Development and application of polymer-based nanocomposites dielectrics

Abstract

Polymeric composites are one of the most important materials in electronic packaging technology and much attention has been paid to its dielectric and energy storage behaviors in recent years. With the purpose of achieving nanocomposites with high dielectric constant, low loss and high breakdown strength, our group has focused on the microstructure construction of nanoparticles and grafting modification of polymer matrix. Various hybrids of metal nanoparticles randomly deposited on the surface of ceramic particles were prepared, including BaTiO 3 -supported Ag (BT-Ag), BaTiO 3 -suported Cu with a capping layer (BT-Cu), and BaTiO 3 nano fiber-supported Ag (BTnf-Ag). The hybrid particles serving as filler in composites have effectively improved the dielectric constant and suppressed the increase of dielectric loss. For example, A high dielectric constant of 160 at 1 kHz (16 times larger than that of PVDF) was obtained for BT-Ag/PVDF composites, with low conductivity (σ <10−5 S m−1) and low dielectric loss (tanδ=0.11).