japanese, 高分子学会, 名古屋市, Domestic conference
    Poster presentation

  • Preparation of quaternary ammonium-based poly(ionic liquid) particles by emulsion polymerization
    TOKUDA Masayoshi, SANADA Toshiharu, SHINDO Tatsunori, SUZUKI Toyoko, MINAMI Hideto
    色材協会創立85周年記念会議, Oct. 2013, English, 東京都, International conference
    Poster presentation

  • Preparation of one-dimensional particle array utilizing hydrogen bonding interaction
    ONISHI Shohei, KONO Kyosuke, MATSUNAGA Naoyuki, SUZUKI Toyoko, MINAMI Hideto
    色材協会創立85周年記念会議, Oct. 2013, English, 東京都, International conference
    Poster presentation

  • One-step synthesis of “rattle”-like particle (particles-encapsulated particle) by suspension polymerization
    OSUMI Ayumi+i, MINAMI Hideto, SUZUKI Toyoko
    色材協会創立85周年記念会議, Oct. 2013, English, 東京都, International conference
    Poster presentation

  • 乳化重合によるイオン液体ポリマー微粒子の合成
    TOKUDA Masayoshi, SANADA Toshiharu, SHINDO Tatsunori, SUZUKI Toyoko, MINAMI Hideto
    第59回高分子研究発表会（神戸）, Jul. 2013, Japanese, 神戸市, Domestic conference
    Poster presentation

  • 高分子分散安定剤間の水素結合を利用した粒子配列制御
    ONISHI Shohei, KONO Kyosuke, MATSUNAGA Naoyuki, SUZUKI Toyoko, MINAMI Hideto
    第59回高分子研究発表会（神戸）, Jul. 2013, Japanese, 神戸市, Domestic conference
    Oral presentation

  • イオン液体を利用した多孔性セルロース微粒子の形成機構
    KONO Kyosuke, SUZUKI Toyoko, SHIMOMURA Kengo, MINAMI Hideto
    第20回クロマトグラフィーシンポジウム, Jun. 2013, Japanese, 神戸市, Domestic conference
    Poster presentation

  • SaPSeP法を利用した小粒子内包カプセル粒子の作製
    OSUMI Ayumi, MINAMI Hideto, SUZUKI Toyoko
    第20回クロマトグラフィーシンポジウム, Jun. 2013, Japanese, 神戸市, Domestic conference
    Poster presentation

  • Preparation of Raspberry-like Particles Utilizing Hydrogen Bonding Interaction between Polymeric Stabilizers
    MINAMI Hideto, MIZUTA Yusuke, SUZUKI Toyoko
    IPCG Research Conference 2013, Jun. 2013, English, 上海，中国, International conference
    Poster presentation

  • Preparation of Hollow Polymer Particles with Encapsulated Small Particles by Suspension Polymerization
    SUZUKI Toyoko, OSUMI Ayumi+i, MINAMI Hideto
    IPCG Research Conference 2013, Jun. 2013, English, 上海，中国, International conference
    Poster presentation

  • One-pot Synthesis of Polymer Particles with Encapsulated Hollow Silica Particles
    SUZUKI Toyoko, UENISHI Hironobu, MINAMI Hideto
    IPCG Research Conference 2013, Jun. 2013, English, 上海，中国, International conference
    Poster presentation

  • Morphology Control of Cellulose Particles Utilizing an Ionic Liquid
    MINAMI Hideto, KONO Kyosuke, SUZUKI Toyoko, SHIMOMURA Kengo
    IPCG Research Conference 2013, Jun. 2013, English, 上海，中国, International conference
    Poster presentation

  • 水素結合を利用した有機/無機複合ラズベリー状粒子の作製
    CHANG Cheng, SUZUKI Toyoko, MINAMI Hideto
    第62回高分子学会年次大会, May 2013, Japanese, 京都市, Domestic conference
    Oral presentation

  • マイクロカプセル内ゾルゲル反応によるシリカ粒子内包ポリマー粒子の作成
    SUZUKI Toyoko, UENISHI Hironobu, CHANG Cheng, MINAMI Hideto
    第62回高分子学会年次大会, May 2013, Japanese, 京都市, Domestic conference
    Poster presentation

  • 多数の小粒子を内包したカプセル粒子の作製
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    第17回高分子ミクロスフェア討論会, Nov. 2012, Japanese, 仙台市, Domestic conference
    Oral presentation

  • 感温性を有する複合ゲル粒子の作製
    SUZUKI Toyoko, ICHIKAWA Hiroko, MINAMI Hideto
    第17回高分子ミクロスフェア討論会, Nov. 2012, Japanese, 仙台市, Domestic conference
    Oral presentation

  • イオン液体を利用したセルロース微粒子の作製
    MINAMI Hideto, KONO Kyosuke, SUZUKI Toyoko, SHIMOMURA Kengo
    第17回高分子ミクロスフェア討論会, Nov. 2012, Japanese, 仙台市, Domestic conference
    Oral presentation

  • 溶媒吸収放出法を利用した微細構造を有するセルロース微粒子の作製
    MINAMI Hideto, KONO Kyosuke, SUZUKI Toyoko, SHIMOMURA Kengo
    2012年度色材研究発表会, Sep. 2012, Japanese, 堺市, Domestic conference
    Poster presentation

  • 固相分散系での扁平高分子粒子の合成
    MINAMI Hideto, KOJIMA Akihiro, SUZUKI Toyoko
    第61回高分子学会討論会, Sep. 2012, Japanese, 名古屋市, Domestic conference
    Poster presentation

  • マイクロサスペンション重合による小粒子内包カプセル粒子の作製
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    第61回高分子学会討論会, Sep. 2012, Japanese, 名古屋市, Domestic conference
    Poster presentation

  • シリカ内包ポリマーカプセル粒子のワンポット作製
    SUZUKI Toyoko, CHANG Cheng, MINAMI Hideto
    2012年度色材研究発表会, Sep. 2012, Japanese, 堺市, Domestic conference
    Poster presentation

  • イオン液体を利用したセルロース微粒子の作製と形態制御
    MINAMI Hideto, SHIMOMURA Kengo, SUZUKI Toyoko, KONO Kyosuke
    第61回高分子学会討論会, Sep. 2012, Japanese, 名古屋市, Domestic conference
    Poster presentation

  • イオン液体を含有した自立型温度応答性複合ゲル粒子の作製
    MINAMI Hideto, ICHIKAWA Hiroko, SUZUKI Toyoko
    第61回高分子学会討論会, Sep. 2012, Japanese, 名古屋市, Domestic conference
    Oral presentation

  • 溶媒吸収放出法によるセルロース微粒子の形態制御
    MINAMI Hideto, KONO Kyosuke, SUZUKI Toyoko, SHIMOMURA Kengo
    第58回高分子研究発表会（神戸）, Jul. 2012, Japanese, 神戸市, Domestic conference
    Oral presentation

  • 小粒子内包カプセル粒子の作製
    SUZUKI Toyoko, OSUMI Ayumi, MINAMI Hideto
    第58回高分子研究発表会（神戸）, Jul. 2012, Japanese, 神戸市, Domestic conference
    Oral presentation

  • 固相分散系での非真球中空高分子粒子の合成
    MINAMI Hideto, KOJIMA Akihiro, SUZUKI Toyoko
    第57回高分子夏季大学, Jul. 2012, Japanese, 大津市, Domestic conference
    Poster presentation

  • イオン液体を利用した微細構造を有するセルロース微粒子の作製
    MINAMI Hideto, SHIMOMURA Kengo, SUZUKI Toyoko, KONO Kyosuke
    第57回高分子夏季大学, Jul. 2012, Japanese, 大津市, Domestic conference
    Poster presentation

  • カプセル粒子内ゾルゲル反応によるシリカ内包粒子の作成
    SUZUKI Toyoko, CHANG Cheng, MINAMI Hideto
    第50回日本接着学会年次大会, Jun. 2012, Japanese, 福島市, Domestic conference
    Oral presentation

  • 乳化剤含有高分子微粒子を用いた中空粒子の作製
    MATSUSAKA Nami, SUZUKI Toyoko, OKUBO Masayoshi
    第61回高分子学会年次大会, May 2012, Japanese, 横浜市, Domestic conference
    Poster presentation

  • マイクロカプセル内でのゾルゲル反応によるシリカ内包ポリマー粒子の作成
    SUZUKI Toyoko, CHANG Cheng, MINAMI Hideto
    第61回高分子学会年次大会, May 2012, Japanese, 横浜市, Domestic conference
    Oral presentation

  • シェルに開口部を有するカプセル微粒子の作製
    SUZUKI Toyoko, HATA Yuko, MINAMI Hideto, OKUBO Masayoshi
    「ナノ構造・物性」第4回研究会, Jan. 2012, Japanese, 神戸大学自然科学系先端融合研究環, 神戸市, Domestic conference
    Oral presentation

  • Preparation of poly(ethylene glycol dimethacrylate) particles with encapsulated n-hexadecane as heat storage materials by controlled/living radical polymerization in microsuspension (miscrosuspension CLRP)
    SUZUKI Tokoyo, MIZOWAKI Tsugumi, OKUBO Masayoshi
    the 4th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres (ASEPFPM2011), Dec. 2011, English, ASEPFPM, 香港,中国, International conference
    Poster presentation

  • Free-standing Thermosensitive Composite Gel Particles Including Ionic Liquid
    MINAMI Hideto, ICHIKAWA Hiroko, SUZUKI Toyoko, NAKAI Masaya
    WINPTech2011, Dec. 2011, English, 神戸大学連携創造本部イノベーション推進部門, 神戸市, International conference
    Poster presentation

  • 自立型温度応答性複合ゲル粒子の作製
    MINAMI Hideto, ICHIKAWA Hiroko, SUZUKI Toyoko, NAKAI Masaya
    2011年度色材研究発表会, Nov. 2011, Japanese, 色材協会, 東京都, Domestic conference
    Poster presentation

  • 水分散系における選択的表面開始制御/リビングラジカル重合によるキノコ状粒子の合成
    YAMAGAMI Tomoe, TANAKA Takuya, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    第60回高分子学会討論会, Sep. 2011, Japanese, 高分子学会, 岡山市, Domestic conference
    Poster presentation

  • 開口部を有するポリジビニルベンゼン中空高分子微粒子の作製
    SUZUKI Toyoko, HATA Yuko, MINAMI Hideto, OKUBO Masayoshi
    第60回高分子学会討論会, Sep. 2011, Japanese, 高分子学会, 岡山市, Domestic conference
    Oral presentation

  • ノニオン性界面活性剤を用いた極性の異なるモノマーの乳化重合における撹拌速度の影響
    MATSUSAKA Nami, SUZUKI Toyoko, OKUBO Masayoshi
    第60回高分子学会討論会, Sep. 2011, Japanese, 高分子学会, 岡山市, Domestic conference
    Oral presentation

  • イオン液体をカプセル化した微粒子の応用展開
    MINAMI Hideto, NAKAI Masaya, FUKAUMI Hiroki, SUZUKI Toyoko, OKUBO Masayoshi
    第60回高分子学会討論会, Sep. 2011, Japanese, 高分子学会, 岡山市, Domestic conference
    Oral presentation

  • 溶媒吸収放出法を利用したセルロース微粒子の作製
    MINAMI Hideto, SHIMOMURA Kengo, SUZUKI Toyoko, KINOSHITA Keigo
    第57回高分子研究発表会(神戸), Jul. 2011, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Poster presentation

  • イオン液体を含有した感温性ゲル粒子の作製
    MINAMI Hideto, ICHIKAWA Hiroko, SUZUKI Toyoko, NAKAI Masaya
    第57回高分子研究発表会(神戸), Jul. 2011, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • 原子移動ラジカル重合法によるパラフィン内包カプセル粒子の合成
    MIZOWAKI Tsugumi, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    第49回日本接着学会年次大会, Jun. 2011, Japanese, 日本接着学会, 豊田市, Domestic conference
    Oral presentation

  • イオン液体感温性高分子をシェルとしたカプセル高分子微粒子の合成
    MINAMI Hideto, NAKAI Masaya, SUZUKI Toyoko, OKUBO Masayoshi
    第49回日本接着学会年次大会, Jun. 2011, Japanese, 日本接着学会, 豊田市, Domestic conference
    Oral presentation

  • ノニオン性界面活性剤を用いた乳化重合の開始段階における系の非平衡状態が粒子形成に及ぼす影響:モノマーの極性
    MATSUSAKA Nami, SUZUKI Toyoko, OKUBO Masayoshi
    第60回高分子学会年次大会, May 2011, Japanese, 高分子学会, 大阪市, Domestic conference
    Oral presentation

  • SaPSeP法を用いたイオン液体含有感温性高分子微粒子の合成
    MINAMI Hideto, NAKAI Masaya, ICHKAWA Hiroko, SUZUKI Toyoko
    ナノ学会 「ナノ構造・物性」部会 第3回研究会, Mar. 2011, Japanese, ナノ学会, 神戸市, Domestic conference
    Oral presentation

  • Preparation of polymer particles with encapsulated hexadecane as heat storage materials by microsuspension ATRP in aqueous dispersed system
    SUZUKI Toyoko, MIZOWAKI Tsugumi, OKUBO Masayoshi
    The 2010 International Chemical Congress of Pacific Basin Societies (Pacifichem 2010), Dec. 2010, English, 日本化学会, ハワイ, USA, International conference
    Poster presentation

  • Preparation of cross-linked polymer particles with encapsulated liquid crystal by microsuspension polymerization utilizing the SaPSeP method
    TAKENOKUMA Naoko, SUZUKI Toyoko, OKUBO Masayoshi
    The 2010 International Chemical Congress of Pacific Basin Societies (Pacifichem 2010), Dec. 2010, English, 日本化学会, ハワイ, USA, International conference
    Poster presentation

  • 乳化重合開始時における系の非平衡状態が粒子形成及び界面活性剤の吸蔵化に及ぼす影響
    MATSUSAKA Nami, SUZUKI Toyoko, OKUBO Masayoshi
    第16回高分子ミクロスフェア討論会, Nov. 2010, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 蓄熱材への応用を見据えたヘキサデカン内包ポリエチレングリコールジメタクリレートカプセル粒子の作製
    SUZUKI Toyoko, MIZOWAKI Tsugumi, OKUBO Masayoshi
    第16回高分子ミクロスフェア討論会, Nov. 2010, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 水媒体不均一重合における滴中での相分離構造を利用した異形高分子微粒子の作製
    YAMAGAMI Tomoe, TANAKA Takuya, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    第16回高分子ミクロスフェア討論会, Nov. 2010, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 感温性を有するイオン液体含有高分子粒子の合成
    MINAMI Hideto, NAKAI Masaya, SUZUKI Toyoko, OKUBO Masayoshi
    第16回高分子ミクロスフェア討論会, Nov. 2010, Japanese, 高分子ミクロスフェア研究会, 福井市, Domestic conference
    Oral presentation

  • 液晶物質を含有した高分子微粒子の合成
    TAKENOKUMA Naoko, SUZUKI Toyoko, OKUBO Masayoshi
    2010年度 色材研究発表会, Nov. 2010, Japanese, 色材協会, 東京都, Domestic conference
    Poster presentation

  • 乳化重合開始時におけるノニオン性界面活性剤のモノマー・水相への分配状態が粒子形成に与える影響
    MATSUSAKA Nami, SUZUKI Toyoko, OKUBO Masayoshi
    第56回高分子研究発表会(神戸), Jul. 2010, Japanese, 高分子学会, 神戸市, Domestic conference
    Oral presentation

  • マイクロサスペンション重合により誘起される相分離構造を利用した半球状高分子微粒子の合成
    YAMAGAMI Tomoe, TANAKA Takuya, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    第56回高分子研究発表会(神戸), Jul. 2010, Japanese, 高分子学会, 神戸市, Domestic conference
    Oral presentation

  • 乳化重合により作製した高分子微粒子の水分散状態におけるガラス転移温度
    SUZUKI Toyoko, CHAIYASAT Preeyaporn, CHAIYASAT Amorn, OKUBO Masayoshi
    第48回日本接着学会年次大会, Jun. 2010, Japanese, 日本接着学会, 大阪市, Domestic conference
    Oral presentation

  • 発芽状の特異形態を有する中空高分子微粒子の生成
    ITOYAMA Yukiko, ITO Mizuki, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    第59回高分子学会年次大会, May 2010, Japanese, 高分子学会, 横浜市, Domestic conference
    Poster presentation

  • ヘキサデカンを内包したポリエチレングリコールジメタクリレートカプセル粒子の作製とその熱物性
    SUZUKI Toyoko, MIZOWAKI Tsugumi, MINAMI Hideto, OKUBO Masayoshi
    第59回高分子学会年次大会, May 2010, Japanese, 高分子学会, 横浜市, Domestic conference
    Poster presentation

  • マイクロサスペンション重合によるヘキサデカンを含有したカプセル粒子の作製と蓄熱材への応用
    MIZOWAKI Tsugumi, SUZUKI Toyoko, CHAYASAT Preeyaporn, OKUBO Masayoshi
    第18回ポリマー材料フォーラム, Nov. 2009, Japanese, 高分子学会, 東京都, Domestic conference
    Poster presentation

  • 乳化共重合により作製された高分子微粒子中のカルボキシル基分布に与える撹拌の影響
    SUZUKI Toyoko, YANAGISAWA Miyuki, OKUBO Masayoshi
    第58回高分子学会討論会, Sep. 2009, Japanese, 高分子学会, 熊本市, Domestic conference
    Oral presentation

  • Morphologies of poly(n-butylmethacrylate)polystyrene composite particles prepared by Emulsifier-free seeded emulsion polymerization
    KIM Myung-hoon, SUZUKI Toyoko, OKUBO Masayoshi
    3rd Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres, Sep. 2009, English, ASEPFPM, South Korea, Jeju, International conference
    Oral presentation

  • Glass transition temperatures of polymer particles with incorporated nonionic emulsifier in emulsion and dry states
    CHAYASAT Amorn, CHAYASAT Preeyaporn, SUZUKI Toyoko, OKUBO Masayoshi
    3rd Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres, Sep. 2009, English, ASEPFPM, South Korea, Jeju, International conference
    Oral presentation

  • SaPSeP法を用いるマイクロサスペンション重合による液晶物質含有カプセル粒子の合成
    竹之熊直子, SUZUKI Toyoko, OKUBO Masayoshi
    第55回高分子研究発表会(神戸), Jul. 2009, Japanese, 高分子学会関西支部, 神戸市, Domestic conference
    Poster presentation

  • メタクリル酸の乳化共重合により作製された高分子微粒子中のカルボキシル基分布に与える撹拌の影響
    YANAGISAWA Miyuki, SUZUKI Toyoko, OKUBO Masayoshi
    第58回高分子学会年次大会, May 2009, Japanese, 高分子学会, 神戸市, Domestic conference
    Poster presentation

  • マイクロサスペンション重合によるヘキサデカンを含有したポリエチレングリコールジメタクリレートカプセル粒子の合成
    SUZUKI Toyoko, MIZOWAKI Tsugumi, CHAYASAT Preeyaporn, OKUBO Masayoshi
    第58回高分子学会年次大会, May 2009, Japanese, 高分子学会, 神戸市, Domestic conference
    Poster presentation

  • Preparation of Styrene-Methacrylic Acid Copolymer Particles Having Uneven Surface by Emulsion Copolymerization with Nonionic Emulsifier
    SUZUKI Toyoko, LI Haipu, OKUBO Masayoshi
    The 2nd international symposium on advanced particles (ISAP2009), Apr. 2009, English, 第2回先端粒子国際シンポジウム, 横浜市, International conference
    Poster presentation

  • 水分散高分子微粒子のガラス転移温度
    CHAIYASAT Amorn, CHAIYASAT Preeyaporn, SUZUKI Toyoko, OKUBO Masayoshi
    第15回高分子ミクロスフェア討論会, Nov. 2008, Japanese, 神戸大学, Domestic conference
    Oral presentation

  • Estimation for distribution of carboxyl groups within carboxylated copolymer particles prepared by batch emulsion copolymerization under different stirring conditions
    SUZUKI Toyoko, YANAGISAWA Miyuki, OKUBO Masayoshi
    Asia Polymer Symposium (APOSYM/2008), Oct. 2008, English, 済南大学（中国）, International conference
    Poster presentation

  • Effects of End Groups Derived from Initiator and Incorporated Emulsifier on Formation of Multihollow Polymer Particles by Heat Treatment
    KOBAYASHI Hiroshi, MORITAKA Mineho, SUZUKI Toyoko, OKUBO Masayoshi
    Asia Polymer Symposium (APOSYM/2008), Oct. 2008, English, 済南大学（中国）, International conference
    Oral presentation

  • Effect of the particle size on the shell formation mechanism of hollow poly(divinyl benzene) particles with multiple holes in the shell
    HATA Yuko, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    Asia Polymer Symposium (APOSYM/2008), Oct. 2008, English, 済南大学（中国）, International conference
    Poster presentation

  • Effect of Stirring Conditions on Distribution of Carboxyl Groups within Copolymer Particles Prepared by Batch Emulsion Copolymerization
    YANAGISAWA Miyuki, SUZUKI Toyoko, OKUBO Masayoshi
    Asia Polymer Symposium (APOSYM/2008), Oct. 2008, English, 済南大学（中国）, International conference
    Poster presentation

  • Estimation for distribution of carboxyl groups within carboxylated copolymer particles prepared by batch emulsion copolymerization under different stirring conditions
    SUZUKI Toyoko, YANAGISAWA Miyuki, OKUBO Masayoshi
    Polymer Colloids: From Design to Biomedical and Industrial Applications, Jul. 2008, English, Prague，Institute of Macromolecular Chemistry AS CR, International conference
    Poster presentation

  • 不飽和カルボン酸の乳化共重合により作製された高分子微粒子中の カルボキシル基分布の等温滴定型熱量計を用いた評価
    YANAGISAWA Miyuki, SUZUKI Toyoko, OKUBO Masayoshi
    第57回高分子学会年次大会, May 2008, Japanese, 横浜, Domestic conference
    Poster presentation

  • マイクロサスペンション重合法による開口部を有する中空高分子微粒子の合成
    HATA Yuko, SUZUKI Toyoko, MINAMI Hideto, OKUBO Masayoshi
    第57回高分子学会年次大会, May 2008, Japanese, 横浜, Domestic conference
    Poster presentation

  • Thermal Properties of Encapsulated Hexadecane in Cross-linked Capsule Particles with Water and/or Air Domain
    CHAIYASAT Preeyaporn, OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi
    第57回高分子学会年次大会, May 2008, English, 横浜, Domestic conference
    Poster presentation

  • Influence of Water Domain Formed in Hexadecane Core inside Cross-linked Capsule Particle on Thermal Properties for Heat Storage Application
    CHAIYASAT Preeyaporn, OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi
    第10回環太平洋高分子国際会議, Dec. 2007, English, 神戸, International conference
    Poster presentation

  • Effects of end groups derived from initiator and nonionic emulsifier on formation of multihollow structure inside polystyrene particles by heat treatment
    MORITAKA Mineho, KOBAYASHI Hiroshi, TAKANO Eri, SUZUKI Toyoko, OKUBO Masayoshi
    The Pacific Polymer Conference, PPC10, Dec. 2007, English, 神戸，日本, International conference
    Poster presentation

  • Effect of Stirring Conditions on the Incorporation of Nonionic Emulsifier
    KOBAYASHI Hiroshi, MURAI Maiko, SUZUKI Toyoko, OKUBO Masayoshi
    第10回環太平洋高分子国際会議, Dec. 2007, English, 神戸, International conference
    Poster presentation

  • 乳化共重合系における撹拌条件がノニオン性乳化剤の吸蔵化現象及び重合機構に与える影響
    KOBAYASHI Hiroshi, 村井 麻衣子, 鈴木 登代子, OKUBO Masayoshi
    第56回高分子討論会, Sep. 2007, Japanese, 名古屋，日本, Domestic conference
    Oral presentation

  • Preparation of PDVB-based capsule particles containing hexadecane as heat storage materials by the SaPSeP method
    CHAIYASAT Preeyaporn, OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi
    第56回高分子討論会, Sep. 2007, English, 名古屋，日本, Domestic conference
    Oral presentation

  • 乳化重合により作製されたカルボキシル化高分子微粒子中のカルボキシル基分布
    柳澤みゆき, SUZUKI Toyoko, OKUBO Masayoshi
    第53回高分子研究発表会(神戸), Jul. 2007, Japanese, 高分子学会, 兵庫県中央労働センター,神戸市, Domestic conference
    Oral presentation

  • マイクロサスペンション重合法による開口部を有する高分子微粒子の合成
    畠 裕子, SUZUKI Toyoko, 南 秀人, OKUBO Masayoshi
    第53回高分子研究発表会(神戸), Jul. 2007, Japanese, 高分子学会, 兵庫県中央労働センター,神戸市, Domestic conference
    Poster presentation

  • 機器分析を用いた高分子微粒子のキャラクタリゼーションに関する研究
    SUZUKI Toyoko
    第45回日本接着学会年次大会発表, Jun. 2007, Japanese, 日本接着学会, 東京大学, Domestic conference
    [Invited]
    Invited oral presentation

  • スチレンーメタクリル酸の乳化共重合における撹拌状態が乳化剤の吸蔵化現象に及ぼす影響
    村井 麻衣子, SUZUKI Toyoko, 小林 博, OKUBO Masayoshi
    第45回日本接着学会年次大会発表, Jun. 2007, Japanese, 日本接着学会, 東京大学, Domestic conference
    Poster presentation

  • Preparation of Cross-linked Polymer Particles with Encapsulated Hexadecane for Heat Storage Application
    CHAIYASAT Preeyaporn, OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi
    ICAPP2007-The 2nd International Conference on Advances in Petrochemicals and Polymers, Jun. 2007, English, バンコク，タイ, International conference
    Oral presentation

  • Influence of HLB value of nonionic emulsifiers on the distribution of carboxyl groups within styrene-methacrylic acid copolymer particles prepared by emulsion copolymerization
    CHAIYASAT Amorn, YAMADA Masahiro, SUZUKI Toyoko, KOBAYASHI Hiroshi, OKUBO Masayoshi
    ICAPP2007-The 2nd International Conference on Advances in Petrochemicals and Polymers, Jun. 2007, English, バンコク,タイ, International conference
    Poster presentation

  • SaPSeP法によるヘキサデカン内包カプセル粒子の作製とその蓄熱物性
    荻野 由美子, SUZUKI Toyoko, CHAIYASAT Preeyaporn, OKUBO Masayoshi
    第56回高分子学会年次大会, May 2007, Japanese, 高分子学会, 京都国際会議場, Domestic conference
    Poster presentation

  • 環境適応型微粒子材料の創製技術の開発
    Masayoshi Okubo, Hideto Minami, Toyoko Suzuki, Per B. Zetterlund
    神戸大学東京フェア, Jan. 2007, Japanese, 東京, Domestic conference
    Poster presentation

  • 相分離自己組織化(SaPSeP)法によるヘキサデカン含有カプセル粒子の合成と蓄熱材への応用
    荻野 由美子, SUZUKI Toyoko, OKUBO Masayoshi
    第15回ポリマー材料フォーラム, Nov. 2006, Japanese, 高分子学会, 千里ライフサイエンスセンター,大阪, Domestic conference
    Poster presentation

  • ニトロキシル制御/リビングラジカル共重合によるミクロンサイズの橋架け高分子微粒子の合成と橋架け構造
    田中 琢也, SUZUKI Toyoko, OKUBO Masayoshi
    第14回高分子ミクロスフェア討論会, Nov. 2006, Japanese, 高分子ミクロスフェア討論会世話入会, 繊協閣ホール,福井市, Domestic conference
    Oral presentation

  • 水媒体不均一系制御/リビングラジカル重合による橋かけ高分子微粒子の合成
    田中 琢也, SUZUKI Toyoko, 坂 祐一, OKUBO Masayoshi
    第52回高分子研究発表会(神戸), Jul. 2006, Japanese, 高分子学会, 兵庫県中央労働センター,神戸市, Domestic conference
    Oral presentation

  • Preparation of P(DVB-BA) capsules particles containing hexadecane as heat storage materials by the SaPSeP method
    CHAIYASAT Preeyaporn, OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi
    第52回高分子研究発表会（神戸）, Jul. 2006, English, 神戸, Domestic conference
    Poster presentation

  • Distribution of carboxyl groups within styrene-methacrylic acid copolymer particles prepared by emulsion polymerization using nonionic emulsifiers having different HLB values
    SUZUKI Toyoko, YAMADA Masahiro, CHAIYASAT Amorn, OKUBO Masayoshi
    2006), Jun. 2006, English, Dongguk University, Seoul, Korea, International conference
    Poster presentation

  • スチレンーメタクリル酸乳化共重合系における撹拌条件の影響
    村井 麻衣子, 山田 将弘, 小林 博, SUZUKI Toyoko, OKUBO Masayoshi
    第55回高分子学会年次大会, May 2006, Japanese, 高分子学会, 名古屋国際会議場, Domestic conference
    Poster presentation

  • 環境適応型微粒子材料の創製技術の開発
    OKUBO Masayoshi, 南 秀人, SUZUKI Toyoko, PerB.Zetterlund
    工学フォーラム2005, Dec. 2005, Japanese, 神戸大学, ホテルオークラ神戸, Domestic conference
    Poster presentation

  • Estimation and control of distribution of carboxyl groups within polymer particle prepared by seeded emulsion copolymerization with methacrylic acid under monomer-starved condition
    SUZUKI Toyoko, OKABE Jun, OKUBO Masayoshi
    Pacifichem 2005, Dec. 2005, English, Pacifichem 2005 Organizing Committee, Hawaii, International conference
    Poster presentation

  • SaPSeP法によるパラフィン含有カプセル粒子の合成
    OGINO Yumiko, SUZUKI Toyoko, OKUBO Masayoshi
    第51回高分子研究発表会(神戸), Jul. 2005, Japanese, 高分子学会, 兵庫県中央労働センター,神戸市, Domestic conference
    Poster presentation

  • SaPSeP法によるヘキサデカン内包中空高分子微粒子の作製
    SUZUKI Toyoko, MINAMI Hideto, OGINO Yumiko, OKUBO Masayoshi
    第54回高分子学会年次大会, May 2005, Japanese, 高分子学会, 横浜国際会議場, Domestic conference
    Poster presentation

  • Estimation of distribution state of carboxyl groups in carboxylated polymer particle with isothermal titration calorimeter
    SUZUKI Toyoko, TSUDA Naoki, OKUBO Masayoshi
    第2回ミクロスフェア国際討論会, Mar. 2005, English, 福井ワシントンホテル, International conference
    Poster presentation

  • 環境適応型微粒子材料の創製技術の開発
    OKUBO Masayoshi, MINAMI Hideto, SUZUKI Toyoko, Per B. Zetterlund
    工学フォーラム2004, Dec. 2004, Japanese, 神戸大学, 神戸市産業振興センター, Domestic conference
    Poster presentation

  • 種々のモノマー添加法を用いる乳化共重合によるカルボキシル化高分子微粒子の作製とその粒子内分布評価
    OKUBO Masayoshi, 岡部 淳, SUZUKI Toyoko, 岡田 正弘
    第13回高分子ミクロスフェア討論会, Oct. 2004, Japanese, 高分子ミクロスフェア討論会世話入会, 山形大学,米沢市, Domestic conference
    Poster presentation

  • Estimation of swelling state of polymer particles containing neutralized carboxyl groups
    SUZUKI Toyoko, INOUE Mayuko, OKUBO Masayoshi
    World Polymer Congress Macro 2004, Jul. 2004, English, IUPAC, Paris, France, International conference
    Poster presentation

  • アルカリ中和カルボキシル基含有高分子微粒子の吸水状態の評価
    OKUBO Masayoshi, INOUE Mayuko, SUZUKI Toyoko
    第53回高分子学会年次大会, May 2004, Japanese, 高分子学会, 神戸国際会議場, Domestic conference
    Poster presentation

  • Tg of various polymer particles dispersing in water with nano-DSC
    OKUBO Masayoshi, SUZUKI Toyoko, INOUE Mayuko, KOUDA Masaya
    Gordon Research Conference, Jul. 2003, English, The Gordon Research Conferences, Tilton school, NH, USA, International conference
    Poster presentation

  • Surface analysis of PS/PHEMA and PHEMA/PS composite particles, produced by emulsifier-free seeded emulsion polymerization, with atomic force microscopy
    SUZUKI Toyoko, FUKUHARA Yasuyuki, OKUBO Masayoshi
    Gordon Research Conference, Jul. 2003, English, The Gordon Research Conferences, Tilton school, NH, USA, International conference
    Poster presentation

  • エチレンウレア基を表面局在化した高分子エマルション塗膜の湿潤密着性
    OKUBO Masayoshi, 香川 靖之, 松田 光夫, 寺田 明紀, SUZUKI Toyoko
    第41回日本接着学会年次大会, Jun. 2003, Japanese, 日本接着学会, 関西大学, Domestic conference
    Poster presentation

  • 水媒体中における親水/疎水複合高分子微粒子表面の原子間力顕微鏡による解析
    OKUBO Masayoshi, SUZUKI Toyoko, 福原 康弘, 柴田 麻里
    第52回高分子学会年次大会, May 2003, Japanese, 高分子学会, 名古屋国際会議場, Domestic conference
    Poster presentation

  • 水分散系における高分子微粒子のガラス転移温度の評価
    OKUBO Masayoshi, 井上 麻由子, 光田 昌也, SUZUKI Toyoko
    第12回高分子ミクロスフェア討論会, Nov. 2002, Japanese, 高分子ミクロスフェア討論会世話入会, 福井大学工学部, Domestic conference
    Oral presentation

  • 不飽和酸モノマーの乳化共重合における粒子内カルボキシル基分布制御とその解析
    OKUBO Masayoshi, 津田 尚己, SUZUKI Toyoko
    第51回高分子学会討論会, Oct. 2002, Japanese, 高分子学会, 九州工業大学, Domestic conference
    Poster presentation

  • 水分散状態における高分子微粒子のガラス転移温度
    OKUBO Masayoshi, 井上 麻由子, 光田 昌也, SUZUKI Toyoko
    第48回高分子研究発表会【神戸】, Jul. 2002, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

  • 新規な高分子乳化剤を用いる高分子エマルションの作製とそのフィルム物性
    OKUBO Masayoshi, 瀬戸 敦詞, SUZUKI Toyoko, 津田 尚己
    第40回日本接着学会年次大会, Jul. 2002, Japanese, 日本接着学会, 実践女子大学,東京, Domestic conference
    Oral presentation

  • 原子間力顕微鏡を用いる複合高分子微粒子表面の異相構造評価(III)
    OKUBO Masayoshi, SUZUKI Toyoko, 福原 康裕
    第40回日本接着学会年次大会, Jul. 2002, Japanese, 日本接着学会, 実践女子大学,東京, Domestic conference
    Poster presentation

  • Estimation of heterogeneous surface structure of composite particle consisting of hydrophobic and hydrophilic polylmers by atomic force microscopy
    OKUBO Masayoshi, SUZUKI Toyoko, FUKUHARA Yasuhiro
    POLYMER COLLOIDS:Preparation & Properties of Aqueous Polymer Dispersions, Jul. 2002, English, IUPAC, Irsee, Germany, International conference
    Poster presentation

  • 乳化共重合における不飽和酸モノマー添加法が粒子内カルボキシル基分布に及ぼす影響
    OKUBO Masayoshi, 津田 尚己, SUZUKI Toyoko
    第40回日本接着学会年次大会, Jun. 2002, Japanese, 日本接着学会, 実践女子大学,東京, Domestic conference
    Poster presentation

  • Nano-DSCによる水分散高分子微粒子中でのエンタルピー緩和現象の解析
    OKUBO Masayoshi, 光田 昌也, SUZUKI Toyoko
    第40回日本接着学会年次大会, Jun. 2002, Japanese, 日本接着学会, 実践女子大学,東京, Domestic conference
    Poster presentation

  • 無乳化剤乳化重合法により作製したアクリルエマルションの加水分解物を高分子乳化剤とする乳化重合
    OKUBO Masayoshi, 瀬戸 敦詞, SUZUKI Toyoko
    第47回高分子研究発表会(神戸), Jul. 2001, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

  • 等温滴定型熱量計による高分子微粒子のカルボキシル基の分布評価
    OKUBO Masayoshi, SUZUKI Toyoko, 津田 尚己
    第39回接着学会年次大会, Jul. 2001, Japanese, 日本接着学会, 金沢工業大学, Domestic conference
    Poster presentation

  • Nano-DSCによる水分散高分子微粒子のTgの評価
    OKUBO Masayoshi, 光田 昌也, 古川 誉士夫, SUZUKI Toyoko
    第39回接着学会年次大会, Jul. 2001, Japanese, 日本接着学会, 金沢工業大学, Domestic conference
    Poster presentation

  • 粒子溶解法によるカチオン性ナノサイズ粒子の作製
    OKUBO Masayoshi, 伊藤 啓, SUZUKI Toyoko, 森 宏仁
    第50回高分子学会年次大会, May 2001, Japanese, 高分子学会, 大阪, Domestic conference
    Oral presentation

  • 原子間力顕微鏡を用いる複合高分子微粒子表面の異相構造評価
    OKUBO Masayoshi, 福原 康裕, SUZUKI Toyoko
    第79回日本化学会春季年会, Mar. 2001, Japanese, 日本化学会, 甲南大学,神戸市, Domestic conference
    Oral presentation

  • 高分子微粒子中のカルボキシル基の新しい分布評価法
    OKUBO Masayoshi, SUZUKI Toyoko, 浜崎 亮
    第11回高分子ミクロスフェア討論会, Nov. 2000, Japanese, 高分子ミクロスフェア討論会世話入会, 日本薬学会長井記念ホール, Domestic conference
    Oral presentation

  • The acceleration behavior of decomposition of potassium persulfate in the dispersions of polystyrene particles stabilized with nonionic emulsifier
    OKUBO Masayoshi, TASAKI Satoshi, SUZUKI Toyoko
    コロイド界面国際会議, Nov. 2000, English, IUPAC, 東京, International conference
    Poster presentation

  • Absorption behavior of nonionic emulsifier molecules onto polymer particle surfaces estimated by 1H-NMR
    OKUBO Masayoshi, SUZUKI Toyoko, SHINOHARA Reiko
    コロイド界面国際会議, Nov. 2000, English, IUPAC, 東京, International conference
    Poster presentation

  • 等温滴定型熱量計による高分子微粒子中のカルボキシル基の分布評価
    OKUBO Masayoshi, SUZUKI Toyoko, 浜崎 亮, 小田 直彦
    第46回高分子研究発表会 ー神戸ー, Jul. 2000, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

  • 原子間力顕微鏡を用いる複合高分子微粒子表面の異相構造評価
    OKUBO Masayoshi, SUZUKI Toyoko, 福原 康裕
    第46回高分子研究発表会 ー神戸ー, Jul. 2000, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

  • 等温滴定型熱量計を用いた高分子微粒子の表面電解基の定量
    OKUBO Masayoshi, SUZUKI Toyoko, 阪内 敦子, 小田 直彦, 浜崎 亮
    第48回高分子学会討論会, Oct. 1999, Japanese, 高分子学会, 新潟大学, Domestic conference
    Oral presentation

  • 高分子微粒子上のノニオン性界面活性剤の吸着挙動の1H NMR解析
    OKUBO Masayoshi, 篠原 玲子, SUZUKI Toyoko
    第48回高分子学会討論会, Oct. 1999, Japanese, 高分子学会, 新潟大学, Domestic conference
    Oral presentation

  • 等温滴定型熱量計による高分子微粒子中のカルボキシル基の極微小定量
    OKUBO Masayoshi, SUZUKI Toyoko, 小田 直彦, 阪内 敦子
    第45回高分子研究発表会 ー神戸ー, Jul. 1999, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

  • 1H-NMRによる高分子微粒子表面状へのノニオン性界面活性の吸着挙動の解析
    OKUBO Masayoshi, SUZUKI Toyoko
    第37回接着学会年次大会, Jun. 1999, Japanese, 日本接着学会, エポカル筑波, Domestic conference
    Poster presentation

  • 等温滴定型熱量計による極微少量の高分子微粒子の表面電解基の定量
    OKUBO Masayoshi, SUZUKI Toyoko, 阪内 敦子
    第10回高分子ミクロスフェア討論会, Nov. 1998, Japanese, 高分子ミクロスフェア討論会世話入会, 繊協閣ホール,福井市, Domestic conference
    Oral presentation

  • 等温滴定型熱量計による高分子微粒子表面の電解基の定量
    OKUBO Masayoshi, 阪内 敦子, SUZUKI Toyoko
    第44回高分子研究発表会 ー神戸ー, Jul. 1998, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

  • 乳化重合系における過硫酸カリウムの分解挙動
    OKUBO Masayoshi, SUZUKI Toyoko, 田崎 智
    エマルション・サスペンションに関する特別討論会, Jun. 1997, Japanese, 日本化学会, (社)日本化学会講堂,東京, Domestic conference
    Oral presentation

  • 動的膨潤法を利用したシード重合法によるミクロンサイズの単分散複合高分子微粒子の作製
    OKUBO Masayoshi, SUZUKI Toyoko, 山下 毅
    第9回高分子ミクロスフェア討論会, Nov. 1996, Japanese, 高分子ミクロスフェア討論会世話入会, 筑波大学, Domestic conference
    Oral presentation

  • 動的膨潤法を利用したシード重合法による単分散複合高分子微粒子の合成
    OKUBO Masayoshi, SUZUKI Toyoko, 山下 毅
    第41回高分子研究発表会(神戸), Jul. 1995, Japanese, 高分子学会, 兵庫県民会館,神戸市, Domestic conference
    Oral presentation

■ Affiliated Academic Society
  • 日本接着学会

  • 高分子学会

■ Research Themes
  • 微細多孔質セルロース中空粒子の創製と高機能化
    鈴木 登代子, 南 秀人
    日本学術振興会, 科学研究費助成事業 基盤研究(C), 基盤研究(C), 神戸大学, 01 Apr. 2020 - 31 Mar. 2023
    本研究では，一つのカプセル材で水溶性／油溶性物質どちらも内包可能な新規なカプセル材料の創出を目的に，セルロース粒子に特に中空構造の導入を目指している。初年度は，特に中空構造を有するセルロース粒子の作製法の確立を目指した。２年度である今年度は，微細構造をカプセル壁に有したセルロース中空粒子作製に取り組み，セルロースの析出挙動について検討を行った。 1. セルロースの析出挙動：ILとDMFからなるセルロース懸濁滴（媒体はヘキサン）を用いて，すべての溶剤を混和する1-ブタノールと，ILだけはほとんど溶解しないアセトンをセルロース析出溶媒として用いた。ILとDMFがそれらと混和すると同時に，セルロースが析出し微細構造を形成する。これまで電子顕微鏡にて観察してきたセルロース粒子は，表面に膜を張っていたが，薄膜形成がセルロース析出時なのか，乾燥時なのかはっきりしていなかった。本検討により，膜形成が析出時であることが明らかとなった。 2. セルロースの化学修飾（フッ素成分の導入）：無水メタクリル酸と多孔質セルロース粒子のヒドロキシ基を反応させることで、メタクリロイル基が導入されたセルロース粒子を作製し，次に含フッ素チオールとのチオール・エン反応を実施し、フッ素化セルロース粒子を作製した。FT-IR やEDXを用いて，メタクリロイル基やフッ素基の導入を確認した。また，2段階の修飾反応過程での微細構造の消失を懸念したが，凍結乾燥後の未修飾の微細セルロース粒子の比表面積は140 m2/g程度であったのに対し，同程度を維持していた。微細構造は乾燥にて簡単に破壊され緻密粒子となるが，興味深いことに，フッ素化セルロース粒子は自然乾燥においても100m2/g程度の高い比表面積を保持していた。接触角測定でも強い疎水性を示した。

  • Suzuki Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2017 - 31 Mar. 2020, Principal investigator
    Poly(ethylene glycol dimethacrylate-co-methyl methacrylate)(P(EGDM-MMA)) particles with encapsulated tetraethyl orthosilicate (TEOS) were prepared via suspension polymerization using the Self-assembling Phase Separated Polymer (SaPSeP) method which is preparation method for hollow polymer particles. After the polymerization, aq. NH3 was subsequently added to the dispersion as a catalyst for sol-gel process, resulting in formation of P(EGDM-MMA) particles with encapsulated SiO2 particles. The sol-gel process proceeded in the water domains and SiO2 particles were formed only inside the capsules. The morphology of SiO2 particles can be controlled by the coalescence behavior of the domains. Moreover, polymer capsules with Pd particles and a Pd complex and the capsules with Au particles were also prepared. Obtained capsules acted as a catalyst for the Suzuki-Miyaura cross coupling and/or reduced reaction of 4-nitrophenol to 4-aminophenol with NaBH4.
    Competitive research funding

  • MINAMI HIDETO
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2017 - 31 Mar. 2020
    We demonstrated that one-dimensional colloidal chain composed of Janus particles utilizing hydrogen bonding interaction of steric stabilizers of the Janus particle. The colloidal structure can be controlled by changing the surface area ratio of the Janus particles such as dendritic and grafting colloidal structures. It was clarified that the distribution of the association number was in a good agreement with the theoretical curve calculated from step-growth polymerization theory. We also demonstrated preparation of colloidal structure using non-spherical particles. We unexpectedly discovered a facile and novel approach to prepare monodisperse polystyrene (PS) particles having a “cylindrical” shape. Notably, unique adsorption behavior of the cylindrical particles on an oil droplet was observed, in which the cylindrical particles connected head to head to form a network (colloidal structure) that acted as a cage around the oil droplet.
    Competitive research funding

  • 鈴木 登代子
    学術研究助成基金助成金／国際共同研究加速基金(国際共同研究強化), Apr. 2017 - Mar. 2020, Principal investigator
    Competitive research funding

  • Morphological control of encapsulated small particles inside polymer capsules and preparation of their higher-order structure materials(Fostering Joint International Research)
    suzuki toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Fund for the Promotion of Joint International Research (Fostering Joint International Research), Kobe University, 2017 - 2019
    In this study, we aimed to establish a novel functionalization method for capsules to control reactions inside the capsule (nano- to microns-sized). Furthermore, we attempted to apply the structures as micro-sized reactors (femtoreactors) by modification of the encapsulated small particles. In particular, the molecular sieving function of the capsule wall and the structural control of the encapsulated silica particles using the closed femto-space inside the capsule were focused on.

  • Development of Controlled/Living Radical Polymerization in Aqueous Dispersed Systems and Synthesis of Functional Polymer Particles
    Okubo Masayoshi, MINAMI Hideto, SUZUKI Toyoko, CHAIYASAT Amorn, CHAIYASAT Preeyaporn
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2013 - 31 Mar. 2018
    We have tried to apply controlled/living radical polymerization (CLRP), which has been so far mainly developed in homogeneous systems, to aqueous dispersed systems and gotten better harvests than expected. Especially, development of emulsifier-free emulsion polymerization, synthesis of high molecular weight (>10e6), monodisperse polystyrene particles, Syntheses of Janus type nonspherical polymer particles by applying CLRP at the limited locus of polymerization at a particle surface, high performance heat storage microcapsule particles, micrometer-size hydrophilic polymer particles without submicrometer-size byproduct particles, and polymer particles having biosensor functionality have been successfully conducted. These results will contribute to overcoming the long-standing problem and creation of novel functional polymer particles.

  • SUZUKI TOYOKO
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2014 - 31 Mar. 2017, Principal investigator
    Polymer capsules containing small particles were prepared via a one-step suspension polymerization using the Self-assembling Phase Separated Polymer (SaPSeP) method from ethylene glycol dimethacrylate (EGDM)/liquid crystal (LC) droplets containing dissolved polystyrene (PS). We estimated the formation mechanism as following: the encapsulated small particles consisted of poly EGDM, and were formed via precipitation polymerization inside the droplets in competition with formation of the shell. Because the small particles coagulated in the capsules owing to the phase separation of the PS, a toluene/n-hexadecane solution containing an oil-soluble surfactant (polydimethylsiloxane-based macroazoinitiator) was used instead of the LC/PS mixture. Thus, “rattle-like” capsules were successfully prepared using a simple polymerization process. The small particles could move in the capsule and responsed the electric field because the particles having -9 mV of zeta potential.
    Competitive research funding

  • MINAMI Hideto
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2014 - 31 Mar. 2017
    Seeded dispersion polymerization of ionic liquid monomer was carried out in the presence of poly(methylmethacrylate) (PMMA) as seed and composite particles with poly(ionic liquid) (PIL) were obtained. Moreover, we showed that anion exchange of the composite particles can be used to modify the properties of only the PIL component of the composite particles. PIL particles with a single-hollow are also prepared by suspension polymerization from monomer droplets consisting of the ionic liquid monomer, ethylene glycol dimethacrylate, and n-butyl acetate. The obtained particles can be changed from hydrophobic to hydrophilic by anion exchange. Moreover, Janus particles with two hemispheres having different stabilizers, a polystyrene (PS) phase stabilized by poly(acrylic acid) and a PMMA phase stabilized by poly(vinyl pyrrolidone), were able to be synthesized. The facile formation of the colloidal chains via hydrogen bonding interaction between different stabilizers were demonstrated.
    Competitive research funding

  • Synthesis of polymer particles having functionality-changeable property and its colloidal structures(Fostering Joint International Research)
    Minami Hideto, Zetterlund Per B., SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research), Fund for the Promotion of Joint International Research (Fostering Joint International Research), Kobe University, 2016 - 2017
    This project was carried out in University of New South Wales, Australia to further develop the project -“Synthesis of polymer particles having functionality-changeable property and its colloidal structure”. Poly(methyl methacrylate) (PMMA) particles containing reduced graphene oxide (rGO) were successfully prepared by miniemulsion polymerization of rGO-dispersed methyl methacrylate (MMA) monomer utilizing the block copolymer as stabilizer to disperse rGO in the monomer phase. The block copolymer was consisted of ionic liquid polymer, poly(1-(2-methacryloyloxyethyl)-3-butylimidazolium bis(trifluoromethanesulfonyl)amide) (P[Mbim][TFSA]) and PMMA, the concept being that the MMA units impart solubility in the monomer droplets whereas the ionic liquid units act as adsorption sites for rGO.

  • MINAMI HIDETO, SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, Kobe University, 01 Apr. 2012 - 31 Mar. 2014
    In this study, to develop free-standing gel particles that exhibit the thermosensitive properties of the incorporated ionic liquid (IL) without being dispersed in the IL, composite gel particles consisting of 2-phenylethyl methacrylate polymer (PPhEMA) and poly(methyl methacrylate) (PMMA) were prepared by seeded polymerization of MMA in the presence of PPhEMA/IL gel particles, in which PPhEMA exhibited lower critical solution temperature (LCST)-type phase transition behavior in IL. The PPhEMA phase exhibited LCST-type volume-phase transition behavior and separation of IL occurred above the LCST. In contrast, the PMMA phase was swollen with IL separated from the PPhEMA phase. Interestingly, the composite gel particles exhibited similar volume-phase transition behavior in both air and vacuum without leaking of IL from gel particles, which should be free-standing thermosensitive gel particles.
    Competitive research funding

  • MINAMI HIDETO, SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2011 - 31 Mar. 2014
    We have succeeded in preparing functional polymer and composite particles utilizing ionic liquids: 1) Polystyrene (PS)/Mg(OH)2 composite particles were successfully prepared by seeded dispersion sol-gel process in an ionic liquid in the presence of PS seed particles. The composite particles had smooth surfaces and core-shell morphology consisting of PS core and Mg(OH)2 shell having high crystallinity. 2) Micron-sized monodisperse poly(ionic liquid) (PIL) (and composite) particles were prepared by dispersion/emulsion polymerization. Moreover, it confirmed that the obtained particles maintained the properties of the ionic liquid. In addition, cellulose particles were successfully prepared by solvent releasing method, whereby cellulose-ionic liquid droplets dispersed in hexadecane were mixed with 1-butanol. This method is a simple approach for the preparation of cellulose particles having various structures using ionic liquid.
    Competitive research funding

  • New development in preparation of non-spherical polymer particles
    OKUBO Masayoshi, MINAMI Hideto, SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, 2009 - 2011
    We succeeded in preparing various non-spherical polymer particles by emulsion and seeded polymerization. Among these particles, “mushroom”-like polymer particles were prepared by seeded Atom Transfer Radical Polymerizaion（ATRP）of 2-(dimethylamino)ethyl methacrylate (DM) in the presence of hemispherical (“Janus”) poly(methyl methacrylate) (PMMA)/poly[styrene-2-(2-bromoisobutyryloxy)ethyl methacrylate] [P(S-BIEM)] composite particles in an aqueous dispersed system. The obtained composite particles had a Janus morphology: PDM layer only on the surface of P(S-BIEM) phase. We also demonstrated that PMMA/P(S-BIEM)-g-PDM Janus particles exhibit dual responsiveness to pH and temperature.

  • 南 秀人, 鈴木 登代子
    日本学術振興会, 科学研究費助成事業 挑戦的萌芽研究, 挑戦的萌芽研究, 神戸大学, 2009 - 2010
    本研究は,近年,注目されている"イオン液体"(IL)を用いた新たな高分子微粒子の高機能化,精密設計法の確立を目指すものであり,ILを機能性物質として高分子微粒子と複合化した自立型感温性高分子微粒子の合成に挑戦する。初年度の知見を踏まえ,本年度はIL中で低温溶解-高温析出の下限臨界溶液温度(LCST)型相挙動を示すポリベンジルメタクリレート(PBzMA)をシェルとする,ILを含有したカプセル粒子の合成を試み,膨潤媒体中でなくとも中空部がILのリザーバとなることでシェルが低温膨潤-高温収縮し,粒子単体で可逆な体積変化を示す自立型感温性カプセル粒子の創製を試みた。 PBzMAのIL中でのLCSTは220℃と比較的高温であるが,ILと親和性の低いスチレンを共重合することにより,水媒体不均一系での観察が可能な100℃以下にLCSTを低下させた共重合系にて,重合処方の検討を行い,カプセル粒子の作製を行った。シェル層は不完全ではあるもののILを含有した粒子が得られた。 それら粒子は膨潤溶媒であるILに再分散させること無く,水媒体中で温度に応答した体積変化を示し,繰り返し温度を変化させたところ可逆に粒子径を変化することが観察された。しかしながら,ILの漏れだしや強度不足が懸念されたため,さらなる重合系の検討を行った。ポリマーの種類や重合粒子中の粘度制御など詳細に検討を進めたところ,PBzMA誘導体であるポリフェニルエチルメタクリレートを用いた系において,より欠陥の少ないシェルを有するILを含有した粒子が得られ,さらに,水媒体中でより速く温度に応答して可逆に体積変化を示すことが観察された。
    Competitive research funding

  • 大久保 政芳
    科学研究費補助金／基盤研究(A), 2010
    Competitive research funding

  • 大久保 政芳, 南 秀人, 鈴木 登代子, ZETTEERLUND Per B.
    日本学術振興会, 科学研究費助成事業 挑戦的萌芽研究, 挑戦的萌芽研究, 神戸大学, 2008 - 2009
    パラフィンは蓄熱効率が高く,高効率の熱輸送システムが期待されるが,乳化剤による乳化方式では高剪断下により乳化パラフィン滴が破壊されてパラフィンと媒体が相分離してしまう。それに対してパラフィンのマイクロカプセル化法ではそのような問題は生じず最も現実的である。しかしながら,奇妙なことにカプセル化によりパラフィンの過冷却の発生や潜熱量の低下が観察されており,この現象は未解明のままである。これらを解消するために,高級アルコールなど高融点試薬を含有させる手法が検討されているが,現象論にとどまっている。本研究では,マイクロカプセル化されたパラフィンの特異な凝固・融解挙動を詳細に検討し,ミクロ空間でのパラフィンの相転移挙動における界面の存在の影響を明らかにする。さらに,独自のマイクロカプセル合成法を熱輸送物質の高効率カプセル化法として確立することを目指している。昨年度は,マイクロカプセル化に伴う潜熱量の低下を抑制/防止することを目的にカプセル壁を構成するポリマーに焦点をあて検討を行った結果,カプセル壁に極性の高い成分を用いることにより,純パラフィンの高い潜熱量を維持したマイクロカプセルの作成に成功した。 本年度は,高い潜熱量を維持し,さらに過冷却が抑制されたカプセル粒子の作製を試みた。極性の高い架橋モノマーを用いることにより,高い潜熱量を維持したほぼ真球状のカプセル粒子を得ることが出来た。これまでの知見から,粒子径がより大きいほど過冷却が抑制されることが期待されたが,これまでの重合処方では,大粒径のカプセル粒子を得ることができなかった。重合条件を詳細に検討した結果,重合は完結し,凝集物もなくカプセル粒子を得ることができる重合処方を見出した。得られたパラフィン含有カプセル粒子中は,純パラフィンの高い潜熱量を維持し,過冷却の程度も半減した,高効率の蓄熱性を有していた。
    Competitive research funding

  • SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kobe University, 2007 - 2008, Principal investigator
    これまでブラックボックスであった,表面を含めた高分子微粒子中のカルボキシル基の分布状態を明らかにするため,高分子微粒子の分野では利用例のない最新の高感度等温滴定型熱量計(ITC)を用いて新しい評価方法の確立に挑戦した。重合時経時的に,粒子表面の官能基とアルカリの間の中和反応熱を測定し官能基量を求め,それを累積し粒子内分布の推察を行った。各重合系において,このITCを用いた手法は官能基分布の評価法として適用された。さらに,その結果解析を進めることにより,乳化重合のメカニズムも詳細に明らかにすることができた。
    Competitive research funding

  • Preparation of capsule particles by self-assembling phase separated polymer method and its application
    OKUBO Masayoshi, MINAMI Hideto, ZETTERLUND Per B, SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, 2005 - 2007
    We have proposed the preparation method for micron-sized, cross-linked polystyrene/polydivinylbenzene (PS/PDVB) particles having a single hollow. The mechanism for the hollow polymer particles was based on the Self-assembling of Phase Separated Polymer at an interface with aqueous media, which was named the SaPSeP method. Recently, when the SaPSeP method was applied in the presence of sodium dodecyl sulfate (SDS), it was found that a single hole was formed in the shell of the hollow PS/PDVB composite particles. In this research, in order to clarify such a strange phenomenon, preparations of capsule particles were examined in detail. It was clarified that the phase separation in the droplets in the early stage of the polymerization was one of key factors for the formation of the single hole. Hole was most likely formed as a result of reduced microgel adsorption at oil-water interface domains of high SDS content. Moreover, we succeeded in preparing submicrometer-sized hollow PS particles, microcapsules containing curing agent for epoxy resin, and PDVB particles with encapsulated titanium oxide or n-hexadecane (HD)by micro-suspension polymerization utilizing the SaPSeP method. HD is useful for heat storage materials. The encapsulation of HD has many advantages that provide large heat transfer area and control the volume change of the heat storage materials. However, there were some problems in encapsulated HD such as decrease of the heat of solidification and supercooling. In this research, the problem in the application of the polymer particles with encapsulated HD as heat storage material was improved by the copolymerization of hydrophilic acrylic monomer. This seems to be based on that the copolymerizations of hydrophilic monomer enhance the phase separation of copolymer chains and HD, eventually resulting in the complete isolation of the HD core from the polymer shell.

  • 大久保 政芳
    科学研究費補助金／基盤研究(A), 2007
    Competitive research funding

  • 超臨界CO_2流体を媒体とする複合高分子微粒子合成法の創製
    大久保 政芳, 南 秀人, 鈴木 登代子, ZETTERLUND Per B.
    日本学術振興会, 科学研究費助成事業 萌芽研究, 萌芽研究, 神戸大学, 2005 - 2006
    本研究は、環境問題の観点から有機溶媒の代替として注目されている超臨界CO_2流体(scCO_2)を媒体とした,2種以上のポリマーからなる複合高機能性高分子微粒子の合成に挑戦し,この媒体系の特徴であるscCO_2によるポリマーの可塑化効果を有効利用した特異な異相構造からなる複合高分子微粒子の作製の可能性を明確にすることを目的としている。 本年度は、scCO_2流体での分散安定剤として、制御/リビングラジカル重合で作製したブロックポリマー(PDMS-b-PMMA)を用いて、ポリメタクリル酸メチル(PMMA)粒子の作製及び、PMMA粒子存在下スチレン(S)モノマーのシード重合を行い、複合粒子の作製を試みた。scCO_2流体中で,安定剤であるブロックポリマーの組成比,濃度を変化させ重合を行ない、最適な条件を明らかにするとともに、ブロックポリマーのscCO_2への溶解性が作製するPMMA粒子の安定性に大きく影響することを明らかにした。作製した約2ミクロンのPMMA粒子存在下,Sモノマーのシード重合を行うと,単分散性を保持したまま表面に多数のドメインをもつ粒子が作製され、粒子内部は、連続相がPMMAでPSドメインが粒子内に多数ある海島構造が観察された。これらの結果より,scCO_2下において,任意に傾斜異相構造を制御できる複合高分子微粒子の作製法確立へ向け重要な指針を得た。 また、本年は複合粒子の作製のほかにも、scCO_2の特長を活かし、水にも有機溶剤にも溶解するため,媒体との分離が難しく,固体状態で得るには非常に煩雑な工程が必要となる、ポリメタクリル酸ジメチルアミノエチル(PDM)の重合に取り組んだ。PDMは,下限臨界溶液温度を有し,温度変化の繰り返しによる凝集効果を有すると以前に報告している感温性を有する機能性高分子である。圧力や重合温度、開始剤濃度を調整したところ、重合後、超臨界状態から圧力を下げるだけで、粉末状態の乾燥したPDMを得ることができた。

  • Preparation of hollow polymer particles encapsulating functional substance and its application
    OKUBO Masayoshi, MINAMI Hideto, SUZUKI Toyoko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, 2002 - 2004
    Polymer particles with hollow structures have gotten a lot of attention in many industrial fields. Such particles are used as microcapsules, weight-saving or thermal insulation agents, and are applied to hiding or opacifying agents in coating and molding compositions because of their high light-scattering ability. We had succeeded in preparing micron-sized, monodisperse, crosslinking polymer particles having a single hollow at the center by seeded polymerization. Similar hollow polymer particles were produced by suspension polymerization for divinylbenzene (DVB)/toluene droplets dissolving polystyrene though they were polydisperse. The formation of the hollow structure is based on the self- assembling of phase separated polymer at the interface of the droplet. The method is named the Self-assembling of Phase Separated Polymer (SaPSeP) method. In this research, in order to clarify the formation mechanism of hollow particles by the SaPSeP method in more detail, the effects of phase separation of PDVB in the droplets, viscosity within the droplet and its size on the formation of the hollow structure were discussed. The phase separation in the early stage was required point for the formation of the hollow structure. Since the viscosity in the droplet is low at the low conversion, the PDVB can move and adsorb at the interface of the droplet. The mobility of PDVB microgels after the phase separation in polymerizing droplet was important factor for the formation of the hollow structure. The SaPSeP method was developed to produce composite particles encapsulating hinokitiol or magnetite. Moreover, the method was applied to the polyaddition reaction in a suspension system. The polyaddition reaction system satisfied the required conditions for the preparation of hollow particle by the SaPSeP method. In actual, cured epoxy resin particles having one hollow at the center were successfully prepared after evaporation of toluene.

  • 磁性を有するミクロンサイズの単分散高分子微粒子の創製
    大久保 政芳, 鈴木 登代子, 南 秀人
    日本学術振興会, 科学研究費助成事業 萌芽研究, 萌芽研究, 神戸大学, 2001 - 2002
    本研究では申請者らが既に合成に成功しているミクロンサイズで単分散な中空高分子微粒子合成技術をもとに,磁性体が強固な高分子でカプセル化され,かつ単分散であるという磁性体含有機能性複合微粒子の合成方法を確立することを目指している。昨年度は,申請者らが独自に提起している動的膨潤法(DSM)と呼称する新規なモノマー吸収法を用いてミクロンサイズの単分散滴を作製し,そのシード重合を行うことにより得られるミクロンサイズの単分散中空高分子微粒子を用い,ペンタカルボニル鉄を中空部に含有させて200℃で熱処理を行うことにより,磁性粒子の合成を支持する結果が得られている。 本年度は,得られた磁性を有する複合粒子の詳細な解析を行った。具体的には内部異相構造の解明には超薄切片を作製し,電子顕微鏡を用いて観察した結果,すべての粒子の中空粒子内壁に処理前には観察されなかったコントラストの高い部分が観察され,X線回折及びX線マイクロアナライザーによる元素分析の結果,磁性体であるFe_3O_4であることがわかった。さらに熱重量分析の結果より,粒子重量の49%を占める量の磁性体を含有していることが明らかになった。また,得られた磁性粒子表面にが多量の残存ビニル基を有していることを利用し,濃硫酸で処理することにより粒子表面に硫酸基を導入することを検討した。その結果,X線光電子分光法,及び等温滴定型熱量計により硫酸基が粒子表面上に0.7μmol/m^2と高効率に導入されていることを明らかにした。

  • Development of Production of Functional Polymer Particles in Supercritical Carbon Dioxide
    OKUBO Masayoshi, SUZUKI Toyoko, MINAMI Hideto, MATSUO Shigenobu
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 2000 - 2001
    Recently, in addition to water, there have been increasing interests in supercritical carbon dioxide (scCO_2) as environmentally favorable media. The use of scCO_2 as medium for polymerizations has several potential advantages : low cost, low toxicily, eases of medium removal and recycling, and marked variations of solubility power, viscosity and polarity by relatively small changes in temperature and pressure without altering medium composition. The papers describing the dispersion polymerization of vinyl monomers such as methyl methacrylate (MMA) and styrene in scCO_2 have been published in the past eight years. Some fluorinated polymers and poly(dimethylsiloxane) (PDMS)-based polymers have been identified as being soluble in CO_2 or CO_2-philic and have been used as colloidal stabilizers, and there has been increasing interest on the colloidal stabilizers which are effective in scCO_2. In general, PDMS-based polymers may have advantages over fluorinated polymers from the viewpoints that PDMS-based polymers are much less expensive and their solubility in conventional organic solvents makes the characterization of the products obtained easy. In this research, PMMA particles could be produced by dispersion polymerization of MMA in scCO_2 using PDMS-based azoinitiator as inistab (initiator + stabilizer). Production of PMMA particles by the dispersion polymerization of MMA in scCO_2 in the presence of amino propyl terminated PDMS as colloidal stabilizer was also succeeded. Moreover, polydivinylbiphenyl particles were produced by precipitation polymerization of divinylbiphenyl without any stabilizer in scCO_2 at ca. 30 MPa for 24 h at 65℃. The effects of initiation rate of polymerization on the conversion, the fluidity of powder, the degree of coagulation/ the amount of low molecular weight by-products, and the amount of vinyl groups in the particles were examined.

■ Industrial Property Rights
  • ポリイソシアネート構成成分内包微粒子、その製造方法、及び１液型ポリウレタン接着剤組成物
    MINAMI HIDETO, SUZUKI TOYOKO, OKUBO MASAYOSHI
    特願2006-041682, 17 Feb. 2006, 大学長, 特許4899047, 13 Jan. 2012
    Patent right

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