Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 201, Issue 1-2, Pages 47-54Publisher
ELSEVIER
DOI: 10.1016/S0376-7388(01)00702-5
Keywords
ion-exchange membranes; polyphosphazenes; diffusion; direct methanol fuel cells
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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 1.43 meq. g(-1) were cast from N,N-dimethyl-formamide and found to have proton conductivities between 10(-2) and 10(-1) S cm(-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 3 M aqueous methanol at 80 degreesC and 2.8 bar 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. (C) 2002 Published by Elsevier Science B.V.
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