Thermal depolarization current (TDC) has been measured to study the effect of a polymer-filler interface on the behavior of carriers in composites of epoxy resin containing mica flakes. Three peaks near 152 (αC), 106 (βC), and 84 °C (γC) are observed in the composites. The origins of these TDC peaks were investigated. The βC peak can be attributed to dipole orientation polarization associated with the glass transition of resin matrix. The αC and γC peaks depend on the fraction of mica flakes. It is assumed that the γC peak arises from dipole polarization associated with molecular motion in boundary regions between the resin matrix and mica flakes. The behavior of the αC peak is different from that of TDC due to dipole polarization. A large dielectric dispersion corresponding to the αC peak is observed near 60 Hz at 183 °C. The large dielectric increment can be explained by Maxwell-type interfacial polarization.
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Tanaka et al. (1977) studied this question.
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