Dielectric Modulus Relaxation and Hopping Conduction Mechanism of Bisphenol A Corncobs Polycarbonate

Dielectric relaxation of bisphenol A corncobs polycarbonate (BPACC)
has been studied in the temperature and frequency ranges of 310-400K and
100Hz-4MHz, respectively. A clear r, a, a' and b-relaxation processes are
observed in these studied ranges of temperature and frequency. An analysis of
the dielectric constant, e', and the dielectric loss index, e", was performed
assuming a distribution of relaxation times as confirmed by the behavior of
electric modulus spectra. The calculated activation energy, Ea, are 0.36eV,
0.17eV, and 0.09eV for a, a' and b-relaxation processes, respectively. The
behavior of ac conductivity, sac, of BPACC sample revealed that the relaxation
occurs as a result of charge carriers between localized states. The conduction
mechanism of BPACC sample is controlled by the correlated barrier hopping
model (CBH).