Highly selective proton conductive networks based on chain-end functionalized polymers with perfluorosulfonate side groups

Kui Xu, Chalathorn Chanthad, Michael Anthony Hickner, Qing Wang

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

The copolymers of vinylidene fluoride and perfluoro(4-methyl-3,6-dioxane-7- ene) sulfonyl fluoride containing amino end-groups were synthesized for the first time. The prepared amino-terminated polymers underwent cross-linking reactions with 1,3,5-benzene triisocyanate to form proton conductive networks. The prepared membranes exhibited excellent thermal, hydrolytic and oxidative stabilities. The ion exchange capacity, water uptake, the state of absorbed water, and transport properties of the membranes were found to be highly dependent upon the chemical composition of the copolymers. The cross-linked membranes showed extremely low methanol permeability, while maintaining high proton conductivity at the same order of magnitude as Nafion. This unique transport feature gave rise to exceedingly higher electrochemical selectivity in relation to Nafion. The selectivity characteristics have been rationalized based on the formation of restrained ionic domains and the state of the absorbed water within the membranes.

Original languageEnglish (US)
Pages (from-to)6291-6298
Number of pages8
JournalJournal of Materials Chemistry
Volume20
Issue number30
DOIs
StatePublished - Aug 14 2010

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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