Infrared study of the effects of hydration on cation-loaded Nafion thin films

Renée M. Blanchard, Ralph G. Nuzzo

Research output: Contribution to journalArticle

Abstract

We explore the effects of hydration on the vibrational spectra of cation-exchanged Nafion thin films. In addition to the initial H+ form of the membrane, the cations selected for study include: Na+, NH4+, tetramethylammonium, tetrabutylammonium, hexadecyltrimethylammonium, and tris(2,2′-bipyridine)osmium(II). A flow cell is used to follow the changes occurring in a 1000-angstroms film in response to variations in the humidity of a nitrogen purge gas flowing through the cell. The structural changes occurring due to the binding of water to these cation-exchanged membranes is followed across a broad range of water contents with IR difference spectroscopy. Our results demonstrate a complex role for water in mediating the polyanion-cation interactions. Side-chain reconstructions may play an important role in the ion-binding and transport properties of the ionomer domains.

Original languageEnglish (US)
Pages (from-to)1512-1520
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume38
Issue number11
DOIs
StatePublished - Jun 1 2000

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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