Improved dielectric properties of PVDF nanocomposites with core–shell structured BaTiO3 @polyurethane nanoparticles

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2020-09-01 DOI:10.1049/iet-nde.2020.0015
Ming-Sheng Zheng, Chong Zhang, Yu Yang, Zhao-Liang Xing, Xin Chen, Shao-Long Zhong, Zhi-Min Dang
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引用次数: 28

Abstract

Polymer nanocomposites with improved dielectric permittivity and high breakdown strength are extremely desirable for the flexible electronic devices and power systems. The compatibility of fillers and polymer matrix is important in determining the dielectric and breakdown strength properties. The core–shell structure concept is useful to improve the compatibility of fillers with polymer matrix. Herein, an organic thermoplastic urethanes (TPU) polymer shell was successfully grafted on the surface of barium titanate (BaTiO3, BT) and such a TPU shell improved the permittivity and breakdown strength of TPU@BT/PVDF polymer nanocomposites greatly. The permittivity of TPU@BT/PVDF nanocomposites with 12 wt% fillers at 102 Hz was up to 13.5, which was 1.5 times higher than that of pure poly(vinylidene fluoride) (PVDF). The improvement of the dielectric properties could be attributed to the enhanced interfacial polarisation between BT nanoparticles and TPU shell. Besides, the compatibility of BT nanoparticles and PVDF matrix was improved after the introduction of TPU shell. Accordingly, a highest breakdown strength value about 373 MV/m was obtained for the TPU@BT/PVDF nanocomposites with 7 wt% fillers. The core–shell strategy could be extended to a variety of inorganic fillers to improve the dielectric and breakdown strength properties of polymer nanocomposites.

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核壳结构batio3 @聚氨酯纳米颗粒改善PVDF纳米复合材料介电性能
聚合物纳米复合材料具有较好的介电常数和较高的击穿强度,是柔性电子器件和电力系统的理想材料。填料与聚合物基体的相容性是决定介质和击穿强度的重要因素。核壳结构的概念有助于提高填料与聚合物基体的相容性。本文成功地在钛酸钡(BaTiO3, BT)表面接枝了有机热塑性聚氨酯(TPU)聚合物外壳,该TPU外壳大大提高了TPU@BT/PVDF聚合物纳米复合材料的介电常数和击穿强度。填充量为12 wt%的TPU@BT/PVDF纳米复合材料在102 Hz下的介电常数高达13.5,是纯聚偏氟乙烯(PVDF)的1.5倍。这种介电性能的改善可归因于BT纳米颗粒与TPU壳之间的界面极化增强。此外,引入TPU壳层后,BT纳米颗粒与PVDF基体的相容性得到了改善。因此,当掺量为7 wt%时,TPU@BT/PVDF纳米复合材料的击穿强度最高可达373 MV/m。核壳策略可以推广到各种无机填料中,以提高聚合物纳米复合材料的介电和击穿强度。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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