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Thermal characterization of Flemion® membranes substituted by alkali metal cations

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Abstract

The thermal behavior of perfluorosulfonated membranes of three equivalent mass (EW=910, 1000 and 1100 g eq−1) has been studied for membranes in acid form and in the alkali metal countercations substituted samples. The water contents of the membranes decrease progressively with increasing EW and the countercations charge density. The monovalent cations substitutions increase the membranes thermal stability. DSC curves show a single endothermic peak around 120°C that give low peak temperature for low EW and high peak temperature for large cations size. The membrane mechanical properties changed for different EW and temperatures of membranes. Stress-strain analysis showed that K+ substituted membranes at both temperatures present a highest YM compared to the other alkali cation substitutions. The thermal properties of perfluorosulfonated membranes depend on the water contents, cation size, temperature and also on EW value.

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Authors and Affiliations

  1. Instituto de Química, Universidade de São Paulo, Mail Box 26077, 05599-970, São Paulo, Brazil

    W. M. Grava & Y. Kawano

  2. National Institute of Advanced Industrial Science and Technology, Higashi 1-1-1, Central 5, Tsukuba, Ibaraki, 305-8565, Japan

    T. Okada

Authors
  1. W. M. Grava
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  2. T. Okada
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  3. Y. Kawano
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Correspondence to Y. Kawano.

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Grava, W.M., Okada, T. & Kawano, Y. Thermal characterization of Flemion® membranes substituted by alkali metal cations. J Therm Anal Calorim 89, 163–168 (2007). https://doi.org/10.1007/s10973-006-7515-4

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  • DOI: https://doi.org/10.1007/s10973-006-7515-4

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