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Interplay between α-relaxation and morphology transition of perfluorosulfonate ionomer membranes

Matos, Bruno R. ; Santiago, Elisabete I. ; Muccillo, Reginaldo ; Velasco-Davalos, Ivan A. ; Ruediger, Andreas ; Tavares, Ana C. ; Fonseca, Fabio C.

Journal of power sources, 2015-10, Vol.293, p.859-867 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Interplay between α-relaxation and morphology transition of perfluorosulfonate ionomer membranes
  • Autor: Matos, Bruno R. ; Santiago, Elisabete I. ; Muccillo, Reginaldo ; Velasco-Davalos, Ivan A. ; Ruediger, Andreas ; Tavares, Ana C. ; Fonseca, Fabio C.
  • Assuntos: Conformation transition ; Ionomers ; Microstructure ; Morphology ; Polymer electrolyte fuel cells
  • É parte de: Journal of power sources, 2015-10, Vol.293, p.859-867
  • Descrição: Nafion α-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 α-transition. The dielectric permittivity curves of Nafion membranes show that for relative humidity higher than ∼60% and for temperatures higher than ∼120 °C, the α-relaxation 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. [Display omitted] •Above α-transition electrostatic repulsions trigger conformation changes in Nafion.•Below α-transition the motion of polymer chains is restricted by dipolar attraction.•The dynamics of α-transition corresponds to a conformation transition of Nafion.•AFM and DS confirm a conformation transition of Nafion polymeric aggregates.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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