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Influence of the sulfonate countercation on the thermal stability of nafion perfluorosulfonate membranes†
Article first published online: 11 MAR 2003
Copyright © 1993 John Wiley & Sons, Inc.
Journal of Polymer Science Part B: Polymer Physics
Volume 31, Issue 8, pages 953–957, July 1993
How to Cite
Feldheim, D. L., Lawson, D. R. and Martin, C. R. (1993), Influence of the sulfonate countercation on the thermal stability of nafion perfluorosulfonate membranes. J. Polym. Sci. B Polym. Phys., 31: 953–957. doi: 10.1002/polb.1993.090310805
- Issue published online: 11 MAR 2003
- Article first published online: 11 MAR 2003
- Manuscript Accepted: 15 DEC 1992
- Manuscript Revised: 19 NOV 1992
- Manuscript Received: 3 SEP 1992
- thermal stability;
- perfluorosulfonate ionomers
We report a strong dependence of the thermal stability of Nafion® perfluorosulfonate ionomer on the nature of the counterion associated with the fixed sulfonate site. These results were obtained using thermal gravimetric analysis on a series of alkali metal and alkyl ammonium cation-exchanged Nafion films. We have found that the temperature of decomposition of Nafion is inversely dependent on the size of the exchanged cation; i.e., Nafion films show improved thermal stability as the size of the counter cation decreases. We attribute this inverse relationship of thermal stability with counterion size to an initial decomposition reaction which is strongly influenced by the strength of the sulfonate-coun-terion interaction. © 1993 John Wiley & Sons, Inc.