Evaluation of dielectric behavior of bio-waste reinforced polymer composite

Coir dust reinforced polymer composites are prepared with epoxy resin as the matrix. The dielectric parameters (relative permittivity epsilon', dielectric loss epsilon ''), AC conductivity sigma, and resistivity rho of pure epoxy resin and composites with different weight percent of coir dust were obtained in a frequency range of 100 Hz to 1 MHz, and temperature range of 30-150 degrees C. The experimental results show that epsilon', epsilon '', and sigma are increased and rho is decreased with the addition of coir dust in epoxy resin. It is also observed that the dielectrical properties of the composites showed a strong dependence on frequency and temperature. The epsilon' and epsilon '' increases with increasing temperature because of greater movement of the dipole molecular chains and decreases with increasing frequency due to the orientation polarization. The conductivity of the composite is increased, and the resistivity of composite is decreased with increasing frequency.