Fast discharge speed in poly(vinylidene fluoride) graft copolymer dielectric films achieved by confined ferroelectricity

被引：72

作者：

Guan, Fangxiao ^{[1
]}

Yuan, Zhongzhe ^{[1
]}

Shu, Essay W. ^{[1
]}

Zhu, Lei ^{[1
]}

机构：

[1] Univ Connecticut, Dept Chem Mat & Biomol Engn, Polymer Program, Inst Sci Mat, Storrs, CT 06269 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 05期

关键词：

crystallisation; dielectric polarisation; ferroelectric thin films; ferroelectricity; polymer blends; space charge; ENERGY DENSITY;

D O I：

10.1063/1.3079332

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Although a high electric energy density was recently reported for defect-modified poly(vinylidene fluoride) (PVDF) copolymers at millisecond discharge, they usually deliver less energy at a high pulse rate. In this letter, a low loss polystyrene (PS) was grafted as side chains onto the P(VDF-chlorotrifluoroethylene) main chain. After PVDF crystallization, dielectric PS side chains were segregated to the crystalline-amorphous interface, forming a finite confinement layer for ferroelectric PVDF crystals. We speculated that less space charge was induced during electric poling because of the nanoscale confinement effect. Consequently, a fast discharge speed and a relatively high energy density were achieved.

引用

页数：3

共 10 条

[1] A dielectric polymer with high electric energy density and fast discharge speed [J].