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Journal Articles

Distinctive radiation durability of an ion exchange membrane in the SPE water electrolyzer for the ITER water detritiation system

Iwai, Yasunori; Yamanishi, Toshihiko; Isobe, Kanetsugu; Nishi, Masataka; Yagi, Toshiaki; Tamada, Masao

Fusion Engineering and Design, 81(1-7), p.815 - 820, 2006/02

 Times Cited Count:14 Percentile:71.07(Nuclear Science & Technology)

Solid-polymer-electrolyte (SPE) water electrolysis is attractive in electrolytic process of water detritiation system (WDS) in fusion reactors because it can electrolyze liquid waste directly, but radioactive durability of its ion exchange membrane is a key point. Radioactive durability of Nafion, a typical commercial ion exchange membrane, was experimentally investigated using Co-60 irradiation facility and electron beam irradiation facility at Takasaki Radiation Chemistry Research Establishment of JAERI. Nafion is composed of PTFE (Polytetrafluoroethylene) main chain. However the degradation of its mechanical strength by irradiation was significantly distinguished from that of PTFE and no serious damage was observed for its ion exchange capacity up to 530 kGy, the requirement of ITER. Atmospheric effects such as soaking and oxygen on degrading behaviors were discussed from the viewpoint of radical reaction mechanism. Dependencies of operating temperature and radioactive source are also demonstrated in detail.

Journal Articles

Proton conduction properties of crosslinked PTFE electrolyte membranes with different graft-chain structures

Sawada, Shinichi; Yamaki, Tetsuya; Asano, Masaharu; Terai, Takayuki*; Yoshida, Masaru

Transactions of the Materials Research Society of Japan, 30(4), p.943 - 946, 2005/12

We synthesized crosslinked-polytetrafluoroethylene (PTFE) electrolyte membranes by a radiation grafting technique under different conditions, and then investigated their proton conduction properties at controlled temperatures and relative humidities (R.H.) by an AC impedance method. The density and length of graft chains were controlled by varying the pre-irradiation dose and grafting time, respectively. When the pre-irradiation dose was fixed at 15 kGy to make the graft chains an uniform density, the elongation of the graft chain increased the ion exchange capacity (IEC), there by enhancing their proton conductivity. The membrane with an IEC of 2.8 meq/g possessed the maximum conductivity reaching 0.20 S/cm at 80 $$^{circ}$$C and R.H. 95%. At almost the same IEC, membranes with more and shorter graft chains showed higher conductivity than those with less and longer chains. This result was probably related to the different structures of hydrophilic domains as proton-conducting pathways.

Journal Articles

Performance improvement of fluoropolymer electrolyte membranes by radiation processing

Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru

Gekkan Eko Indasutori, 10(6), p.5 - 11, 2005/06

no abstracts in English

Journal Articles

Journal Articles

Development of highly proton-conductive membranes based on crosslinked fluoropolymers by radiation chemical methods

Yamaki, Tetsuya; Yoshida, Masaru

Nenryo Denchi, 4(3), p.73 - 78, 2005/01

no abstracts in English

Journal Articles

Radiation-modified PTFE as the 21st century material; Development of high function and extreme tenacity for PTFE

Udagawa, Akira*; Ikeda, Shigetoshi*; Yagi, Toshiaki

Hoshasen To Sangyo, (103), p.54 - 58, 2004/09

no abstracts in English

Journal Articles

Polyelectrolyte membranes based on crosslinked polytetrafluoroethylene

Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru

Kogyo Zairyo, 51(4), p.39 - 42, 2003/04

no abstracts in English

Journal Articles

Preparation of crosslinked fluoropolymer electrolyte membranes for use in fuel cells and then investigated their structural properties

Inoue, Yutaka; Kobayashi, Kazuhiro; Yamaki, Tetsuya; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru

Dai-2-Kai 21-Seiki Rengo Shimpojiumu; Kagaku Gijutsu To Ningen Rombunshu, p.257 - 260, 2003/00

We prepared crosslinked fluoropolymer electrolyte membranes for use in fuel cells and then investigated their structural properties by X-ray diffraction (XRD) analysis. The radiation-induced grafting of styrene into crosslinked polytetrafluoroethylene (PTFE) films and subsequent sulfonation enabled us to obtain the electrolyte membrane with a sufficient ion exchange capacity, which exceeds that of the commercially-available film, Nafion. As the crosslinking and styrene grafting reactions proceeded, the size of the PTFE crystallites in the film became smaller, thereby decreasing the film crystallinity. Interestingly, in contrast to Nafion, the resulting sulfonated membranes were found to have high crystallinity.

Journal Articles

Styrene grafted and sulfonated proton conducting membranes based on radiation-crosslinked polytetrafluoroethylene and their fuel cell applications

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 $$geq$$ 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$$^{-1}$$, 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.

Journal Articles

Development of fluoropolymer electrolyte membranes by using a radiation-induced crosslinking technique

Yoshida, Masaru; Yamaki, Tetsuya

Saishin Nenryo Denchi Buzai; Sono Saisentan Gijutsu To Shinraisei Hyoka, p.82 - 92, 2003/00

no abstracts in English

Journal Articles

Crosslinked fluoropolymer electrolyte membranes prepared by ionizing radiation

Yamaki, Tetsuya; Yoshida, Masaru

Zukai, Nenryo Denchi no Subete, p.117 - 119, 2003/00

no abstracts in English

Journal Articles

Polymer electrolyte membrane for fuel cell produced by radiation

Suwa, Takeshi

Porima Daijesuto, 54(3), p.17 - 26, 2002/03

no abstracts in English

Journal Articles

Application of radiation-crosslinked Polytetrafluoroethylene to fiber-reinforced composite materials

Oshima, Akihiro; Udagawa, Akira; Morita, Yosuke

Radiation Physics and Chemistry, 60(4-5), p.467 - 471, 2001/03

 Times Cited Count:10 Percentile:60.79(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.

Journal Articles

Radiation processing for carbon fiber-reinforced polytetrafluoroethylene composite materials

Oshima, Akihiro; Udagawa, Akira; Morita, Yosuke

Radiation Physics and Chemistry, 60(1-2), p.95 - 100, 2001/01

 Times Cited Count:8 Percentile:54.01(Chemistry, Physical)

no abstracts in English

Journal Articles

Application of radiation crosslinked polytetrafluoroethylene to fiber-reinforced composite materials

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

Journal Articles

New trend of radiation application to polymer modification; Irradiation in oxygen free atmosphere and at elevated temperature

Seguchi, Tadao

Radiation Physics and Chemistry, 57, p.367 - 371, 2000/00

 Times Cited Count:25 Percentile:83.13(Chemistry, Physical)

no abstracts in English

Journal Articles

Radiation processing for PTFE composite reinforced with carbon fiber

*; Udagawa, Akira; Morita, Yosuke

Conference Proceeding RadTech Asia'99, p.507 - 512, 1999/08

no abstracts in English

JAEA Reports

Radiation-induced crosslinking of short fiber-filled polytetrafluoroethylene (PTFE)

*; Udagawa, Akira; Morita, Yosuke

JAERI-Tech 99-012, 15 Pages, 1999/02

JAERI-Tech-99-012.pdf:1.09MB

no abstracts in English

JAEA Reports

Development of polytetrafluoroethylene (PTFE) crosslinking technology by $$^{60}$$Co $$gamma$$-rays

Ikeda, Shigetoshi*; Kasai, Noboru; *; *; Haruyama, Yasuyuki; Seguchi, Tadao

JAERI-Tech 99-005, 37 Pages, 1999/02

JAERI-Tech-99-005.pdf:1.79MB

no abstracts in English

Journal Articles

Radiation-induced free radicals and their behaviour in crosslinked polytetrafluoroethylene(PTFE)

Oshima, Akihiro; Seguchi, Tadao; Tabata, Yoneho

Polymer International, 48, p.996 - 1003, 1999/00

 Times Cited Count:21 Percentile:64.83(Polymer Science)

no abstracts in English

49 (Records 1-20 displayed on this page)