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

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

    Research output: Contribution to journalArticle

    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

    Fingerprint

    polytetrafluoroethylene
    Polytetrafluoroethylene
    Polytetrafluoroethylenes
    Electrolytes
    electrolytes
    membranes
    Membranes
    Radiation
    radiation
    Styrene
    styrenes
    crosslinking
    Crosslinking
    monomers
    Monomers
    mechanical properties
    Mechanical properties
    Sulfonation
    Proton exchange membrane fuel cells (PEMFC)
    fuel cells

    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

    Cite this

    Study on poly-electrolyte membrane of crosslinked PTFE by radiation-grafting. / Sato, Kohei; Ikeda, Shigetoshi; Iida, Minoru; Oshima, Akihiro; Tabata, Yoneho; Washio, Masakazu.

    In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 208, No. 1-4, 08.2003, p. 424-428.

    Research output: Contribution to journalArticle

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    AB - 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.

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