Electric conductivity of polymer composites at mechanical relaxation

Abstract

Effects of mechanical relaxations on the relaxation phenomena of electrical conducting polymer composites (ECPC) have been investigated. It is experimentally shown that filler content significantly affectsrelaxation characteristics of the material. The main reason of these differences is the effect of the filler type on proceeding of relaxational processes. Rubbers with active carbon blacksdisplay the ranges of slow and fast relaxations much more clearly, than those with low active carbon blacks even at increased concentrations in increase of the rubber elasticity modulus with the increase of the filler concentration. The effect of the filler type is displayed by formation of an interphase layer and is similar to the effect of the filler content. In the case of active carbon blacks, the increase of the filler-filler and polymer-filler interactions is balanced by high content of low active carbon blacks, because in both cases the modulus of the material and internal friction in relaxation processes grow.