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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 
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.
Oshima, Akihiro; Udagawa, Akira; Morita, Yosuke
Radiation Physics and Chemistry, 60(4-5), p.467 - 471, 2001/03
Times Cited Count：12 Percentile：64.73(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.
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
*; *; *; Tabata, Yoneho*; Seguchi, Tadao; *
Radiation Physics and Chemistry, 54(2), p.165 - 171, 1999/00
Times Cited Count：78 Percentile：97.56(Chemistry, Physical)no abstracts in English
*; Seguchi, Tadao; Tabata, Yoneho*
Radiation Physics and Chemistry, 55(1), p.61 - 71, 1999/00
Times Cited Count：77 Percentile：97.51(Chemistry, Physical)no abstracts in English
*; Seguchi, Tadao; Tabata, Yoneho*
Radiation Physics and Chemistry, 50(6), p.601 - 606, 1997/00
Times Cited Count：68 Percentile：96.84(Chemistry, Physical)no abstracts in English
*; Ikeda, Shigetoshi*; Seguchi, Tadao; Tabata, Yoneho*
Material Chemistry 96: Proc. of Int. Symp. on Material Chemistry in Nuclear Environment, 0, p.755 - 761, 1996/00
no abstracts in English
