Study On Preparation And Dielectric Property Of BaTiO₃/Epoxy Resin (EPR) Composites With High Dielectric Constant

Embedded-capacitor technology is an important emerging technology that will enable significant improving of the performance and functionality of future electronic devices. Embedded-capacitors are specially printed of printed-circuit-board (PCB) laminates which perform the charge-storing function but don't require any space on the surface of the PCB.One major technical challenge for implementing this technology is the development of appropriate dielectric materials with good dielectric and mechanical properties,Ceramic/polymer composites ,which combines processibility of polymer and high dielectric constant of ceramic ,can be dielectric in capacitors with all kinds if shape . Therefore, the ceramic/polymer composite with high dielectric constant is a promising material in electrical engineering and electronic industry fields. Simultaneously, it is also very significant and practical for studying the ceramic/polymer composites with high dielectric constant.In this study, preparation and properties of BaTiO₃/Epoxy Resin (EPR) composites were studied. The results showed that diameter of BaTiO₃ played a significant role on dielectric property of the composites. The concentration of BaTiO₃ particles also has an effect on the microstructure and dielectric property of composites. 1wt% KH550 silane coupling agent was used in order to improve the interaction between BaTiO₃ and EPR, and subsequently induces a high dielectric permittivity and a low loss tangent. Additionally, the dielectric properties of the composites with different size of BaTiO₃ particles give different temperature dependence because of the existence of phase transition of large size BaTiO₃ particles at its Curie temperature.In general speaking, the results in the work have a great help for the application of the novel high-dielectric-constant BaTiO₃/EPR composites.