Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG

Abstract

Ceramic/polymer dielectric composites are widely used as components for electric devices, mainly because of their high chemical stability, mechanical strength, and flexibility. In order to increase dielectric permittivity, ceramic fillers with high dielectric constant have been usually incorporated in the polymer matrix in large amounts. With the aim to enhance dielectric properties of matrix, 5 wt.% of BaTiO3/Fe2O3 core/shell composite was added into the PVDF matrix. Prior to addition, five BaTiO3/Fe2O3 powders were prepared by different synthesis conditions. The changes in crystal structure and lattice dynamics of the obtained ceramic/polymer composite were correlated with changes in the phase composition and morphology of BaTiO3/Fe2O3 core/shell filler. Thermal analysis such as DTA/TG/DSC are useful methods to determine various parameters in ceramic/polymer composites. We were able to corroborate that differences in phase composition and morphology of BaTiO3/Fe2O3 core/shell filler have influence on formation of various PVDF allomorph modification, as well as a level of crystallinity.