Phenyl phosphonic acid functionalized poly[aryloxyphosphazenes] as proton-conducting membranes for direct methanol fuel cells

Harry R. Allcock, Michael A. Hofmann, Catherine M. Ambler, Serguei N. Lvov, Xiangyang Zhou, Elena Chalkova, Jamie Weston

Research output: Contribution to journalArticle

149 Scopus citations


A method for the synthesis of phenyl phosphonic acid functionalized poly[aryloxyphosphazene] membranes is described. Membranes of polymers with total ion-exchange capacities between 1.17 and 1.43meq.g-1 were cast from N,N-dimethyl-formamide and found to have proton conductivities between 10-2 and 10-1Scm-1. Equilibrium water swelling values were determined to be between 11 and 32% depending on the polymer structure. Methanol diffusion coefficients for both radiation cross-linked and non-cross-linked membranes in 3M aqueous methanol at 80°C and 2.8bar were found to be at least 12 times lower than for Nafion 117, and 6 times lower than for a radiation cross-linked sulfonated polyphosphazene membrane.

Original languageEnglish
Pages (from-to)47-54
Number of pages8
JournalJournal of Membrane Science
Issue number1-2
StatePublished - May 31 2002
Externally publishedYes



  • Diffusion
  • Direct methanol fuel cells
  • Ion-exchange membranes
  • Polyphosphazenes

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics

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