三明治结构PVA多层膜电容的设计与电学性能研究

Design and Electrical Performances of Sandwich Multilayer PVA Capacitor Film

实验将PVA/clay 1wt%(A)和PVA/graphene 1wt%(B)两种高分子前驱液利用线棒涂布器交替涂膜制备了具有三明治(ABAB….A)结构的电介质多层膜电容材料.利用X-射线衍射(XRD)、场发射扫描电子显微镜(FESEM)和差示扫描量热分析(DSC)对材料的分散状态及结构、形貌进行了表征,着重研究了三明治结构多层膜的介电性能和击穿强度.结果表明:与PVA/clay和PVA/graphene二元体系薄膜相比,三明治结构多层膜表现出综合的介电性能.在100Hz下,三明治结构多层膜的介电常数为12.3(是纯PVA薄膜的1.7倍),同时保持了较低的介电损耗为0.16.此外,三明治结构多层膜的击穿强度得到了有效提高,从而总体上提高了复合材料的储能密度.

Two polymer solution precursors,namely PVA/clay 1 wt%(A)and PVA/graphene 1 wt%(B),were alternately coated on a glass substrate with a rod coator.A sandwich multilayer structure(ABAB…A)of PVA composite capacitor film was prepared.The dispersion state,structure,and morphology of the material were characterized by XRD,FESEM and DSC instruments.Particularly attention was focus on the dielectric properties and breakdown strength of such composite film.The results showed that the multilayer capacitor film exhibited comprehensive dielectric properties as compared with that of the binary PVA/clay and PVA/graphene systems.The dielectric constant of the multilayer capacitor film increased to 12.3(1.7 times higher than that of neat PVA),while the dielectric loss remained nearly unchanged.In addition,the breakdown strength was clearly enhanced,thus leading to the improved energy density of composite film.