Polymer nanocomposite has been attracting more attention as a new insulation material because homogeneous dispersion of nano-sized inorganic fillers can improve various properties significantly. In this paper, various kinds of epoxy-based nanocomposites were made, and the AC breakdown strengths of Nano filler and micro-SiO 2 filler mixtures of epoxy-based composites were analyzed using sphere-to-sphere electrodes. Moreover, nano-and microfiller combinations were investigated as an approach to practical application of nanocomposite insulation materials. Its composition ratio was 100 (resin):82 (hardener):1.5 (accelerator). AC breakdown tests were performed at room temperature (25°C), 80°C, and 100°C in the vicinity of T g (90°C). Thermal conductivity was measured using TC-30.
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