Crosslinking and alkyl substitution in nano-structured grafted fluoropolymer for use as proton-exchange membranes in fuel cells |
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Authors: | Mikkel Juul Larsen Yue Ma Peter B Lund and Eivind M Skou |
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Institution: | (1) Institute of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Niels Bohrs Allé 1, 5230 Odense M, Denmark;(2) IRD Fuel Cells A/S, Kullinggade 31, 5700 Svendborg, Denmark |
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Abstract: | In order to develop cheaper and better fuel-cell electrolyte membranes than the polyperfluorosulfonic acids, an effort has
been made to improve the fuel-cell relevant properties of sulfonated styrene/divinylbenzene-grafted poly(ethylene-alt-tetrafluoroethylene) membranes. Thus the influence of the crosslinking agent divinylbenzene has been investigated and its
amount optimized. Substitution of styrene by methylstyrene and t-butylstyrene has been performed with the purpose of improving the chemical stability of the membranes. Grafting with a fraction
of divinylbenzene in the order of 1–2 vol-% of the total monomers has been found to be the best compromise between high grafting
yield, good chemical stability, and high proton conductivity of the final membrane. The use of methylstyrene and t-butylstyrene as grafting monomers instead of styrene results in substantially increased chemical stability, with reasonable
proton conductivity still being possible to obtain. |
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Keywords: | PACS" target="_blank">PACS 82 35 Cd 82 45 Gj 82 45 Wx 82 47 Gh 82 47 Nj |
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