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

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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

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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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