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Crosslinking and alkyl substitution in nano-structured grafted fluoropolymer for use as proton-exchange membranes in fuel cells

descriptionPublicationkeyboard_double_arrow_right Article , Journal 30 Dec 2008 Denmark Publisher:Springer Science and Business Media LLCJournal:Applied Physics A, volume 96, pages 569-573 (issn: 0947-8396, eissn: 1432-0630,

Authors: Larsen, Mikkel Juul; Ma, Yue; Lund, Peter Brilner; Skou, Eivind Morten;

doi: 10.1007/s00339-008-5064-3

Crosslinking and alkyl substitution in nano-structured grafted fluoropolymer for use as proton-exchange membranes in fuel cells

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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.

Country

Denmark

Related Organizations

University of Southern Denmark
Denmark

Keywords

styren, fluoropolymer, ETFE, tert-butylstyren, divinylbenzene, Brændselscelle, membran, polymerelektrolyt, podning, tværbinding, alkylsubstitution, fluorpolymer, ETFE, styren, divinylbenzen, DVB, methylstyren, tert-butylstyren, t-butylstyren, membran, divinylbenzen, methylstyrene, Brændselscelle, crosslinking, polymerelektrolyt, alkyl substitution, membrane, fluorpolymer, alkylsubstitution, DVB, Fuel cell, methylstyren, t-butylstyren, tert-butylstyrene, t-butylstyrene, grafting, tværbinding, Fuel cell, membrane, polymer electrolyte, grafting, crosslinking, alkyl substitution, fluoropolymer, ETFE, styrene, divinylbenzene, DVB, methylstyrene, tert-butylstyrene, t-butylstyrene, styrene, polymer electrolyte, podning

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