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KITAGAWA Tooru
Graduate School of Science, Technology and Innovation / Department of Science, Technology and Innovation
Professor

Researcher basic information

■ Research Keyword
  • ナノ材料工学
  • 高分子構造解析
  • 膜分離工学
■ Research Areas
  • Nanotechnology/Materials / Nanomaterials
■ Committee History
  • Apr. 2022 - Present, 先端膜工学研究推進機構, 理事
  • Apr. 2004 - Mar. 2008, 繊維学会, 編集委員会
  • Apr. 2002 - Mar. 2004, 繊維学会, 企画委員会
  • 大阪大学理学懇話会 学外委員

Research activity information

■ Award
  • Jun. 2016 繊維学会, 論文賞

  • Jul. 2005 繊維学会関西支部, 関西繊維科学研究奨励賞

■ Paper
  • Keizo Nakagawa, Tomoki Watanabe, Miki Tabuchi, Muhammad Prayogie Aulia, Ralph Rolly Gonzales, Tooru Kitagawa, Yasunao Okamoto, Pengfei Zhang, Atsushi Matsuoka, Eiji Kamio, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Jan. 2025, Journal of Membrane Science, 713, 123309 - 123309
    Scientific journal

  • Muhammad Prayogie Aulia, Ralph Rolly Gonzales, Miki Tabuchi, Tooru Kitagawa, Yasunao Okamoto, Pengfei Zhang, Nasrul Arahman, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama
    Elsevier BV, Oct. 2024, Journal of Membrane Science, 710, 123115 - 123115
    Scientific journal

  • Takaya Fujiki, Megumi Kaji, Yuuya Tamamizu, Ryuuki Yasunari, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama, Tomohisa Yoshioka
    Elsevier BV, Jun. 2024, Separation and Purification Technology, 337, 126249 - 126249
    Scientific journal

  • Yasuyuki Miyoshi, Yoshitomo Nakata, Tooru Kitagawa, Hideto Matsuyama, Tomohisa Yoshioka, Keizo Nakagawa
    American Chemical Society (ACS), Feb. 2024, Industrial & Engineering Chemistry Research
    Scientific journal

  • Ryota Kumokita, Takahiro Bamba, Hisashi Yasueda, Ayato Tsukida, Keizo Nakagawa, Tooru Kitagawa, Tomohisa Yoshioka, Hideto Matsuyama, Yasuhito Yamamoto, Satoshi Maruyama, Takahiro Hayashi, Akihiko Kondo, Tomohisa Hasunuma
    Elsevier BV, Feb. 2024, Bioresource Technology, 393, 130144 - 130144
    Scientific journal

  • Zhan Li, Pengfei Zhang, Yu-Hsuan Chiao, Kecheng Guan, Ralph Rolly Gonzales, Ping Xu, Zhaohuan Mai, Guorong Xu, Mengyang Hu, Tooru Kitagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Nov. 2023, Desalination, 566, 116936 - 116936
    Scientific journal

  • Etsuko Tachi, Tomohisa Yoshioka, Takaya Fujiki, Ryuuki Yasunari, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama
    Elsevier BV, Oct. 2023, Separation and Purification Technology, 322, 124091 - 124091, English
    [Refereed]
    Scientific journal

  • Yusuke Yoshiwaka, Tooru Kitagawa, Takuji Shintani, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Sep. 2023, Separation and Purification Technology, 320, 124150 - 124150, English
    [Refereed]
    Scientific journal

  • Shunsuke Kitamura, Tomohisa Yoshioka, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama
    Elsevier BV, Jun. 2023, Separation and Purification Technology, 315, 123576 - 123576
    Scientific journal

  • Tomoki Watanabe, Keizo Nakagawa, Ralph Rolly Gonzales, Tooru Kitagawa, Atsushi Matsuoka, Eiji Kamio, Tomohisa Yoshioka, Hideto Matsuyama
    Wiley, Mar. 2023, Journal of Applied Polymer Science, 140(22) (22), e53900, English
    [Refereed]
    Scientific journal

  • Shota Takao, Saeid Rajabzadeh, Masahide Shibata, Chihiro Otsubo, Toyozo Hamada, Noriaki Kato, Keizo Nakagawa, Tooru Kitagawa, Hideto Matsuyama, Tomohisa Yoshioka
    For the first time, we have successfully fabricated microfiltration (MF) hollow fiber membranes by the thermally induced phase separation (TIPS) and non-solvent induced phase separation (NIPS) methods using cellulose acetate benzoate (CBzOH), which is a cellulose derivative with considerable chemical resistance. To obtain an appropriate CBzOH TIPS membrane, a comprehensive solvent screening was performed to choose the appropriate solvent to obtain a membrane with a porous structure. In parallel, the CBzOH membrane was prepared by the NIPS method to compare and evaluate the effect of membrane structure using the same polymer material. Prepared CBzOH membrane by TIPS method showed high porosity, pore size around 100 nm or larger and high pure water permeability (PWP) with slightly low rection performance compared to that by NIPS. On the contrary, CBzOH membranes prepared with the NIPS method showed three times lower PWP with higher rejection. The chemical resistance of the prepared CBzOH membranes was compared with that of cellulose triacetate (CTA) hollow fiber membrane, which is a typical cellulose derivative as a control membrane, using a 2000 ppm sodium hypochlorite (NaClO) solution. CBzOH membranes prepared with TIPS and NIPS methods showed considerable resistance against the NaClO solution regardless of the membrane structure, porosity and pore size. On the other hand, when the CTA membrane, as the control membrane, was subjected to the NaClO solution, membrane mechanical strength sharply decreased over the exposure time to NaClO. It is interesting that although the CBzOH TIPS membrane showed three times higher pure water permeability than other membranes with slightly lower rejection and considerably higher NaClO resistance, the mechanical strength of this membrane is more than two times higher than other membranes. While CBzOH samples showed no change in chemical structure and contact angle, CTA showed considerable change in chemical structure and a sharp decrease in contact angle after treatment with NaClO. Thus, CBzOH TIPS hollow fiber membrane is noticeably interesting considering membrane performance in terms of filtration performance, mechanical strength and chemical resistance on the cost of slightly losing rejection performance.
    MDPI, Dec. 2022, MEMBRANES, 12(12) (12), English
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Yasuko Mito-oka, Susumu Okihara, Tooru Kitagawa
    Informa UK Limited, Sep. 2018, Journal of Macromolecular Science, Part B, 57(9) (9), 595 - 607
    [Refereed]
    Scientific journal

  • Tooru Kitagawa
    Society of Fiber Science and Technology Japan, 2018, Journal of Fiber Science and Technology, 74(1) (1), 1 - 9
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Nobuyuki Taniguchi, Yukihiro Abe
    Springer Science and Business Media LLC, Apr. 2017, Journal of Materials Science, 52(7) (7), 4142 - 4154
    [Refereed]
    Scientific journal

  • Tooru Kitagawa
    Informa UK Limited, Mar. 2017, Journal of Macromolecular Science, Part B, 56(3) (3), 178 - 193
    [Refereed]
    Scientific journal

  • Nobuyuki Taniguchi, Yukihiro Abe, Yasuko Mitooka, Tooru Kitagawa
    Corresponding, Elsevier BV, Mar. 2017, European Polymer Journal, 88, 9 - 20
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Yukihiro Abe, Hideki Sugihara, Takeshi Ohazama
    Informa UK Limited, Nov. 2016, Journal of Macromolecular Science, Part A, 53(11) (11), 699 - 708
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Yukihiro Abe, Kohei Kiriyama
    Informa UK Limited, Aug. 2016, Journal of Macromolecular Science, Part B, 55(8) (8), 774 - 792
    [Refereed]
    Scientific journal

  • Tooru Kitagawa
    Corresponding, Lifescience Global, Jul. 2016, Journal of Membrane and Separation Technology, 5(2) (2), 57 - 61
    [Refereed]
    Scientific journal

  • Masao Higashi, Junsuke Morita, Norifumi Shimada, Tooru Kitagawa
    Corresponding, Elsevier BV, Feb. 2016, Journal of Membrane Science, 500, 180 - 189
    [Refereed]
    Scientific journal

  • Noriyo Horikawa, Yuki Kawano, Toshiro Miyajima, Yukihiro Nomura, Tooru Kitagawa, Akira Ueno, Akiyoshi Sakaida, Takao Mori
    In this study, tensile strength of PBO fiber with kink band was investigated in single fiber (monofilament) tensile tests. The kink band was introduced by the wrapping fiber bundle to the steel bars with several diameters. Weibull analysis on the obtained tensile strength was carried out to discuss the strength in the on region of kink band. It was found that the tensile strength of PBO fiber decreases with the increase in kink band density. Kink bands act as defects that degrade the tensile strength. A Weibull analysis demonstrated that the concept of effective volume explains the tensile strength of PBO fiber. The reduction of tensile strength at low bar diameters from the appearance of kink bands is not due to changes in strength near the kink bands but rather to the increase in kink band density. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
    Elsevier BV, 2016, Procedia Structural Integrity, 2, 293 - 300, English
    [Refereed]
    Scientific journal


  • Junsuke Morita, Masao Higashi, Norifumi Shimada, Tooru Kitagawa
    Corresponding, Elsevier BV, Dec. 2015, Journal of Water Process Engineering, 8, 160 - 170
    [Refereed]
    Scientific journal

  • Tooru Kitagawa
    Informa UK Limited, Nov. 2015, Journal of Macromolecular Science, Part B, 54(11) (11), 1323 - 1340
    [Refereed]
    Scientific journal

  • Tooru Kitagawa
    Informa UK Limited, Nov. 2015, Journal of Macromolecular Science, Part B, 54(11) (11), 1341 - 1362
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Junsuke Morita, Norifumi Shimada, Masao Higashi
    Corresponding, Lifescience Global, Jun. 2015, Journal of Membrane and Separation Technology, 4(2) (2), 74 - 88
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Kohei Kiriyama, Yusuke Shimizu
    This article concerns PBO fiber structure, especially a preferential orientation of the a‐axis of the PBO crystal in the fiber. It has been reported that the a‐axis of the PBO crystal aligns parallel to the radial direction on the round cross section for PBO AS and HM fibers. This observation was proved by selected‐area electron diffraction and micro‐focus X‐ray diffraction. An application of water vapor coagulation is carried out in this study. It is proved that the fiber so made shows a random orientation of the PBO crystal a‐axis on the cross section. This fact has never been reported on any scientific or engineering journals before as far as the authors have concerned and it becomes state‐of‐the‐art in this study. A mechanism to explain the presence and/or absence of such preference is proposed. The authors believe that the presence of this radial preferential orientation comes from a combination or a balance of polymer‐solvent interaction and the direction of diffusion for solvent from the center to the outside of the fiber.
    Society of Fiber Science and Technology Japan, 2015, Sen'i Gakkaishi, 71(7) (7), 224 - 231, English
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Hideki Sugihara, Masayuki Tsutsumi
    This article concerns surface roughness of PBO fibers. Atomic force microscopy is applied to measuring the surface roughness of the PBO AS, HM and HM+ fibers. Also linear thermal expansion was measured. The reason that the surface roughness is decreased as fiber modulus increases is discussed from the viewpoint of microscopic fiber surface structure. There is a discussion in that the smoothness of fiber surface has relation with fiber modulus, molecular orientation and crystallinity of the fibers. The coefficient of thermal expansion is also measured. The PBO HM+ fiber shows a lower value (-8.7 × 10-6 K-1) of coefficient of thermal expansion than that of the PBO HM.
    Society of Fiber Science and Technology Japan, 2015, Sen'i Gakkaishi, 71(2) (2), 105 - 111, Japanese
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Kazuyuki Yabuki, Andrew C. Wright, Robert. J. Young
    Lead, Springer Science and Business Media LLC, Sep. 2014, Journal of Materials Science, 49(18) (18), 6467 - 6474
    [Refereed]
    Scientific journal

  • Noriyo Horikawa, Yukihiro Nomura, Tooru Kitagawa, Yoshio Haruyama, Akiyoshi Sakaida, Takashi Imamichi, Akira Ueno
    In this paper, fatigue strength behavior of ultraviolet irradiated high-modulus type poly-p-phenylene benzobisoxazole (PBO) fiber was investigated in monofilament tests. The tensile tests of a monofilament were carried out at a gauge length of 12.5 mm and deformation rate of 0.5 mm/min. The fatigue tests of a monofilament were carried out to determine the S-N property at a frequency of 10 Hz with three stress ratios of 0.1, 0.5 and 0.7. Irradiation time was set to 100 h, while radiance was arranged to become 8 W/m2. It was found that the tensile strength of 100 h-irradiated PBO fiber was represented by a two-parameter Weibull distribution. The tensile strength of 100 h-irradiated PBO fiber was lower than that of non-irradiated fiber. And, the fatigue strength of 100 h-irradiated PBO fiber was lower than that of non-irradiated fiber over all fatigue lives. The relationship between the maximum stress and fatigue life was independent of the stress ratio. In addition, it was found by SEM observation that 100 h-irradiated PBO fiber had split vertically in the surface to a depth of about 0.5ìm, but non-irradiated fiber had not the split. Moreover, it was found by EDX analysis that the amount of carbon and oxygen at the surface layer of PBO fiber increased by irradiating UV ray. Thus, reduction in fatigue strength of the PBO fiber by UV irradiation was caused by a degradation of the fiber surface by autoxidation. © 2012 The Japan Society of Mechanical Engineers.
    2012, Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 78(788) (788), 411 - 420, Japanese
    International conference proceedings

  • Noriyo HORIKAWA, Yoshio HARUYAMA
    In this paper, a newly developed process to fabricate micro-sized specimen for axial compressive strength evaluation of single fiber using ultraviolet (UV) lithography was proposed. Technique of UV lithography, which was used in semiconductor production, was adopted to fabricate a test specimen that fiber was partially embedded in a photo-polymer. The photo-polymer SU-8 was used as a resist for high aspect ratio test specimen. A PBO fiber, which has excellent characteristics in tensile strength, tensile modulus and chemical resistance, was used as a test fiber material. Direct axial compression test was performed using the micro-compression testing machine with a flat indenter of 50 μm in diameter and two camera units. Finite element analysis was carried out to compute the internal stress distribution in the fiber under compression and to determine the optimum fiber length. The results showed that the proposed specimen fabrication method using UV lithography was demonstrated to be effective for direct measurement of the compressive strengths of PBO fibers. Finite element analysis revealed that the PBO fiber length in the compression test should be at least 20 μm to avoid the influence of fiber rooting in the resin. The experimental values obtained for the compressive strengths of PBO fibers exhibited Weibull distribution with a mean of 217 MPa, which is lower than the values generally obtained by other test methods such as the loop test or resin embedment test.
    Japan Society of Mechanical Engineers, 2012, TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 78(793) (793), 1358 - 1365, Japanese
    [Refereed]
    Scientific journal

  • Noriyo HORIKAWA, Yoshio HARUYAMA
    The effects of low-intensity UV light irradiation on tensile strength of high-modulus (HM) type poly-p-phenylene benzobisoxazole (PBO) fiber improved tensile modulus by heat-treatment were investigated in a monofilament tensile test. Irradiation time was set to 0 h, 1 h, 10 h, 100 h and 1,000 h, while radiance were arranged to become 2, 4 and 8 W/m2. Standard modulus (As spun: AS) type PBO fiber that authors reported its properties before was employed as standard specimen. It was found that the tensile strength distribution of UV irradiated HM type fiber could be approximated to a normal distribution. The relation between tensile strength and radiation time depend on the degree of radiance. However, the relation between tensile strength and radiation dosage was independent of the degree of radiance, and the radiation dosage was most suitable parameter to describe the tensile strength at the different radiance. The tensile strength of HM type fiber was higher than that of AS type fiber over all radiation dosage. It was found by AFM observation that amount of the surface roughness on the UV irradiated HM type fiber with increasing the radiation dosage was smaller than that of the UV irradiated AS fiber. The reason for that poor crystallite orientation region in HM fiber was less than that in AS fiber and an increase in roughness causes autoxidation occur predominantly in the poor crystallite orientation region. Thus the decrease in tensile strength of fibers under UV light irradiation was attributable to not only cutting an internal molecule by the exposure to UV radiation but also the roughness on the surface of the fiber. Effect of roughness on the tensile strength of the UV irradiated HM type fiber was smaller than that of AS type fiber. However, the effect of roughness on the tensile strength of both fibers was not very large.
    Japan Society of Mechanical Engineers, 2012, TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 78(790) (790), 865 - 878, Japanese
    [Refereed]
    Scientific journal

  • Noriyo HORIKAWA, Yoshio HARUYAMA
    In this paper, effect of strain rate on the tensile strength of high-modulus type poly-p-phenylene benzobisoxazole (PBO) fiber was investigated in monofilament tests. Tensile tests were carried out at a gauge length of 12.5 mm. The strain rate ranged from 6.7×10-4 to 3.2×10-1 s-1. It was found that the tensile strength removed size effect in diameter direction of PBO fiber was represented by a two parameter Weibull distribution under all strain rate conditions. The mean tensile strength at high strain rate range from 4.0×10-2 to 3.2×10-1 s-1 was about 8 % higher than that at low strain rate range from 6.7×10-4 to 1.3×10-2 s-1. In addition, it was found by SEM observation that there were distinct differences between fracture surface image of specimen at high strain rate range and at low strain rate range, i.e., the crack length in fiber direction at high strain rate range was much shorter than that at low strain rate range. However the crack grew along boundaries of microfibrils at the low strain rate range, the crack grew not only along the boundaries but also in the microfibrils at the high strain rate range. Therefore, the increase in tensile strength at the high strain rate range was caused by the difference in the path of crack propagation.
    Japan Society of Mechanical Engineers, 2012, TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 78(788) (788), 421 - 431, Japanese
    [Refereed]
    Scientific journal

  • HAYAKAWA Shota, SHIBAYA Miaki, ISHIHARA Hideaki, ITO Katsuya, TAKEGAWA Yoshinori, KITAGAWA Tooru, FUNAKI Kenichi
    Uniaxially stretched poly(ethylene) terephthalate (PET) and poly(butylene) terephthalate (PBT) films made by a roll stretching method have been characterized by wide angle X-ray diffraction and infrared spectroscopy. Wide angle X-ray diffraction photographs were taken from the three directions (through, edge, and end) for each film, and their double orientation was evaluated. The ratios of the α and β crystal forms of PBT were calculated from infrared spectroscopy data. It was confirmed that both, the ratio of the β form crystal increased and the degree of double orientation of PET and PBT increased as the draw ratio increased. The crystals of PET and the β form crystal of PBT show a planar zig-zag conformation of the methylene residue in the benzene ring plane. They take an extremely flat structure. It is concluded that a flat structure parallel to the film surface is the reason for the double orientation of PET and PBT films.
    The Society of Polymer Science, Japan, 2009, Kobunshi Kagaku, 66(12) (12), 598 - 604, Japanese
    [Refereed]
    Scientific journal

  • Noriyo HORIKAWA, Yukihiro NOMURA, Tooru KITAGAWA, Yoshio HARUYAMA, Akiyoshi SAKAIDA, Takashi IMAMICHI, Akira UENO
    Effect of post heat treatment on tensile strength distribution and its size effect of poly-p-phenylene benzobisoxazole (PBO) fiber were investigated in monofilament tests. Two-parameter Weibull distribution adapted for dependence of fiber strength for both length and diameter direction. It was found that the tensile strength of PBO fibers showed size effect regardless of post heat treatment for both length and diameter direction. The size effect of tensile strength in diameter direction was larger than that in longitudinal direction. For relatively long gauge lengths (12.5mm and over), the tensile strength distribution separated size effect in diameter direction well fitted the Weibull distribution function with 2 parameters. For relatively short gauge lengths (under 12.5mm), it did not fit because distribution of fiber strength was lower than that of strength related to end fracture. The size effect of fiber strength for both length and diameter direction was increased by post heat treatment because crystalline regions increased by heat-treatment and fiber became brittleness.
    Japan Society of Mechanical Engineers, 2009, TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 75(751) (751), 373 - 380, Japanese
    [Refereed]
    Scientific journal

  • Noriyo HORIKAWA, Yukihiro NOMURA, Tooru KITAGAWA, Yoshio HARUYAMA, Akiyoshi SAKAIDA, Takashi IMAMICHI, Akira UENO, Kazunori NAKAGAWA
    In this paper, tensile strength and behavior of low-intensity UV light irradiated poly-p-phenylene benzobisoxazole (PBO) fiber were investigated in monofilament tests. The tensile tests of a monofilament were carried out at a gauge length of 12.5 mm and deformation rate of 0.5 mm/min. Irradiation time was set to 0h, 1h, 10h, 100h and 1,000h, while radiance was arranged to become 2, 4 and 8 W/m2. It was found that the tensile strength distribution of UV irradiated PBO fibers can be approximated to a normal distribution. Regardless of the degree of radiance, the tensile strength tends to decrease gradually with an increase in irradiation time. As radiance intensifies, however, corresponding curved lines move to lower positions, an indication of the dependency of the tensile strength on radiance. The relationship between radiation dosage and tensile strength converges on this one curved line irrespective of the degree of radiance. Therefore radiation dosage should be a valid parameter to measure the degradation of the strength of the PBO fibers exposed to UV light irradiation. In addition, it is found by SEM observation that there are distinct differences between the fracture surface image of UV non-irradiated fiber and that of irradiated fiber. Regardless of UV-irradiation, PBO fibers have split in the direction in which it is set. But the split part in UV-irradiated fiber is shorter than in the UV-non-irradiated fiber because UV-irradiated fiber has split vertically in portions.
    Japan Society of Mechanical Engineers, 2009, Journal of Solid Mechanics and Materials Engineering, 3(1) (1), 1 - 9, English
    [Refereed]
    Scientific journal

  • Tensile and fatigue behavior of poly-p-phenylene benzobisoxazole(PBO) fibers
    Noriyo Horikawa, Yukihiro Nomura, Tooru Kitagawa, Yoshio Haruyama, Akiyoshi Sakaida, Takashi Imamichi
    In this paper, tensile and fatigue strength of standard modulus type (As spun: AS) and high-modulus type (HM) poly-p-phenylene benzobisoxazole (PBO) fiber improved tensile modulus by heat-treatment have been investigated. The tensile tests of a monofilament were carried out at a gauge length of 12.5 mm and deformation rate of 0.5 mm/min. The fatigue tests of a monofilament were carried out to determine the S-N property at a frequency of 10 Hz with three stress ratios of 0.1, 0.5 and 0.7. It was found that the tensile strength of AS and HM fiber was well represented by a two-parameter Weibull distribution. The tensile strength of HM fiber was higher than that of AS fiber. The fatigue strength of HM fiber was higher than that of AS fiber over all fatigue lives because crystalline region in HM fiber increased by heat-treatment. In AS and HM fiber, the relation between the stress amplitude and fatigue life depended on the stress ratio. However, the relation between the maximum stress and fatigue life was independent of the stress ratio. Therefore, it was found that the maximum stress was useful to describe the fatigue lives at the different stress ratios. Additionally, in HM fiber, the factor governing fatigue fracture tended to vary from the mean stress to stress amplitude at the low stress ratio because crystalline regions increased by heat-treatment and fiber became brittleness. It was found by SEM observation that there were distinct differences between the surface image of tensile test specimen and that of fatigue test specimen, i.e., the splitting length in the fatigue test specimens was much longer than that in the tensile test specimens.
    2008, 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, 2, 1546 - 1553, English
    International conference proceedings

  • Noriyo HORIKAWA, Yukihiro NOMURA, Tooru KITAGAWA, Yoshio HARUYAMA, Akiyoshi SAKAIDA, Takashi IMAMICHI, Shinya SASAKI, Tomonari FUKAYA
    In this paper, tensile and fatigue strength of high-modulus (HM) type (258GPa modulus) poly-p-phenylene benzobisoxazole (PBO) fiber improved tensile modulus by heat-treatment have been investigated. The tensile tests of a monofilament were carried out at a gauge length of 12.5mm and deformation rate of 0.5mm/min. The fatigue tests of a monofilament were carried out to determine the S-N property at a frequency of 10Hz with three stress ratios of 0.1, 0.5 and 0.7. Standard modulus (As spun : AS) type (187GPa modulus) PBO fiber that authors reported its properties before was employed as standard specimen. It was found that the tensile strength of HM type PBO fiber was well represented by a two-parameter Weibull distribution, and indicated a size effect in diameter direction. The tensile strength of HM type PBO fiber on the basis of the concept of effective volume was higher than that of AS type fiber. The fatigue strength of HM type PBO fiber was higher than that of AS type fiber over all fatigue lives. The relation between the stress amplitude and fatigue life depended on the stress ratio. However, the relation between the maximum stress ratio and fatigue life was independent of the stress ratio. Therefore, it was found that the maximum stress was useful to describe the fatigue lives at the different stress ratios. Additionally, the factor governing fatigue fracture tended to vary from the mean stress to stress amplitude at the low stress ratio because crystalline regions increased by heat-treatment and fiber became brittleness.
    Society of Materials Science, Japan, 2008, Journal of the Society of Materials Science, Japan, 57(7) (7), 732 - 738, Japanese
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Yoshinobu Izumi, Tooru Kitagawa, Takaya Terada, Hiroshi Hirahata, Kimiko Ema, Hiroyuki Fujishiro, Shigehiro Nishijima
    Wiley, Oct. 2006, Journal of Applied Polymer Science, 102(1) (1), 204 - 209
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Yoshinobu Izumi, Tooru Kitagawa, Takaya Terada, Hideki Sugihara, Hiroshi Hirahata, Kimiko Ema, Hiroyuki Fujishiro, Shigehiro Nishijima
    Wiley, Aug. 2006, Journal of Applied Polymer Science, 101(4) (4), 2619 - 2626
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Yoshinobu Izumi, Takaya Terada, Kimiko Ema, Masayuki Tsutsumi, Muneatsu Nakamura, Takeshi Oohazama, Tooru Kitagawa, Hiroyuki Fujishiro, Shunzo Abe, Shigehiro Nishijima
    Wiley, Jun. 2006, Journal of Applied Polymer Science, 100(6) (6), 5007 - 5018
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Shunzo Abe, Masayuki Tsutsumi, Tooru Kitagawa, Hiroyuki Fujishiro, Kimiko Ema, Yoshinobu Izumi, Shigehiro Nishijima
    Wiley, May 2006, Journal of Applied Polymer Science, 100(3) (3), 2196 - 2202
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Masatoshi Yoshikawa, Shunzo Abe, Masayuki Tsutsumi, Takeshi Oohazama, Tooru Kitagawa, Hiroyuki Fujishiro, Kimiko Ema, Yoshinobu Izumi, Shigehiro Nishijima
    Wiley, Oct. 2005, Journal of Polymer Science Part B: Polymer Physics, 43(19) (19), 2754 - 2766
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Hiroyuki Fujishiro, Toshihiro Kashima, Tooru Kitagawa, Kimiko Ema, Yoshinobu Izumi, Manabu Ikebe, Shigehiro Nishijima
    Wiley, Jun. 2005, Journal of Polymer Science Part B: Polymer Physics, 43(12) (12), 1495 - 1503
    [Refereed]
    Scientific journal

  • Atsuhiko Yamanaka, Tooru Kitagawa, Masayuki Tsutsumi, Toshihiro Kashima, Hiroyuki Fujishiro, Kimiko Ema, Yoshinobu Izumi, Shigehiro Nishijima
    Wiley, Sep. 2004, Journal of Applied Polymer Science, 93(6) (6), 2918 - 2925
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Kohji Tashiro, Kazuyuki Yabuki
    Wiley, Jul. 2002, Journal of Polymer Science Part B: Polymer Physics, 40(13) (13), 1281 - 1287
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Kohji Tashiro, Kazuyuki Yabuki
    Wiley, Jul. 2002, Journal of Polymer Science Part B: Polymer Physics, 40(13) (13), 1269 - 1280
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Kazuyuki Yabuki, Robert J. Young
    Lead, Informa UK Limited, Mar. 2002, Journal of Macromolecular Science, Part B, 41(1) (1), 61 - 76
    [Refereed]
    Scientific journal

  • Kohji Tashiro, Hisakatsu Hama, Jun-Ichi Yoshino, Yukihiro Abe, Tooru Kitagawa, Kazuyuki Yabuki
    Wiley, Jun. 2001, Journal of Polymer Science Part B: Polymer Physics, 39(12) (12), 1296 - 1311
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Kazuyuki Yabuki
    Wiley, May 2001, Journal of Applied Polymer Science, 80(7) (7), 1030 - 1036
    [Refereed]
    Scientific journal

  • T Kitagawa, K Yabuki, R.J Young
    Lead, Elsevier BV, Mar. 2001, Polymer, 42(5) (5), 2101 - 2112
    [Refereed]
    Scientific journal

  • Characterization of structure and properties of polyacrylonitrile-based acrylic fibers
    Bozdogan, F, IsMAIL Karacan, T. Kitagawa
    Dec. 2000, Journal of Materials Science and Technology(Bulgaria)(Bulgaria), 8(3) (3), 119 - 142
    [Refereed]

  • Tooru Kitagawa, Kazuyuki Yabuki
    Wiley, Nov. 2000, Journal of Polymer Science Part B: Polymer Physics, 38(22) (22), 2937 - 2942
    [Refereed]
    Scientific journal

  • An investigation into the relationship between internal stress distribution and a change of poly-p-phenylenebenzobisoxazole (PBO) fiber structure
    Tooru Kitagawa, Kazuyuki Yabuki
    Oct. 2000, Journal of Polymer Science: Polymer Physics, 38(22) (22), 2901 - 2911
    [Refereed]

  • Tooru Kitagawa, Michio Ishitobi, Kazuyuki Yabuki
    Wiley, Jun. 2000, Journal of Polymer Science Part B: Polymer Physics, 38(12) (12), 1605 - 1611
    [Refereed]
    Scientific journal

  • Kohji Tashiro, Junichi Yoshino, Tooru Kitagawa, Hiroki Murase, Kazuyuki Yabuki
    American Chemical Society (ACS), Aug. 1998, Macromolecules, 31(16) (16), 5430 - 5440
    [Refereed]
    Scientific journal

  • Tooru Kitagawa, Hiroki Murase, Kazuyuki Yabuki
    Wiley, Jan. 1998, Journal of Polymer Science Part B: Polymer Physics, 36(1) (1), 39 - 48
    [Refereed]
    Scientific journal

  • 田代 孝二, 吉野 淳一, 北河 享, 村瀬 浩貴
    The Crystallographic Society of Japan, 1997, 日本結晶学会誌, 39, 44 - 44, Japanese

  • Chain Stiffness and Excluded-Volume Effects in Dilute Polymer Solutions. Poly(isophthaloyl-£rans-2,5-dimethylpiperazine)
    Tooru Kitagawa, Jiro Sadanobu, Takashi Norisuye
    Lead, Dec. 1990, Macromolecules, 23, 602 - 607
    [Refereed]

  • Phase Equilibrium in Polymer 4- Polymer + Solvent Ternary Systems. 4. Polystyrene 4- Polyisobutylene in Cyclohexane and in Benzene
    Zhen Tong, Yoshiyuki Einaga, Tooru Kitagawa, Hiroshi Fujita
    Dec. 1989, Macromolecules, 22, 450 - 457
    [Refereed]

■ MISC
  • Improvement of MBR Treatment Capacity Using Novel CPVC Flat-Sheet Membrane : Result of the Demonstration Test in the Sewage Treatment Plant
    森田純輔, 島田憲史, 東昌男, 北河享
    産業用水調査会, 01 Nov. 2015, 用水と廃水, 57(11) (11), 822 - 828, Japanese
    [Refereed]

  • Tensile Strength of Poly-p-Phenylene Benzobisoxazole (PBO) Fiber and its Size Effect
    HORIKAWA Noriyo, NOMURA Yukihiro, KITAGAWA Tooru, HARUYAMA Yoshio, SAKAIDA Akiyoshi, IMAMICHI Takashi, SASAKI Shinya, TAKEKAWA Hideaki
    日本材料強度学会, 29 Oct. 2007, Journal of the Japanese Society for Strength and Fracture of Materials, 41(3) (3), 57 - 65, Japanese

  • TOORU KITAGAWA
    Lead, Society of Fiber Science and Technology Japan, 2007, Sen'i Gakkaishi, 63(8) (8), P.208 - P.208, Japanese

  • A Relationship between Structure and Property of PBO Fibers
    Tooru Kitagawa
    Lead, 01 Mar. 2005, 福井大学工学部研究報告, 53(1) (1), 111 - 116

  • TOORU KITAGAWA
    Lead, Society of Fiber Science and Technology Japan, 2005, Sen'i Gakkaishi, 61(7) (7), P.178 - P.181, Japanese

  • Functionalised plasma polymer coatings for promoting the adhesion of high-performance polymer fibres
    H. Sugihara, T. Kitagawa, F.R. Jones
    Dec. 2004, Polymer Surface Modification: Relevance to Adhesion, 3, 83 - 94

  • PBO繊維の構造と物性の関係について
    北河享
    Lead, 高分子刊行会, Dec. 2003, 高分子加工, 52(12) (12), 565 - 569, Japanese

  • Structural analysis and deformation process of poly-p-phenylenebenzobisoxazole (PBO) fibers
    Tooru Kitagawa
    Lead, Jul. 2003, Recent Res. Devel. Polym. Sci., 7(2003) (2003), 197 - 221
    [Invited]

  • 田代孝二, 吉野淳一, 北河享, 村瀬浩貴, 矢吹和之
    The Crystallographic Society of Japan, Nov. 1998, 日本結晶学会年会講演要旨集, 1998, 190 - 190, Japanese

■ Books And Other Publications
  • 水とポリマー
    北河 享
    Contributor, 第1章 第3節 水が絡んでできる剛直高分子繊維の結晶配向制御, 技術情報協会, May 2021

  • 新訂 最新ポリイミド 基礎と応用
    北河享
    Contributor, 第6章 芳香複素環高分子材料の構造・分子設計, 株式会社エヌ・ティー・エス刊, Dec. 2010

  • Fundamentals and manufactured polymer fibres
    Eichhorn, S. J. (Stephen J.), Textile Institute (Manchester, England)
    Contributor, The Structure of High-modulus, High-tenacity Poly-p-phenylenebenzobisoxazole) Fibres, Woodhead Pub., Nov. 2009, English, ISBN: 9781845693800

  • レオロジーデータハンドブック
    日本レオロジー学会
    Contributor, 4.2.4 PBO繊維, 丸善, Jan. 2006, Japanese, ISBN: 4621076787

  • Encyclopedia of materials : science and technology
    Buschow, K. H. J.
    Contributor, p. 7276-7280 Polymer Fiber Processing: High-performance Fibers, Elsevier, 2001, English, ISBN: 0080431526

■ Lectures, oral presentations, etc.
  • Preferential Orientations of Molecular Planes of Rigid-Rod Polymers along the Radial Direction Normal to the Fiber Axis
    Tooru Kitagawa
    International Congress on Advanced Materials Sciences and Engineering 2019, Jul. 2019
    [Invited]

  • Preferential Orientations of Molecular Planes of Rigid-Rod Polymers along the Radial Direction Normal to the Fiber Axis
    北河 享
    第13回中日先端芳香族高分子研討会, Nov. 2018

  • Preferential Orientations of Molecular Planes of Rigid-Rod Polymers along the Radial Direction Normal to the Fiber Axis
    Tooru Kitagawa
    CCMR 2018, Aug. 2018
    [Invited]

  • 水が絡んでできる繊維中での剛直高分子の結晶軸配向決定
    フロンティアソフトマター開発専用ビームライン産学連合体 第6回 研究発表会, Jan. 2017

  • 剛直性高分子が形作る微細構造の形態について ‐PBO 繊維の例‐
    北河 享
    第21回 日本ポリイミド・芳香族系高分子会議, Dec. 2013
    [Invited]

  • Structure and Properties of PBO Fibre
    Tooru Kitagawa
    Polymer Fibres 2010, Jul. 2010
    [Invited]

  • PBO繊維の構造と物性 ー途中の構造の解析ー
    北河享
    第59回高分子学会年次大会, May 2010
    [Invited]

  • ナノ構造制御によるスーパー繊維の高性能化
    北河 享
    第29回関西繊維科学講座, Dec. 2004
    [Invited]

  • A relationship between structure and property of PBO fiber
    Tooru Kitagawa
    The 33rd Textile Research Symposium at Mt. Fuji (2004), Aug. 2004
    [Invited]

  • Structural analysis of PBO fibers using Raman spectroscopic methods
    Tooru Kitagawa
    Polymer Fibres 2004, Jul. 2004
    [Invited]

  • Stress distribution in PBO fiber as viewed from vibrational spectroscopic measurement under tension
    Tooru Kitagawa, Kohji Tashiro, Kazuyuki Yabuki
    The Fiber Society, Annual Conference, Fall 2003, Oct. 2003
    [Invited]

  • PBO繊維の構造と物性について
    北河 享
    第52回高分子学会年次大会, May 2003
    [Invited]

  • Stress distribution in PBO fibrers as viwed from vibrational spectroscopic measuremant under tension
    Tooru Kitagawa, Kohji Tashiro, Kazuyuki Yabuki
    Polymer Fibres 2002, Jul. 2002
    [Invited]

  • ポリ-p-フェニレンベンゾビスオキサゾール(PBO)繊維の構造と力学変形機構について
    北河 享
    第38回 化学関連支部合同九州大会, Jul. 2001
    [Invited]

■ Affiliated Academic Society
  • 日本膜学会
    Apr. 2022 - Present

  • 化学工学会

■ Works
  • 東洋紡(上海)投資有限公司 Wechat 企業アカウント
    Jan. 2021

■ Industrial Property Rights
  • ポリベンザゾール繊維の乾燥方法
    一柳 隆治, 村瀬 浩貴, 北河 享, ジャン ハイ イム, チー チュン チャウ
    特願平5-304111, 特許03065467
    Patent right

  • ポリベンザゾール繊維の製造方法
    寺本 喜彦, 北河 享, 石飛 三千夫
    特願平7-235208, 特許03661802
    Patent right

  • 高弾性率ポリベンザゾール繊維及びその製造法
    北河 享, 石飛 三千夫
    特願平9-161554, 特許03801734
    Patent right

  • 高弾性率ポリベンザゾール繊維及びその製造法
    北河 享, 石飛 三千夫
    特願平9-280789, 特許04009885
    Patent right

  • 高強度ポリエチレン繊維
    阪本 悟堂, 北河 享, 小田 勝二, 大田 康雄
    特願2000-387652, 特許04478853
    Patent right

  • ポリベンザゾール繊維
    北河 享, 杉原 秀紀
    特願2001-587, 特許03770375
    Patent right

  • ポリベンザゾール繊維
    北河 享, 坂口 佳充, 加地 篤
    特願2001-588, 特許03815596
    Patent right

  • プリプレグ、複合材料及び積層体
    北河 享
    特願2001-248268, 特許04243923
    Patent right

  • 織物
    北河 享
    特願2001-250688, 特許04164731
    Patent right

  • 高強度ポリエチレン繊維
    北河 享, 阪本 悟堂, 小田 勝二, 寺本 喜彦, 大田 康雄
    特願2001-253449, 特許03832631
    Patent right

  • ポリベンザゾール繊維
    北河 享
    特願2001-315784, 特許03852681
    Patent right

  • ポリベンザゾール繊維及びその製造方法
    北河 享, 児玉 哲夫
    特願2001-376006, 特許03918989
    Patent right

  • ポリベンザゾール繊維およびその製造方法
    奥山 幸成, 一柳 隆治, 杉原 秀紀, 北河 享
    特願2002-18787, 特許03912586
    Patent right

  • 産業資材用制電ポリベンザゾール組成物
    北河 享, 中村 宗敦, 阿部 幸浩
    特願2002-32738, 特許04524060
    Patent right

  • 細径電線コード
    北河 享, 阿部 幸治, 大田 康雄
    特願2002-106893, 特許03978653
    Patent right

  • ポリベンザゾ-ルポリマー成形体
    杉原 秀紀, 北河 享, 渡抜 政治
    特願2002-227733, 特許04403485
    Patent right

  • ポリフェニレンサルファイド繊維及び高ろ過性バグフィルタ-用ろ布
    北河 享, 末岐 和史, 杉山 博文
    特願2003-412680, 特許04359830
    Patent right

  • ポリエステルフィルム
    伊藤 勝也, 向山 幸伸, 北河 享, 清水 祐輔
    特願2004-240643, 特許04543313
    Patent right

  • 高強度ポリエチレンマルチフィラメント
    北河 享, 小寺 賢, 篭島 靖, 阪本 悟堂, 福島 靖憲
    特願2004-310746, 特許04565324
    Patent right

  • 高強度ポリエチレンマルチフィラメント
    阪本 悟堂, 福島 靖憲, 村瀬 浩貴, 大田 康雄, 北河 享
    特願2004-310747, 特許04565325
    Patent right

  • 共重合ポリベンザゾール繊維
    谷口 信志, 北河 享, 阿部 幸浩, 水戸岡 靖子, 霧山 晃平, 村瀬 浩貴
    特願2004-370680, 特許04433299
    Patent right

  • ポリベンザゾール系ポリマー及びそれを用いた繊維
    阿部 幸浩, 水戸岡 靖子, 北河 享, 谷口 信志, 久保田 冬彦
    特願2004-371279, 特許04381295
    Patent right

  • 高強度ポリエチレン繊維の製造方法
    福島 靖憲, 阪本 悟堂, 北河 享, 村瀬 浩貴, 大田 康雄
    特願2005-155801, 特許04524644
    Patent right

  • ポリイミドフィルム
    堤 正幸, 北河 享, 東 昌男, 前田 郷司, 河原 恵造, 高橋 則子, 矢吹 寛子
    特願2006-201638, 特許05040205
    Patent right

  • ポリイミドフィルム
    堤 正幸, 北河 享, 東 昌男, 前田 郷司, 河原 恵造, 高橋 則子, 矢吹 寛子
    特願2006-201639, 特許04967495
    Patent right

  • ポリイミドフィルム
    堤 正幸, 北河 享, 東 昌男, 前田 郷司, 河原 恵造, 高橋 則子, 矢吹 寛子
    特願2006-201640, 特許04967496
    Patent right

  • ポリベンザゾール繊維
    北河 享, 霧山 晃平, 渡抜 政治, 寺本 喜彦, 清水 祐輔
    特願2006-226430, 特許04929921
    Patent right

  • ポリベンザゾール繊維の製造方法及びポリベンザゾール繊維
    霧山 晃平, 北河 享, 渡抜 政治, 寺本 喜彦
    特願2006-226431, 特許04929922
    Patent right

  • 表面改質繊維を用いたプリプレグ
    橋本 香菜, 福島 靖憲, 北河 享
    特願2009-110409, 特許05332879
    Patent right

  • 表面改質繊維及びその製造方法
    橋本 香菜, 福島 靖憲, 北河 享
    特願2009-554821, 特許05671798
    Patent right

  • ポリイミドフィルム
    堤 正幸, 北河 享, 東 昌男, 前田 郷司, 河原 恵造, 高橋 則子, 矢吹 寛子
    特願2012-105760, 特許05477418
    Patent right

  • かん水淡水化用の逆浸透膜
    東 昌男, 森田 純輔, 北河 享
    特願2012-137711, 特許05896294
    Patent right

  • ナノろ過用の分離膜
    東 昌男, 森田 純輔, 北河 享
    特願2012-139549, 特許05896295
    Patent right

  • 高分子多孔質平膜シート
    森田 純輔, 東 昌男, 田路 亜妃菜, 島田 憲史, 北河 享
    特願2013-10823, 特許05424145
    Patent right

  • 廃水処理用平膜カートリッジ
    島田 憲史, 森田 純輔, 北河 享, 東 昌男
    特願2013-224827, 特許05742041
    Patent right

  • 排水処理用の逆浸透膜
    東 昌男, 森田 純輔, 北河 享
    特願2013-506393, 特許05252333
    Patent right

  • MBR用高分子多孔質平膜シート
    森田 純輔, 東 昌男, 北河 享, 島田 憲史, 岩嵜 真志
    特願2014-8352, 特許05569832
    Patent right

  • ポリフッ化ビニリデン製高分子多孔質平膜シート
    北河 享, 森田 純輔, 東 昌男, 島田 憲史
    特願2014-30303, 特許05655963
    Patent right

  • 限外ろ過用中空糸膜
    東 昌男, 森田 純輔, 北河 享, 島田 憲史
    特願2014-164167, 特許06303910
    Patent right

  • 複合分離膜
    中尾 崇人, 大亀 敬史, 山根 遼平, 渡抜 政治, 北河 享
    特願2014-552062, 特許06256705
    Patent right

  • 分離膜および分離膜エレメントおよび分離膜モジュール
    中尾 崇人, 明石 真由美, 八尾 美佑紀, 渡抜 政治, 北河 享
    特願2016-553115, 特許06620754
    Patent right

  • 浸漬型中空糸膜モジュール、および、それを用いる正浸透水処理方法
    中尾 崇人, 檜垣 綾乃, 東 昌男, 北河 享
    特願2017-520638, 特許06477872
    Patent right

  • 膜カートリッジの再生方法
    北河 享, 森田 純輔, 東昌 男, 島田 憲史, 檜垣 綾乃
    特願2017-529944, 特許06791142
    Patent right

  • ポリエステル系繊維の製造法
    飯塚 憲央, 作田 光浩, 矢吹 和之, 石原 英昭, 坂口 佳充, 北河 享
    特願平3-217840, 特許03024657
    Patent right

  • ポリエステル系繊維の製造方法
    作田 光浩, 矢吹 和之, 石原 英昭, 坂口 佳充, 北河 享
    特願平2-103715, 特許03038779
    Patent right

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