Coupling of mechanical and transport properties in Nafion®

Jay Burton Benziger, M. Barclay Satterfield, Paul Majsztrik, Andrew Bruce Bocarsly

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Water sorption and permeation involve interfacial mass transport, diffusion and polymer swelling. The limiting transport resistance changes from interfacial transport at the membrane/vapor interface to diffusion when there is a membrane/liquid interface. Water absorption into Nafion is initially limited by interfacial mass transport; above critical water content water sorption is limited by polymer relaxation dynamics associated with swelling. The dynamics of water absorption show that at room temperature it takes more than 105 s for Nafion to equilibrate to changes in water activity. The elastic modulus and creep rate of Nafion show complex dependence on water activity and temperature. The elastic modulus goes through a maximum and creep rate goes through a minimum at intermediate water activity that depends on temperature. At room temperature water plasticizes Nafion while above 80°C water stiffens Nafion. We shall relate mechanical and transport properties to the structure of Nafion and their implications for PEM fuel cell operation.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
StatePublished - Dec 1 2009
Event238th National Meeting and Exposition of the American Chemical Society, ACS 2009 - Washington, DC, United States
Duration: Aug 16 2009Aug 20 2009

Other

Other238th National Meeting and Exposition of the American Chemical Society, ACS 2009
CountryUnited States
CityWashington, DC
Period8/16/098/20/09

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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  • Cite this

    Benziger, J. B., Barclay Satterfield, M., Majsztrik, P., & Bocarsly, A. B. (2009). Coupling of mechanical and transport properties in Nafion®. In American Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers