Dynamics of PFSA polymer hydration measured in situ by SAXS.

  • Yandrasits M
  • Aieta N
  • Stanis R
  • et al.
ISSN: 1521-4648
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Abstract

The proton exchange membrane (PEM) fuel cell is potentially one of the most versatile and efficient energy conversion devices currently being developed. The PEM in low temp. fuel cells is currently a perfluorosulfonic acid polymer (PFSA) that must be fully hydrated to achieve practical proton cond. We decided to measure the hydration dynamics of these membranes using synchrotron x-rays. Small angle X-ray scattering (SAXS) was chosen as these membranes show a strong peaks due both the hydrophobic region, the matrix knee, and the hydrophilic domains, the so called ionomer peak. We have shown that the shorter chain PFSA ionomers appear to have more cryst. hydrophobic regions and that the rate of hydration of these membranes is on the order of minutes rather than seconds. There is a limit to the practical EW at which point the materials become gels and presumably have little structural integrity. [on SciFinder(R)]

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APA

Yandrasits, M. A., Aieta, N., Stanis, R. J., Hamrock, S. J., Cookson, D. J., & Herring, A. M. (2006). Dynamics of PFSA polymer hydration measured in situ by SAXS. Preprints of Symposia - American Chemical Society, Division of Fuel Chemistry, 51(2), 608–609.

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