The stress relaxation and proton conductivity of Nafion 117 membrane (N117-H) and sulfonated poly(arylene ether sulfone) copolymer membrane with 35% sulfonation (BPSH35) in acid forms were investigated under uniaxial loading conditions. The results showed that when the membranes were stretched, their proton conductivities in the direction of the strain initially increased compared to the unstretched films. The absolute increases in proton conductivities were larger at higher temperatures. It was also observed that proton conductivities relaxed exponentially with time at . In addition, the stress relaxation of N117-H and BPSH35 films under both atmospheric and an immersed (in deionized water) condition was measured. The stresses were found to relax more rapidly than the proton conductivity at the same strains. An explanation for the above phenomena is developed based on speculated changes in the channel connectivity and length of proton conduction pathway in the hydrophilic channels, accompanied by the rotation, reorientation, and disentanglements of the polymer chains in the hydrophobic domains.
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October 2006
Research Papers
Relaxation of Proton Conductivity and Stress in Proton Exchange Membranes Under Strain
Dan Liu,
danl@vt.edu
Dan Liu
Macromolecular Science and Engineering, Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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Michael A. Hickner,
Michael A. Hickner
Department of Chemical and Biological Systems,
mahickn@sandia.gov
Sandia National Laboratories
, Albuquerque, NM 87123
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Scott W. Case,
Scott W. Case
Engineering Science and Mechanics, Virginia Polytechnic Institute and
scase@exchange.vt.edu
State University
, Blacksburg, VA 24061
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John J. Lesko
John J. Lesko
Engineering Science and Mechanics, Virginia Polytechnic Institute and
jlesko@exchange.vt.edu
State University
, Blacksburg, VA 24061
Search for other works by this author on:
Dan Liu
Macromolecular Science and Engineering, Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061danl@vt.edu
Michael A. Hickner
Department of Chemical and Biological Systems,
Sandia National Laboratories
, Albuquerque, NM 87123mahickn@sandia.gov
Scott W. Case
Engineering Science and Mechanics, Virginia Polytechnic Institute and
State University
, Blacksburg, VA 24061scase@exchange.vt.edu
John J. Lesko
Engineering Science and Mechanics, Virginia Polytechnic Institute and
State University
, Blacksburg, VA 24061jlesko@exchange.vt.edu
J. Eng. Mater. Technol. Oct 2006, 128(4): 503-508 (6 pages)
Published Online: June 6, 2006
Article history
Received:
July 29, 2005
Revised:
June 6, 2006
Citation
Liu, D., Hickner, M. A., Case, S. W., and Lesko, J. J. (June 6, 2006). "Relaxation of Proton Conductivity and Stress in Proton Exchange Membranes Under Strain." ASME. J. Eng. Mater. Technol. October 2006; 128(4): 503–508. https://doi.org/10.1115/1.2345441
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