核壳结构粒子/聚合物复合电介质材料研究进展

Research Progress on Core-Shell Structure Particles/Polymeric Based Composite Dielectric Materials

综述了基于核壳结构粒子的壳层结构调控导体或陶瓷核壳结构粒子/聚合物复合材料介电性能的最新研究进展,分析并总结了壳层设计、种类、结构、厚度等对复合材料介电性能的影响与调控机理,核壳结构粒子能协同改善复合材料的相对介电常数、击穿强度及降低损耗。界面缓冲区的绝缘外壳改善了复合体系界面相容性与填料分散性,有效抑制了载流子迁移,从而显著降低了体系的介电损耗及漏电流;此外,绝缘外壳还减缓了复合材料内部的电场畸变与集中,提高了材料的击穿强度。指出填料粒子核壳结构的合理设计及其与聚合物基体的协同效应,是提高复合电介质材料击穿强度的发展方向。

The latest research progress based on the shell structure of core-shell particles to regulate the dielectric properties of conductors or ceramic core-shell particles/polymer composites was reviewed. The effects and regulation mechanism of the shell design, type, structure and thickness on the dielectric properties of the composites were analyzed and summarized. The core-shell structure particles can concurrently improve the relative dielectric permittivity, breakdown strength of the composites and reduce leakage current. The insulating shell as an interlayer between the core and matrix improves the interface compatibility and the dispersion of fillers, and effectively inhibits the carrier migration, thus significantly reduces the dielectric loss and current leakage of the composites. Additionally,it further mitigates the distortion and concentration of electric field, and leads to an enhanced breakdown strength. It is pointed out that the reasonable design of the core-shell structure of filler particles and the synergistic effect with the polymer matrix are the development direction of improving the breakdown strength of composite dielectric materials.