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

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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

66 Citations (Scopus)


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
Issue number1-4
Publication statusPublished - 2003 Aug
EventIonizing Radiation and Polymers - Sainte-Adele, QUE, Canada
Duration: 2002 Sept 212002 Sept 26


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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