Origin of α and β relaxations of Nafion

B. R. Matos, E. I. Santiago, J. F. Q. Rey, and F. C. Fonseca
Phys. Rev. E 89, 052601 – Published 19 May 2014

Abstract

Our experiments disentangle the low and high frequency dispersions in perfluorosulfonate ionomer solutions and membranes, providing a reasonable model for understanding these relaxations. Dielectric spectroscopy (DS) and small angle x-ray scattering (SAXS) measurements revealed that the dielectric relaxations observed at low (α relaxation) and high (β relaxation) frequencies show typical features of the longitudinal and radial polarization, respectively, of rodlike polymeric aggregates. Such relaxations were attributed to counterion fluctuations in the vicinity of sulfonic acid groups, in resemblance with polyelectrolytes. Characteristic correlation lengths calculated from both DS and SAXS data are in good agreement adding further evidence to the proposed model. Such description provides insights for the understanding of the crossover from polyelectrolytes, dominated by charge repulsion, to ionomers, dominated by dipolar attraction.

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  • Received 19 December 2013
  • Revised 26 February 2014

DOI:https://doi.org/10.1103/PhysRevE.89.052601

©2014 American Physical Society

Authors & Affiliations

B. R. Matos1,*, E. I. Santiago1, J. F. Q. Rey2, and F. C. Fonseca1

  • 1Instituto de Pesquisas Energéticas e Nucleares, IPEN, São Paulo, SP, Avenida Lineu Prestes, 2242, 05508000, Brazil
  • 2Universidade Federal do ABC, UFABC, Santo André, SP, Avenida dos Estados, 5001, 09219170, Brazil

  • *brmatos@usp.br

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Vol. 89, Iss. 5 — May 2014

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