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 expoxy resin and to interfacial polarization. This relaxation phenomenon was modeled by the Cole-Cole model.