Dielectric relaxation studies on PVC-Pb3O4 polymer nanocomposites

This work studies the FTIR as well as dielectric characteristics of the PVC-Pb3O4 nanocomposite films. FTIR analysis shows the small shift in 650 cm(-1), 845 cm(-1) and 1732 cm(-1) band positions as a confirmation of interaction between Pb3O4 nanoparticles with PVC polymer matrix. The real permittivity (epsilon(1)) decreases with increasing frequency for all samples with the appearance of a relaxation peak at high temperatures. The dielectric loss data (epsilon(2)) of the PVC-Pb3O4 nanocomposites revealed a shift of the dielectric absorption peak towards high frequency with increasing temperature. The activation energy values for both alpha and beta relaxations almost decreased with increasing the Pb3O4 concentration. The energy density of samples containing Pb3O4 has a lower energy density than the pure PVC polymer film. The exponent (s) often increased with increasing the temperature, and this behavior is consistent with the overlapping large-polaron tunneling model. The DC activation energy decreased when the percentage of Pb3O4 increased to 3.0 wt% and then increased at 4.0 wt%.

Automated summary

The study investigates the FTIR and dielectric characteristics of PVC-Pb3O4 nanocomposite films, revealing changes in properties with temperature and Pb3O4 concentration. Activation energy values generally decrease, while energy density is lower compared to pure PVC films.