Dielectric Properties of Composites of Polypropylene with Zno-TiO2 Core-Shell Nanoparticles

Q4 Materials Science Journal of Surface Science and Technology Pub Date : 2018-12-03 DOI:10.18311/JSST/2018/20118
R. Sampathkumar, A. Aswathy, V. Balachandar
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引用次数: 1

Abstract

Composites of polypropylene with different weight percentages of ZnO-TiO 2 core-shell nanoparticles were prepared by the combination of solution and mixture melting methods. Dielectric properties of polypropylene composite films were studied at frequencies ranging from 50 Hz to 5 MHz at four different temperatures (313, 333, 353, and 373 K). It is observed that the dielectric constant reduces quickly in the low-frequency range followed by a near frequency independent behavior above 1 KHz. The dielectric properties of composites at low frequency can be explained by interfacial polarization or Maxwell-Wagner-Sillars effect. It is also observed that the dielectric constant reaches the maximum value at 3 wt% of ZnO-TiO 2 , which is the percolation threshold of nanocomposite. As the weight percentage of ZnO-TiO 2 increases beyond the percolation threshold up to 7%, the dielectric constant of the nanocomposites decreases. The dielectric loss of the composites follows the similar trend with frequency as the dielectric constant. A sharp increase in the dielectric loss of the nanocomposite observed near the percolation threshold is due to leakage current produced by the formation of conductive network by ZnO-TiO 2 core-shell nanoparticles. Further, peaks in the loss tangent observed for the nanocomposite systems indicating the appearance of a relaxation process. These relaxations peaks were shifted to higher frequencies as the particle content increased, since relaxation processes were influenced by the interfacial polarization effect which generated electric charge accumulation around the ZnO-TiO 2 core-shell nanoparticles.
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聚丙烯- Zno-TiO2核壳纳米颗粒复合材料的介电性能
采用溶液熔融和混合熔融相结合的方法制备了不同重量百分比的zno - tio2核壳纳米颗粒与聚丙烯复合材料。研究了聚丙烯复合薄膜在313、333、353和373 K 4种不同温度下,在50 Hz ~ 5 MHz频率范围内的介电特性。结果表明,在低频范围内,介电常数迅速减小,在1 KHz以上,介电常数基本与频率无关。复合材料在低频时的介电性能可以用界面极化或麦克斯韦-瓦格纳-西拉效应来解释。在zno - tio2含量为3 wt%时,介电常数达到最大值,这是纳米复合材料的渗透阈值。随着zno - tio2的重量百分比超过渗透阈值达到7%,纳米复合材料的介电常数降低。复合材料的介电损耗随频率的变化趋势与介电常数的变化趋势相似。在渗透阈值附近观察到的纳米复合材料的介电损耗急剧增加是由于zno - tio2核壳纳米颗粒形成导电网络产生的泄漏电流。此外,在纳米复合体系中观察到的损耗正切峰表明了弛豫过程的出现。由于弛豫过程受到界面极化效应的影响,从而在zno - tio2核壳纳米颗粒周围产生电荷积累,因此随着颗粒含量的增加,弛豫峰向更高的频率移动。
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期刊介绍: The Indian Society for Surface Science and Technology is an organization for the cultivation, interaction and dissemination of knowledge in the field of surface science and technology. It also strives to promote Industry-Academia interaction
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