Poly (Vinylidene Fluoride)/Mg Doped CaCu3Ti4O12 Composites with Improved Dielectric Properties

The CaCu 3-x Mg x Ti 4 O 12 (CCMTO) particles were prepared by sol-gel method, ceramic/polymer composites made of CCTO and CCMTO particles as filler and polyvinylidene fluoride (PVDF) as matrix were prepared by powder mixing method. The microstructure and dielectric properties of the PVDF, CCTO, CCMTO particles and CCMTO/PVDF composites were investigated. The results indicate that the dielectric permittivity and the dielectric loss increased with increasing ceramics particles loading. The dielectric permittivity could reach 93 and dielectric loss was 0.2 when mass fraction of CCMTO is 60wt% at 100 Hz. SEM results show that CCTO and CCMTO particles dispersed well in the PVDF matrix. Doping Mg can improve dielectric permittivity of the CCTO/PVDF composites and slightly reduce the dielectric loss, compared raw CCTO/PVD composites.