The effect of Ag@SiO2 core‐shell nanoparticles on the dielectric properties of PVDF based nanocomposites

材料科学 电介质 复合材料 纳米复合材料 纳米颗粒 聚合物 介电损耗 纳米技术 光电子学
作者
Ling Weng,Xiaoming Wang,Xiaorui Zhang,Lizhu Guan,Lizhu Liu,Hexin Zhang,Weiwei Cui
出处
期刊:Polymer Composites [Wiley]
卷期号:41 (6): 2245-2253 被引量:30
标识
DOI:10.1002/pc.25535
摘要

Abstract High dielectric properties material has a profound influence on the development of electronic power system, polymer based composites obtained a great number of achievements on it. A new strategy, which covered a layer of insulation on the surface of the inorganic particles to form a core‐shell structure, then used it for composites is a good choice. In this article, a series of PVDF based nanocomposite with different contents were prepared by using PVDF flexible polymer as substrate and core‐shell structure Ag@SiO 2 nanoparticles as fillers. The effects of Ag@SiO 2 core‐shell nanoparticles on the structure and properties of composites were investigated. Results showed that Ag@SiO 2 has a typical core‐shell structure and the diameter size of Ag@SiO 2 nanoparticles is 100 nm in average with about 20 nm thickness of SiO 2 shell. XRD analysis showed that the addition of Ag@SiO 2 nanoparticles induce a transition on crystal structure of PVDF from multiphase to mainly β phase, which result in an improvement on ferroelectric properties of composites. Broadband dielectric spectroscopy results indicate that the dielectric constant and dielectric loss of nanocomposites are positively correlated with the filler's contents. The tested dielectric constant of composites increase from 8.42 (5 wt% fillers content) to 10.1 (20 wt% fillers' content), coupled with an increase on electrical breakdown strength from 21.22 to 31.46 kV/mm. The calculated energy density also increases from 0.016777 to 0.044234 J/cm 3 .
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