Dielectric properties and relaxation behavior of ZrO₂/polyvinylidene fluoride composites

The ZrO₂/polyvinylidene fluoride (PVDF) composites were prepared via melting method. The morphology and structure of ZrO₂/PVDF composites were analyzed by SEM, XRD and FTIR. The results show that the ZrO₂/PVDF composites with the uniformly distributed ZrO₂ are mainly composed of a large number of α phases and a small amount of γ phase. In addition, dielectric constant ε' of ZrO₂/PVDF composites increases with the increase of ZrO₂ content by dielectric spectroscopy (BDS) and the dielectric loss tanδ value keeps a constant, indicating that the dielectric properties of ZrO₂/PVDF composites can be significantly improved by adding ZrO₂. By calculating the dielectric modulus M″ and activation energy of ZrO₂/PVDF composites, the glass transition peaks, defect peaks and interfacial polarization peaks have been observed. The activation energy of ZrO₂/PVDF composite increases with the addition of ZrO₂.