ミクロ不均質構造への最新アプローチ 表面フッ素化カーボンブラック充てんポリマーの電気的および力学的性質

Abstract

The effect of surface fluorination of carbon black (CB) on the electrical and mechanical properties of CB filled polymer composite was studied in this work. By immersion heat measurement, it was found that the London dispersive component (γd) of surface energy significantly decreased with increasing the fluorine content, while the polar component (γp) slightly increased. The resistivity measurement of fluorinated CB filled resin composite showed that by increasing the fluorine content, the percolation threshold increased, and transition from insulated state to conductive state was decelerated. The dynamic mechanical analysis (DMA) of epiclorohydrin-ethylene oxide-allylglycidyl ether (CHR) filled fluorinated CB composite illustrated that the interfacial interaction parameter (B) and immobilized polymer layer thickness (ΔR) decreased with increasing the fluorine content. The Maxwell-Wagner-Sillars (MWS) relaxation peak accompanied by migration of the charge carriers accumulated at interface between CHR and CB was observed at higher than glass transition temperature (Tg) of CHR. The activation energy (EaMWS) of MWS relaxation was decreased with increasing the fluorine content. It was found that B and ΔR estimated from DMA was well agreed with the EaMWS estimated from dielectric measurement.