Polarization-diffusion effect on the dispersion of N- and α-dielectric relaxation modes

S.I. Hernández and L.F. del Castillo

Physica A: Statistical Mechanics and its Applications, 2007, vol. 377, issue 2, 531-544

Abstract: In this paper, the contribution of polarization diffusion on the dispersion of the electric susceptibility in polymeric materials, that exhibits normal (N-) relaxation at low frequencies and segmental or alpha (α-) relaxation at high frequencies, is studied. Polarization diffusion is locally established when the viscoelastic relaxation couples to the relaxation of a dipolar system. In order to formulate this diffusion process, it was proposed a physical description based on a system of two coupled equations to express the viscoelastic and dielectric relaxations, and the coupling between them is introduced by considering spatial inhomogeneities. The complex polarization-diffusion coefficient and the wave number as frequency function are obtained considering two parameters, which were evaluated using a diffusive model for the N- and α-dielectric modes, respectively, for several polymeric systems.

Keywords: Polarization diffusion; Normal relaxation; Alpha relaxation; Polymers (search for similar items in EconPapers)
Date: 2007
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:377:y:2007:i:2:p:531-544

DOI: 10.1016/j.physa.2006.11.026

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