Effect of Zinc Oxide Blend on Dielectric Responses of Family Cold Curing Polyurethanes

Abstract

A experimental study of the dielectric properties of polyurethane and its mixtures containing 1% weight Zinc Oxide (ZnO) is presented. We used two types of two-component polyurethanes of the same class (VUKOL O22 and VUKOL N22) as a basic matrix for nanoparticles. A different chemical composition of polyurethanes and influence of nanoparticles affected polymer segmental dynamics. In both types of polymers decrease of real permittivity with additions of ZnO was observed due to a lower mobility of polymer chains connected to nanoparticles. Lower dielectric losses are associated with the lower relative permittivity. In frequency spectra of dissipation factor were observed local relaxation peaks, which shift to higher frequency with temperature.