TY - JOUR
T1 - Synthesis of per-fluorinated polymer-alloy based on PTFE by high temperature EB-irradiation
AU - Oshima, Akihiro
AU - Mutou, Fumihiro
AU - Hyuga, Toshiyuki
AU - Asano, Saneto
AU - Ichizuri, Shogo
AU - Li, Jingye
AU - Miura, Takaharu
AU - Washio, Masakazu
N1 - Funding Information:
The authors acknowledge Dr. E. Katoh and Dr. Y. Numata of National Institute of Agrobiological Science for their helpful and valuable discussions on NMR spectroscopy. The development of the new materials for PEM was supported by projects of “Research and Development of Polymer Electrolyte Fuel Cell” in the New Energy and Industrial Technology Development Organization (NEDO).
PY - 2005/7
Y1 - 2005/7
N2 - In this study, synthesis of per-fluorinated polymer-alloy based on polytetrafluoroethylene (PTFE) has been demonstrated by high temperature irradiation techniques. The per-fluorinated polymer-blend thin films originated from polymer dispersion (PTFE, PTFE/PFA polymer-blend: FA and PTFE/FEP polymer-blend: FE) have been fabricated by the wire-bar coating equipment. The obtained films (thickness: 5-15 μm) were irradiated by EB at 335 °C ± 5 °C in nitrogen gas atmosphere. Characterization of irradiated polymer-blends has been performed by 19F solid-state NMR spectroscopy, thermal analysis and so on. By DSC analysis, the heat of crystallization (ΔHc) of both irradiated polymer-blends were decreased with increase in absorbed dose. Moreover, the melting and crystallization temperatures of both materials shift to lower temperatures, compared with crosslinked PTFE. The obtained materials showed the lower crystallinity. By 19F solid-state NMR spectroscopy, the new signals appeared at around -160 ppm and at -188 ppm. The signals are assigned to the fluorine signals of CF groups, which represent crosslinking sites with Y-type (>CF-) and Y′-type (>CCF-) in the polymer-blend chains. Thus, it is confirmed that the polymer-alloys with good performance based on PTFE are synthesized through the radiation crosslinking reaction between PTFE and PFA or FEP molecules.
AB - In this study, synthesis of per-fluorinated polymer-alloy based on polytetrafluoroethylene (PTFE) has been demonstrated by high temperature irradiation techniques. The per-fluorinated polymer-blend thin films originated from polymer dispersion (PTFE, PTFE/PFA polymer-blend: FA and PTFE/FEP polymer-blend: FE) have been fabricated by the wire-bar coating equipment. The obtained films (thickness: 5-15 μm) were irradiated by EB at 335 °C ± 5 °C in nitrogen gas atmosphere. Characterization of irradiated polymer-blends has been performed by 19F solid-state NMR spectroscopy, thermal analysis and so on. By DSC analysis, the heat of crystallization (ΔHc) of both irradiated polymer-blends were decreased with increase in absorbed dose. Moreover, the melting and crystallization temperatures of both materials shift to lower temperatures, compared with crosslinked PTFE. The obtained materials showed the lower crystallinity. By 19F solid-state NMR spectroscopy, the new signals appeared at around -160 ppm and at -188 ppm. The signals are assigned to the fluorine signals of CF groups, which represent crosslinking sites with Y-type (>CF-) and Y′-type (>CCF-) in the polymer-blend chains. Thus, it is confirmed that the polymer-alloys with good performance based on PTFE are synthesized through the radiation crosslinking reaction between PTFE and PFA or FEP molecules.
KW - DSC
KW - EB
KW - F-NMR
KW - FEP
KW - PFA
KW - PTFE
KW - Polymer-alloy
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U2 - 10.1016/j.nimb.2005.04.054
DO - 10.1016/j.nimb.2005.04.054
M3 - Conference article
AN - SCOPUS:21644467066
SN - 0168-583X
VL - 236
SP - 172
EP - 178
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 - 1-4
T2 - Ionizing Radiation and Polymers Proceedings of the 6th International Symposium on Ionizing Radiation Polymers
Y2 - 25 September 2004 through 30 September 2004
ER -