Dielectric relaxation and dc conductivity on the PVOH-CF3COONH4 polymer system

José Castillo

Resultado de la investigación: Contribución a una revistaArtículo

12 Citas (Scopus)

Resumen

In the present paper, the ionic conductivity and the dielectric relaxation properties on the poly(vinyl alcohol)-CF3COONH4polymer system have been investigated by means of impedance spectroscopy measurements over wide ranges of frequencies and temperatures. The electrolyte samples were prepared by solution casting technique. The temperature dependence of the sample's conductivity was modeled by Arrhenius and Vogel-Tammann-Fulcher (VTF) equations. The highest conductivity of the electrolyte of 3.41×10-3(Ωcm)-1was obtained at 423 K. For these polymer system two relaxation processes are revealed in the frequency range and temperature interval of the measurements. One is the glass transition relaxation (α-relaxation) of the amorphous region at about 353 K and the other is the relaxation associated with the crystalline region at about 423 K. Dielectric relaxation has been studied using the complex electric modulus formalism. It has been observed that the conductivity relaxation in this polymer system is highly non-exponential. From the electric modulus formalism, it is concluded that the electrical relaxation mechanism is independent of temperature for the two relaxation processes, but is dependent on composition. © Springer-Verlag 2009.
Idioma originalEspañol (Colombia)
Páginas (desde-hasta)537-544
Número de páginas8
PublicaciónIonics
Volumen15
N.º5
DOI
EstadoPublicada - sep 2009

Palabras clave

  • Dielectrical relaxation
  • Phase behavior
  • Polymer electrolyte

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