Temperature variation of dielectric loss of silver-thermosetting polyester composites at audio frequencies

Abstract

Dielectric loss of a metallopolymer system consisting of silver-coated glass spheres dispersed in unsaturated polyester is investigated at audio frequencies in the temperature range −180 to 45° C. The effect of the conductive filler is generally an enhancement of the dielectric loss due to the polymr matrix and no new loss peak is observed, and the activation energy for the β-relaxation remains unaffected. It has also been found that dielectric dispersions corresponding to various filler concentrations appear to possess identical shapes in a pseudo Cole-Cole plot and that the loss maxima are collinear.[/p]