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-poly(alkyl vinyl ether) membranes for polymer electrolyte membrane fuel cells by radiation processingChen, J.; Asano, Masaharu; Yamaki, Tetsuya; Yoshida, Masaru
Journal of Membrane Science, 256(1-2), p.38 - 45, 2005/06
New polymer electrolyte membranes having sulfonic acid groups for polymer electrolyte membrane fuel cell applications were prepared by simultaneous radiation-induced grafting method. The poly(tetrafluoroethylene) (PTFE) films, crosslinked by electron-beam radiation at molten temperature, were used as substrates for grafting of two alkyl vinyl ether monomers, propyl vinyl ether (nPVE) and isopropyl vinyl ether (iPVE), under controlled grafting conditions followed by sulfonation reactions. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), water contact angle and Fourier transform infrared (FTIR) were used to characterize the crosslinked PTFE (cPTFE) and grafted cPTFE films. The degree of grafting was found to be dependent on the grafting parameters such as irradiation temperature and Lewis acid catalyst, in which in the presence of Lewis acid catalyst or at a temperature close to the boiling point of each monomer, the grafting reaction significantly accelerated even when the relatively low dose was irradiated. Finally, the grafted cPTFE films were sulfonated in a chlorosulfonic acid solution. In spite of the lower ion-exchange capacity (0.75 mmol/g), the membrane synthesized in this study showed a proton conductivity as high as the Nafion 112.
Yamaki, Tetsuya; Kobayashi, Kazuhiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
Polymer, 45(19), p.6569 - 6573, 2004/09
Times Cited Count：56 Percentile：82.67(Polymer Science)We prepared proton exchange membranes by the 
-ray-induced post 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. Under our preparation conditions, the films at the grafting yield of 
30% were found to produce ion exchange membranes with a homogeneous distribution of sulfonic acid groups. The resulting membranes showed a large ion exchange capacity up to 2.9 meq g
, which exceeded the performance of commercially-available perfluorosulfonic acid films such as Nafion; nevertheless, they appeared to be dimensionally stable in water. These should undoubtedly result from the use of the crosslinked PTFE films as graft substrates and make our ion exchange membranes promising for applications to polymer electrolyte fuel cells.
Ito, Yasuo*; F.M.H.Mohamed*; Seguchi, Tadao; *
Radiation Physics and Chemistry, 48(6), p.775 - 779, 1996/00
Times Cited Count：19 Percentile：81.6(Chemistry, Physical)no abstracts in English
Tabata, Yoneho*; *; *; Seguchi, Tadao
Radiation Physics and Chemistry, 48(5), p.563 - 568, 1996/00
no abstracts in English
*; Tabata, Yoneho*; Kudo, Hisaaki; Seguchi, Tadao
Radiation Physics and Chemistry, 45(2), p.269 - 273, 1995/00
Times Cited Count：186 Percentile：99.72(Chemistry, Physical)no abstracts in English
JAERI-M 92-129, 40 Pages, 1992/09
no abstracts in English
JAERI-M 91-054, 44 Pages, 1991/03
no abstracts in English
E.A.Hegazy*; ; A.M.Dessouki*; A.Rabie*;
J.Appl.Polym.Sci., 27, p.535 - 543, 1982/00
Times Cited Count：78 Percentile：95.01(Polymer Science)no abstracts in English
Komaki, Yoshihide; Seguchi, Tadao
Polymer, 23, p.1143 - 1146, 1982/00
Times Cited Count：9 Percentile：51.27(Polymer Science)no abstracts in English
; *; ; *;
Journal of Polymer Science; Polymer Letters Edition, 19, p.599 - 602, 1981/00
no abstracts in English
JAERI-M 8529, 180 Pages, 1979/10
no abstracts in English
; ; ; Machi, Sueo
Journal of Polymer Science; Polymer Chemistry Edition, 17(2), p.503 - 516, 1979/00
no abstracts in English
Machi, Sueo; Yoshida, Kenzo
Genshiryoku Kogyo, 24(10), p.72 - 77, 1978/00
no abstracts in English
; ; ; Machi, Sueo
Journal of Polymer Science; Polymer Chemistry Edition, 16(11), p.2931 - 2944, 1978/00
no abstracts in English
Machi, Sueo; ; ; *;
Radiation Physics and Chemistry, 9, p.403 - 417, 1977/00
no abstracts in English
; Seguchi, Tadao; Takehisa, Masaaki; Machi, Sueo
J.Polym.Sci.,Polym.Phys.Ed., 13(11), p.2183 - 2194, 1975/11
no abstracts in English
Seguchi, Tadao; ; ; Takehisa, Masaaki
J.Polym.Sci.,Polym.Phys.Ed., 12(12), p.2567 - 2576, 1974/12
no abstracts in English
; Takehisa, Masaaki; Machi, Sueo
J.Appl.Polym.Sci., 18(8), p.2249 - 2259, 1974/08
Times Cited Count：13no abstracts in English
Hagiwara, Miyuki; *; *; *; *
Kobunshi Rombunshu, 31(5), p.336 - 340, 1974/05
no abstracts in English
; Seguchi, Tadao; Takehisa, Masaaki; Machi, Sueo
Reports on Progress in Polymer Physics in Japan, 17, p.213 - 216, 1974/00
no abstracts in English
