文献类型：期刊文献

英文题名：Improving the dielectric properties of poly(vinylidene fluoride) composites by using poly(vinyl pyrrolidone)-encapsulated polyaniline nanorods

作者：Yu, Shuangmin[1];Qin, Fan[1];Wang, Gengchao[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2016

卷号：4

期号：7

起止页码：1504

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20160801966476);WOS:【SCI-EXPANDED(收录号:WOS:000370725200020)】；

基金：We greatly appreciate the financial supports of National Natural Science Foundation of China (51173042).

语种：英文

外文关键词：Dielectric losses - Dielectric materials - Fluorine compounds - Dielectric properties of solids - Dielectric devices - Polyaniline - Nanorods

摘要：The introduction of conductive polymers can significantly improve the dielectric constant of polymer-based materials but results in overly large increases of dielectric loss. Herein, uniform-sized and easily dispersed polyaniline nanorods (dPANI@PVP) were synthesized by applying a dynamically interfacial polymerization method and encapsulating the nanorods with poly(vinyl pyrrolidone) (PVP). The synthesized dPANI@PVP was then used to fabricate poly(vinylidene fluoride)-based (PVDF) nanocomposites that displayed a high dielectric constant and low dielectric loss. Morphological and structural analyses showed the insulating PVP shell to have a thickness of 5-10 nm and to be wrapped on the dPANI nanorod surface, which not only provided a barrier layer between the conductive dPANI nanorods, but also facilitated an excellent dispersion of dPANI nanorods in the PVDF matrix. As a result, the dPANI@PVP/PVDF nanocomposites showed a relatively low dielectric loss while maintaining a sufficiently high dielectric constant. Specifically, when the loading of dPANI@PVP was 9.5 wt%, the dielectric constant of the nanocomposite reached 174 at 100 Hz, which is about 20 times higher than that of pure PVDF. Moreover, there was only a small increase of the dielectric loss from 0.06 for pure PVDF to 0.17 for the nanocomposite.