Synthesis of Polybenzoxazine and Nano-Barium Titanate for a Novel Composite

Polymer-ceramic composites are suitable materials for low temperature fabrication of embedded capacitor technology. Dielectric properties of composites can be improved by adding amount of high dielectric constant ceramic powders (i.e. barium titanate). In this study, the composites with 0-3 connectivity were fabricated from barium titanate (BaTiO₃) ceramic powders and polybenzoxazine as a polymer matrix. It was found that the dielectric constants of composites at frequency range of 1 kHz -10 MHz increase with increasing the amount of BaTiO₃, and shows low frequency dependence. By adding 70wt% of BaTiO₃, the dielectric constant at 10 MHz significantly increased from 3.56 of pure polybenzoxazine to 13.2 at room temperature. Dielectric losses of these composites are less than 0.016. Subsequently, Yamada's model with a shape parameter about 5.2 was proposed to describe the dielectric behavior of BaTiO₃/polybenzoxazine composites.