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Dielectric Properties of Carbon Black–Epoxy Resin Composites Studied with Impedance Spectroscopy

Abstract Dielectric properties of carbon black–epoxy resin composites were studied in the frequency range between 100 Hz and 15 MHz and over a temperature range 23–98°C. The results show that the composites exhibit, below the critical concentration, a dielectric relaxation phenomenon due to dipolar groups of epoxy resin and to interfacial polarization. This relaxation phenomenon was modeled by the Cole–Cole model.