Abstract
The analyst of the thermally stimulated depolarization current (TSDC) spectrum of theα phase of polyvinilide fluoride (PVDF-α) by means of the thermal sampling technique permits a series of elementary peaks to b8 obtained. The relaxation associated withγ andβ transitions is usually assumed to be due to dipolar motions; however, the relaxation time of these processes when represented as a function of the temperature does not follow an Arrhenius law. The definition of a relaxation time describing the experimental relaxation process requires, in addition to the frequency factor 1/τ0 and the activation energyE, a third parameter,q, which we call the interaction parameter. These considerations lead to defining a relaxation time, which accounts for the dipolar interaction during the relaxation. This relaxation time has successfully described thedipo!orrelaxation in other materials. The evolution ofq, obtained from the elementary peaks of the TSDC spectrum of PVDF-α, leads to the assignment of three relaxation zones, which are in agreement with those reported by other authors, as being associated with the molecular motion in the different phases of PVDF-α.
Published Version
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