Thermal, mechanical, and dielectric properties of low loss PbZr0.3Ti0.7 O3/polystyrene composites prepared by hot-press method

초록

The incorporation of high dielectric constant filler particles into thermoplastics is an attractive approach to develop materials with high dielectric strength, low dielectric loss, and mechanical stiffness, for electronic packaging purposes. Herein, we report the preparation and properties of polystyrene (PS) based low loss 0-3 composites with inorganic PbZr0.3Ti0.7O3 (PZT) filler particles in concentrations ranging from 0%-20% (w/w). The PZT particles were synthesized using the sol-gel process and the composites were prepared by a two-step, solvent-free approach: (1) melt mixing, followed by (2) hot press. The thermal and mechanical properties of the composite samples were investigated. The dielectric behavior of the as-synthesized composites showed pronounced improvement over pure PS, as is seen from the increased dielectric constant and extremely low loss tangent. For 20 wt.% PZT loading, the dielectric constant of the composite is as high as 12 at 1 MHz frequency, which is about five times greater than that of pure PS (epsilon = 2.5). All the PZT/PS composites exhibit remarkably low dielectric losses, even at lower frequencies (tan delta <= 0.04), which is better than reported literature values of PS based composites. The variation in dielectric constants of the samples with increasing temperatures was also recorded.

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