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α-Relaxation and Morphology Transition of Perfluorosulfonate Ionomer Membranes

Published online by Cambridge University Press:  27 February 2015

B. R. Matos ,
E. I. Santiago ,
R. Muccillo ,
I. A. Velasco-Davalos ,
A. Ruediger ,
A. C. Tavares  and
F. C. Fonseca
B. R. Matos
Affiliation:
Nuclear and Energy Research Institute - IPEN, São Paulo, SP, 05508000, Brazil.
E. I. Santiago
Affiliation:
Nuclear and Energy Research Institute - IPEN, São Paulo, SP, 05508000, Brazil.
R. Muccillo
Affiliation:
Nuclear and Energy Research Institute - IPEN, São Paulo, SP, 05508000, Brazil.
I. A. Velasco-Davalos
Affiliation:
Institut National de la Recherche Scientifique, Varennes, Quebec, J3X 1S2, Canada.
A. Ruediger
Affiliation:
Institut National de la Recherche Scientifique, Varennes, Quebec, J3X 1S2, Canada.
A. C. Tavares
Affiliation:
Institut National de la Recherche Scientifique, Varennes, Quebec, J3X 1S2, Canada.
F. C. Fonseca
Affiliation:
Nuclear and Energy Research Institute - IPEN, São Paulo, SP, 05508000, Brazil.
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Abstract

Nafion α-relaxation has been the subject of intense investigations as it regulates the performance of electric actuators and polymer electrolyte fuel cells (PEMFC). Dielectric spectroscopy and atomic force microscopy (AFM) measurements of Nafion membranes allowed identifying the conformation transition of the polymeric aggregates as the process underlying the α-transition. The dielectric permittivity curves of Nafion showed that for temperatures T > 120 °C, the α-relaxation displaces to lower frequencies. Such unusual behavior was attributed to an elongation of Nafion polymeric aggregates occurring at T ∼ 120 °C and is in agreement with both water uptake measurements and morphological changes inferred from AFM analyses.

Keywords

dielectric propertiesionic conductorpolymer
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1735: Symposium S/W/CC – Advanced Materials for Photovoltaic, Fuel Cell and Electrolyzer, and Thermoelectric Energy Conversion , 2015 , mrsf14-1735-s05-03
Copyright
Copyright © Materials Research Society 2015 

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References

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