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Sugimoto, Masaki; Morita, Yosuke; Tanaka, Shigeru; Seguchi, Tadao; Ito, Masayoshi*; Okamura, Kiyohito*
IAEA-SM-365/7, p.35 - 40, 2003/09
no abstracts in English
Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Morita, Yosuke; Suwa, Takeshi; Chen, J.*; Tsubokawa, Norio*; Kobayashi, Kazuhiro*; Kubota, Hitoshi*; Yoshida, Masaru
Radiation Physics and Chemistry, 67(3-4), p.403 - 407, 2003/08
Times Cited Count:76 Percentile:97.04(Chemistry, Physical)no abstracts in English
Yamaki, Tetsuya; Asano, Masaharu; Morita, Yosuke*; Suwa, Takeshi*; Yoshida, Masaru
Proceedings of 9th International Conference on Radiation Curing (RadTech Asia '03) (CD-ROM), 4 Pages, 2003/00
Proton exchange membranes were prepared by the radiation-induced grafting of styrene into crosslinked polytetrafluoroethylene (PTFE) films and subsequent sulfonation. The degree of grafting was controlled in the range of 7-75% by the crosslinking density of the PTFE matrix as well as the grafting conditions. The films at the grafting yield of 30% were found to give the ion exchange membranes with a homogeneous distribution of sulfonic acid groups. The resulting membranes showed a large ion exchange capacity reaching 2.9 meq g, which exceeded the performance of commercially-available perfluorosulfonic acid films such as Nafion. This will encourage the use of our ion exchange membranes in polymer electrolyte fuel cells.
Suwa, Takeshi; Morita, Yosuke
Hoshasen To Sangyo, (93), p.22 - 28, 2002/03
no abstracts in English
Idesaki, Akira; Narisawa, Masaki*; Okamura, Kiyohito*; Sugimoto, Masaki; Tanaka, Shigeru; Morita, Yosuke; Seguchi, Tadao; Ito, Masayoshi*
Journal of Materials Science, 36(23), p.5565 - 5569, 2001/12
Times Cited Count:40 Percentile:78.48(Materials Science, Multidisciplinary)A very fine silicon carbide (SiC) fiber with diameter of 6 m, about a half of that of a commercially available SiC fiber, was synthesized from a polymer blend of polycarbosilane (PCS) and polyvinylsilane (PVS). The fine SiC fiber was obtained by optimizing the composition and the spinning temperature of PCS-PVS polymer blends. In order to determine these optimum conditions, the relationship between temperature and melt viscosities of the polymer blends was investigated. As a result, it was found that the optimum spinning temperature range was within a temperature range where the melt viscosity is 5-10Pas. Moreover, by blending PVS with PCS, the spinning temperature of the polymer blends was lowered, the spinnability of polymer system was improved, and finer polymer fiber was obtained compared with PCS. The optimum content of PVS in the polymer blend was 15-20wt%.
Oshima, Akihiro; Udagawa, Akira; Morita, Yosuke
Radiation Physics and Chemistry, 60(4-5), p.467 - 471, 2001/03
Times Cited Count:12 Percentile:64.76(Chemistry, Physical)Plain-woven carbon fber-filled polytetrafluoroethylene (PTFE)composites were fabricated by radiation-crosslinking under selective conditions.High mechanical and frictional properties are found in the composite materials compared with crosslinked PTFE without fiber.The composite materials with optional shapes,which are laminated after electron beam (EB) crosslinking treatment of each mono-layer could also be fabricated.
Idesaki, Akira*; Narisawa, Masaki*; Okamura, Kiyohito*; Sugimoto, Masaki; Morita, Yosuke; Seguchi, Tadao; Ito, Masayoshi*
Journal of Materials Science, 36(2), p.357 - 362, 2001/01
Times Cited Count:15 Percentile:53.58(Materials Science, Multidisciplinary)no abstracts in English
Oshima, Akihiro; Udagawa, Akira; Morita, Yosuke
Radiation Physics and Chemistry, 60(1-2), p.95 - 100, 2001/01
Times Cited Count:8 Percentile:52.41(Chemistry, Physical)no abstracts in English
Idesaki, Akira; Sugimoto, Masaki; Tanaka, Shigeru; Morita, Yosuke; Narisawa, Masaki*; Okamura, Kiyohito*; Ito, Masayoshi*
High Temperature Ceramic Matrix Composites, p.35 - 40, 2001/00
Silicon carbide (SiC) fiber, which is one of the likeliest candidates as a reinforcement fiber of ceramic matrix composites (CMCs), is synthesized from polycarbosilane (PCS). The diameter of thus SiC fibers is 10-15 m. In order to fabricate CMCs with 3-dimensional complex shapes, it is important to develop a SiC fiber with diameter of less than 10 m, flexibility, and high strength. In order to improve the spinnability of precursor polymer, we have blended polyvinylsilane (PVS), which is a liquid polymer at room temperature, to PCS as a spinning additive. According to relationship between temperature and melt viscosity of the polymer blend, it was found that the polymer can be melt-spun at about 490K, 110K lower than PCS (about 600K), and that the spinnability of the polymer is improved by blending PVS. Fine polymer fiber was obtained from the polymer blend, and finally, very fine SiC fiber with the average diameter of 6 m was synthesized from the PCS-PVS polymer blend.
Obara, Kenjiro; Tada, Eisuke; Koizumi, Koichi; Yagi, Toshiaki; Morita, Yosuke
Proceedings of Radiation Effects on Components and Systems (RADECS 2000), p.214 - 218, 2000/09
no abstracts in English
Idesaki, Akira*; Narisawa, Masaki*; Okamura, Kiyohito*; Sugimoto, Masaki; Morita, Yosuke; Seguchi, Tadao; Ito, Masayoshi*
Proceedings of International Symposium on Prospect for Application of Radiation towards the 21st Century, p.139 - 140, 2000/03
no abstracts in English
Oshima, Akihiro; Udagawa, Akira; Morita, Yosuke
Proceedings of International Symposium on Prospect for Application of Radiation towards the 21st Century, p.83 - 84, 2000/00
no abstracts in English
*; Udagawa, Akira; Morita, Yosuke
Conference Proceeding RadTech Asia'99, p.507 - 512, 1999/08
no abstracts in English
*; Obara, Kenjiro; Tada, Eisuke; Morita, Yosuke; Yagi, Toshiaki; *
JAERI-Tech 99-029, 36 Pages, 1999/03
no abstracts in English
*; Udagawa, Akira; Morita, Yosuke
JAERI-Tech 99-012, 15 Pages, 1999/02
no abstracts in English
Obara, Kenjiro; Kakudate, Satoshi; Oka, Kiyoshi; *; *; Koizumi, Koichi; Shibanuma, Kiyoshi; Yagi, Toshiaki; Morita, Yosuke; ; et al.
JAERI-Tech 99-003, 312 Pages, 1999/02
[This article is unavailable to download the full text due to various reasons.]
Morita, Yosuke; Yagi, Toshiaki; *
Denki Gakkai Yuden, Zetsuen Zairyo Kenkyukai Shiryo; DEI-99-12, p.23 - 26, 1999/02
no abstracts in English
Morita, Yosuke; Yagi, Toshiaki; *
Denki Gakkai Yuden, Zetsuen Zairyo Kenkyukai Shiryo; DEI-99-13, p.27 - 30, 1999/02
no abstracts in English
Morita, Yosuke; Obara, Kenjiro
Denki Gakkai Yuden, Zetsuen Zairyo Kenkyukai Shiryo; DEI-99-18, p.55 - 58, 1999/02
no abstracts in English
G.Wu*; Katsumura, Yosuke*; Kudo, Hisaaki; Morita, Yosuke; Seguchi, Tadao
J. Polym. Sci., Part A, 37(10), p.1541 - 1548, 1999/00
no abstracts in English