Journal
EUROPEAN POLYMER JOURNAL
Volume 50, Issue -, Pages 271-278Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2013.11.011
Keywords
Nafion; Ionomer; Cation interaction; Physical properties; Gas transport
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The physical and transport properties of Li+, Na+, K+, and Ca2+ neutralized Nafion were compared to its acid form. Nafion crystallinity was disrupted with a variety of cations while average d-spacing remained constant. Higher thermal stability in metal ion exchanged Nafion was observed using TGA. Ionic interactions were probed by DMA and spectroscopic techniques. Divalent ca(2+) exhibited a distinctive influence on the chain's mobility as compared to monovalent ions. The interaction strength cation exchanged Nafion decreased in the following order: Li+ > Ca2+ > Na+ > K+. Gas permeability increases were primarily attributed to gas solubility. Nafion had a higher gas activation energy E-p, but its permeability was lower than unsulfonated PTFE. (C) 2013 Elsevier Ltd. All reserved.
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