Interplay between 'alfa'-relaxation and morphology transition of perfluorosulfonate ionomer membranes
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Journal of Power Sources
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Nafion a-relaxation is the subject of intense investigations as it regulates the performance of electric
actuators and polymer electrolyte fuel cells. Dielectric spectroscopy and atomic force microscopy measurements of Nafion membranes allow identifying the conformation transition of the polymeric aggregates as the process underlying the a-transition. The dielectric permittivity curves of Nafion membranes
show that for relative humidity higher than ~60% and for temperatures higher than ~120 C, the arelaxation displaces to lower frequencies. Such unusual behavior is attributed to an elongation of Nafion
polymeric aggregates occurring at high temperatures (T > 120 C) and is in perfect agreement with
morphological changes inferred from atomic force microscopy analyses.
Como referenciar
MATOS, BRUNO R.; SANTIAGO, ELISABETE I.; MUCCILLO, REGINALDO; VELASCO-DAVELOS, IVAN A.; RUEDIGER, ANDREAS; TAVARES, ANA C.; FONSECA, FABIO C. Interplay between 'alfa'-relaxation and morphology transition of perfluorosulfonate ionomer membranes. Journal of Power Sources, v. 293, p. 859-867, 2015. DOI: 10.1016/j.jpowsour.2015.05.122. Disponível em: http://repositorio.ipen.br/handle/123456789/23845. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.