Dielectric Properties of Barium Titanate/ Polybenzoxazine Composites for Electrical Applications

Polymer-ceramic composites are candidate materials for electrical applications, especially embedded capacitors. In this study, barium titanate (BaTiO$_{3})$ powders prepared from sol-gel process were incorporated into polybenzoxazine matrix to form composites with 0-3 connectivity. The dielectric properties of these composites, including dielectric constant and loss tangent, were studied as a function of BaTiO$_{3}$ contents in the frequency range of 1 kHz-10 MHz at room temperature. The benzoxazine coating on BaTiO$_{3}$ powders have been used to prevent the agglomeration of ceramic fillers. The distribution of BaTiO$_{3}$ powders in the matrix was investigated by using scanning electron microscope (SEM). Moreover, the dielectric constant of these composites will be fitted with theoretical models for 0-3 connectivity (Yamada's model).