Preparation and Dielectric Properties of (Ba0.5Sr0.4Ca0.1)TiO3/Polystyrene Composites

Polymer composites with polystyrene (PS) as matrix and (Ba0.5Sr0.4Ca0.1)TiO3 (BSCT) as fillers are prepared by solution casting method. It is found that the dielectric constant of the prepared BSCT/PS composites increases with increasing filler content over the frequency range from 100 Hz to 500 MHz. And the dielectric properties of the composites show a good temperature independency over the range of -30 degrees C to 80 degrees C. For the composite with 50 vol % filler content, the dielectric constant and dielectric loss are comparable with the literature values reported for other PS composites used for microwave substrate. Several theoretical models are used to compare with the experimental data of the dielectric constant of the composites. The microstructure and thermal properties of the composites were also studied. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41398.