Structure-property relationships between eco-friendly epoxy resin and hardener for gas insulated switchgear

초록

Thermal and mechanical properties of epoxy composites are strongly dependent on the crosslink density of epoxy which can be modified by the types and contents of epoxy hardeners. In this study, we manufactured eco-friendly epoxy composites with fillers for gas insulated switchgear application by a polymer mixer (kneader) and developed the structure-property relationships by investigating crosslink density and thermal properties with various types of hardeners. Thermal properties of the epoxy composites were investigated by differential scanning calorimetry (DSC), dynamic mechanical analyzer (DMA), heat distortion tester (HDT), laser flash analysis (LFA), and thermogravimetric analysis (TGA) in order to measure the glass transition temperature, coefficient of thermal expansion, heat distortion temperature, thermal conductivity and thermal degradation temperature. In particular, the crosslink density of epoxy composites was measured through DMA. We also measured the viscosity of the composites to investigate the dispersity of the fillers to correlate dispersion of the fillers and thermal properties of the composites. Based on the structure-property relationships according to the hardener types, we will discuss optimum type of a hardener and the chemical composition of the epoxy composites for the gas insulated switchgear.