TY - JOUR
T1 - Study on chemical structures of poly (tetrafluoroethylene-co-perfluoroalkylvinylether) by soft-EB irradiation in solid and molten state
AU - Kakigi, Tomoyuki
AU - Oshima, Akihiro
AU - Miyoshi, Nozomi
AU - Murata, Katsuyoshi
AU - Fujii, Kazuki
AU - Mitani, Naohiro
AU - Urakawa, Tatsuya
AU - Sato, Yukiko
AU - Matsuura, Akio
AU - Li, Jingye
AU - Miura, Takaharu
AU - Katoh, Etsuko
AU - Washio, Masakazu
PY - 2007/12
Y1 - 2007/12
N2 - 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.
AB - 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.
KW - DSC
KW - F MAS NMR
KW - PFA
KW - Soft-EB
KW - Tertiary carbon
KW - Y-type crosslinking
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U2 - 10.1016/j.nimb.2007.08.036
DO - 10.1016/j.nimb.2007.08.036
M3 - Article
AN - SCOPUS:36049009359
SN - 0168-583X
VL - 265
SP - 118
EP - 124
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1
ER -