Study on chemical structures of poly (tetrafluoroethylene-co-perfluoroalkylvinylether) by soft-EB irradiation in solid and molten state

Tomoyuki Kakigi, Akihiro Oshima*, Nozomi Miyoshi, Katsuyoshi Murata, Kazuki Fujii, Naohiro Mitani, Tatsuya Urakawa, Yukiko Sato, Akio Matsuura, Jingye Li, Takaharu Miura, Etsuko Katoh, Masakazu Washio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Poly (tetrafluoroethylene-co-perfluoroalkylvinylether) (PFA) was irradiated by soft electron beam (soft-EB) under nitrogen gas atmosphere in solid-state and its molten state, respectively. The changes of thermal property and chemical structures of irradiated PFA in solid-state and molten state were studied by differential scanning calorimetric analysis (DSC) and solid-state 19F magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. By DSC analysis, the melting temperature shifted to lower temperatures, and crystallinity decreased with increasing soft-EB dose. By solid-state 19F MAS NMR spectroscopy, the new signals was observed and the detected new signals in irradiated PFA at 315 °C and at 30 °C were due to the tertiary carbon group with branching site (Y-type crosslinking site), perfluoro-propylene site and chain end methylene groups, respectively. Moreover, the molar ratio of perfluoroalkylvinylether (FAVE) structure to -CF2- units decreased with increasing dose.

Original languageEnglish
Pages (from-to)118-124
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume265
Issue number1
DOIs
Publication statusPublished - 2007 Dec 1

Keywords

  • DSC
  • F MAS NMR
  • PFA
  • Soft-EB
  • Tertiary carbon
  • Y-type crosslinking

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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