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

作者：Guan Fangxiao^*; Yuan Zhongzhe; Shu Essay W; Zhu Lei

来源：Applied Physics Letters, 2009, 94(5): 052907.

DOI：10.1063/1.3079332

• crystallisation
• dielectric polarisation
• ferroelectric thin films
• ferroelectricity
• polymer blends
• space charge

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.

• 出版日期2009-2-2