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Journal Articles

Preparation of proton exchange membranes based on crosslinked polytetrafluoroethylene for fuel cell applications

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

Polymer, 45(19), p.6569 - 6573, 2004/09

 Times Cited Count:56 Percentile:82.72(Polymer Science)

We prepared proton exchange membranes by the $$gamma$$-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 $$geq$$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$$^{-1}$$, 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.

Journal Articles

Vacancy spectroscopy of radiation cross-linked and degraded polytetrafluoroethylenes

Ito, Yasuo*; F.M.H.Mohamed*; Seguchi, Tadao; *

Radiation Physics and Chemistry, 48(6), p.775 - 779, 1996/00

 Times Cited Count:19 Percentile:81.64(Chemistry, Physical)

no abstracts in English

Journal Articles

Temperature effects on radiation induced phenomena in polymers

Tabata, Yoneho*; *; *; Seguchi, Tadao

Radiation Physics and Chemistry, 48(5), p.563 - 568, 1996/00

no abstracts in English

Journal Articles

Radiation induced crosslinking of polytetrafluoroethylene

*; Tabata, Yoneho*; Kudo, Hisaaki; Seguchi, Tadao

Radiation Physics and Chemistry, 45(2), p.269 - 273, 1995/00

 Times Cited Count:186 Percentile:99.73(Chemistry, Physical)

no abstracts in English

JAEA Reports

Radiation-Induced Emulsion Polymerization of Tetrafluoro-Ethylene

JAERI-M 8529, 180 Pages, 1979/10

JAERI-M-8529.pdf:6.4MB

no abstracts in English

Journal Articles

Emulsifier-free emulsion polymerization of tetrafluoroethylene by radiation, 5; Effect of reaction conditions on the stability of polytetrafluoroethylene latex

; ; ; Machi, Sueo

Journal of Polymer Science; Polymer Chemistry Edition, 17(2), p.503 - 516, 1979/00

no abstracts in English

Journal Articles

Effect of molecular weight on the crystalline structure of polytetrafluoroethylene as-polymerized

; Seguchi, Tadao; Takehisa, Masaaki; Machi, Sueo

J.Polym.Sci.,Polym.Phys.Ed., 13(11), p.2183 - 2194, 1975/11

no abstracts in English

Journal Articles

Morphology of polytetrafluoroethylene prepared by radiation-induced emulsion polymerization

Seguchi, Tadao; ; ; Takehisa, Masaaki

J.Polym.Sci.,Polym.Phys.Ed., 12(12), p.2567 - 2576, 1974/12

no abstracts in English

Journal Articles

Radiation-induced emulsion polymerization of tetrafluoroethylene

; Takehisa, Masaaki; Machi, Sueo

J.Appl.Polym.Sci., 18(8), p.2249 - 2259, 1974/08

 Times Cited Count:13

no abstracts in English

Journal Articles

An accelerating effect of halogenated methane on the radiation degradation of polytetrafluoroethylene

Hagiwara, Miyuki; *; *; *; *

Kobunshi Rombunshu, 31(5), p.336 - 340, 1974/05

no abstracts in English

Journal Articles

Effect of molecular weight on the melting and crystallization behaviors of as-polymerized polytetrafluoroethylene

; Seguchi, Tadao; Takehisa, Masaaki; Machi, Sueo

Reports on Progress in Polymer Physics in Japan, 17, p.213 - 216, 1974/00

no abstracts in English

Journal Articles

Heat treatment and isothermal crystallization of as-polymerized polytetrafluoroethylene

; Takehisa, Masaaki; Machi, Sueo

Reports on Progress in Polymer Physics in Japan, 17, p.217 - 220, 1974/00

no abstracts in English

Journal Articles

Journal Articles

Molecular motion and structure of unsintered polytetrafluoroethylene, 3; Texture from the measurement of 100 Debye-Scherrer line profiles

;

Reports on Progress in Polymer Physics in Japan, 16, p.231 - 234, 1973/00

no abstracts in English

Journal Articles

Measurements of longitudinal acoustic phonons in polytetra-fluoroethylene

; ; Masaki, N.; ; ; ; Kuriyama, Isamu; ; ; *

Reports on Progress in Polymer Physics in Japan, 15, p.141 - 144, 1972/00

no abstracts in English

16 (Records 1-16 displayed on this page)
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