The role of a metal ion within Nafion upon its physical and gas transport properties

Yanfang Fan, Drew Tongren, Chris J. Cornelius

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

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 Ca2+ 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 Ep, but its permeability was lower than unsulfonated PTFE.

Original languageEnglish (US)
Pages (from-to)271-278
Number of pages8
JournalEuropean Polymer Journal
Volume50
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • Cation interaction
  • Gas transport
  • Ionomer
  • Nafion
  • Physical properties

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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