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

Abstract

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 ρ, α, α' and β-relaxation processes are observed in these studied ranges of temperature and frequency. An analysis of the dielectric constant, ε', and the dielectric loss index, ε", was performed assuming a distribution of relaxation times as confirmed by the behavior of electric modulus spectra. The calculated activation energy, E a , are 0.36eV, 0.17eV, and 0.09eV for α, α' and β-relaxation processes, respectively. The behavior of ac conductivity, σ ac , 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).