TY - JOUR
T1 - Fabrication of PEFC membrane based on PTFE/FEP polymer-alloy using radiation-grafting
AU - Asano, Saneto
AU - Mutou, Fumihiro
AU - Ichizuri, Shogo
AU - Li, Jingye
AU - Miura, Takaharu
AU - Oshima, Akihiro
AU - Katsumura, Yosuke
AU - Washio, Masakazu
N1 - Funding Information:
The authors acknowledge Prof. Y. Hama, and Dr. T. Oka of Waseda University for FT-IR experiments. The authors wish to thank S. Ikeda and M. Iida of RAYTECH Corporation. The development of the new PEM using crosslinked fluorinated polymer was supported by projects of “Research and Development of Polymer Electrolyte Fuel Cell” in the New Energy and Industrial Technology Development Organization (NEDO).
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/7
Y1 - 2005/7
N2 - Polymer electrolyte fuel cells (PEFC) membranes based on very thin film of network polytetrafluoroethylene (PTFE)/tetrafluoroethylene-co-hexafluoropropylene (FEP) polymer-alloy (PTFE/FEP polymer-alloy: FE), have been fabricated by radiation-grafting with reactive styrene monomers using electron beam irradiation (EB) under nitrogen atmosphere at room temperature. The characteristic properties of obtained materials have been measured by ion exchange capacity (IEC), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), and so on. The grafting yields showed the initial rapid increase, and then tended to saturate above 5-8 h. The grafting yields of all FE with various network densities have been achieved 80-100%. The styrene-grafted materials were sulfonated by chlorosulfonic acid. The IECs of sulfonated materials based on FE polymer-alloy have been achieved 3.0 meq/g. This suggests that IEC value is independent on network density and PTFE/FEP blend ratio. The IEC values of obtained materials are about three times higher than those of commercial perfluoro-sulfonic acid (PFSA) membranes. By small angle X-ray scattering (SAXS), it is found that the higher network densities would give the smaller cluster sizes in sulfonated materials. Thus, the higher amount of FEP will give the smaller cluster formation of sulfonated materials.
AB - Polymer electrolyte fuel cells (PEFC) membranes based on very thin film of network polytetrafluoroethylene (PTFE)/tetrafluoroethylene-co-hexafluoropropylene (FEP) polymer-alloy (PTFE/FEP polymer-alloy: FE), have been fabricated by radiation-grafting with reactive styrene monomers using electron beam irradiation (EB) under nitrogen atmosphere at room temperature. The characteristic properties of obtained materials have been measured by ion exchange capacity (IEC), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), and so on. The grafting yields showed the initial rapid increase, and then tended to saturate above 5-8 h. The grafting yields of all FE with various network densities have been achieved 80-100%. The styrene-grafted materials were sulfonated by chlorosulfonic acid. The IECs of sulfonated materials based on FE polymer-alloy have been achieved 3.0 meq/g. This suggests that IEC value is independent on network density and PTFE/FEP blend ratio. The IEC values of obtained materials are about three times higher than those of commercial perfluoro-sulfonic acid (PFSA) membranes. By small angle X-ray scattering (SAXS), it is found that the higher network densities would give the smaller cluster sizes in sulfonated materials. Thus, the higher amount of FEP will give the smaller cluster formation of sulfonated materials.
KW - Polymer-alloy
KW - Pre-irradiation induced graft polymerization
KW - Proton exchange membrane
KW - Styrene
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U2 - 10.1016/j.nimb.2005.04.015
DO - 10.1016/j.nimb.2005.04.015
M3 - Conference article
AN - SCOPUS:21644433290
SN - 0168-583X
VL - 236
SP - 437
EP - 442
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 -