Studies on Nano Barium Strontium Titanate/Cellulose Derivatives Composites

Studies on Nano Barium Strontium Titanate/Cellulose Derivatives Composites چکیده [English] Studies were carried out on the preparation and properties of the composites made from cellulose acetate butyrate and cellulose acetate propionate with various amounts of barium strontium titanate nano-particle. The nano-particles of barium strontium titanate (BST) with formulation of Ba0. 77Sr0. 23TiO3 were made by sol-gel method and their purity and particle size were analyzed by X-ray diffraction (XRD). The composites were prepared with BST nano-particle loading of 10 to 50 vol%, and their distribution in the composites studied using SEM imaging. The dielectric constant of the composites was measured at 1 kHz and 100 kHz at room temperature. It was found that the adopted procedure produced dense and uniform composites. The dielectric constant of the composites increased with the solid content of BST and followed the modified Lichtenecker equation. The increasing rate of dielectric constant with increased BST content was more pronounced for the BST/CAP composite. The dielectric constant of the composites decreased with increasing the frequency which was more obvious at higher loading of BST nano-particle.