Study on poly-electrolyte membrane of crosslinked PTFE by radiation-grafting

Kohei Sato, Shigetoshi Ikeda, Minoru Iida, Akihiro Oshima, Yoneho Tabata, Masakazu Washio

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    63 Citations (Scopus)

    Abstract

    Polymer electrolyte fuel cell membrane based on crosslinked polytetrafluoroethylene (PTFE) [RX-PTFE] has been processed by radiation-grafting with reactive styrene monomers by γ-rays under atmospheric circumstances, and the characteristic properties of the obtained membranes have been studied. The grafting yields of styrene monomer onto RX-PTFE, which have various crosslinking densities, were in the range of 5-100%. At the reaction period of 24 h, the grafting yields for RX-PTFE with low crosslinking density, which was reacted at 60 °C, achieved 94%. As a tendency, the lower grafting temperature gives higher grafting ratio of styrene onto RX-PTFE. Moreover, the yields of subsequent sulfonation for all samples were close to 100%. Mechanical properties were decreased with increasing grafting yields; especially the membrane with higher grafting yields was brittle. Ion exchange capacity of sulfonated RX-PTFE reached 1.1 meq/g while maintaining the mechanical properties.

    Original languageEnglish
    Pages (from-to)424-428
    Number of pages5
    JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
    Volume208
    Issue number1-4
    DOIs
    Publication statusPublished - 2003 Aug

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    Keywords

    • Crosslinked PTFE
    • Poly-electrolyte membrane
    • Polymer electrolyte fuel cell
    • Radiation-grafting
    • Styrene monomer

    ASJC Scopus subject areas

    • Surfaces, Coatings and Films
    • Instrumentation
    • Surfaces and Interfaces

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