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Molecules 2018, 23(12), 3153;

Nonlinear Electrical Properties and Field Dependency of BST and Nano-ZnO-Doped Silicone Rubber Composites

Department of Electrical Engineering Graduate school at Shenzhen, Tsinghua University, Shenzhen 518055, China
China National Electric Apparatus Research Institute Co., Ltd., Guangzhou 510080, China
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 31 October 2018 / Revised: 28 November 2018 / Accepted: 28 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue Advances in Silicon Chemistry 2018)
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Recently, composite materials with nonlinear dielectric or resistive properties performed well in electric field homogenization and space charge suppression in a high voltage transmission and distribution system. For the purpose of obtaining insulation materials with desirable dielectric and electrical resistance properties, we investigated several fillers with nonlinear electrical properties doped in silicon rubber composites, and their dependency on the temperature and field. The samples of silicone rubber composites with different components were prepared using barium strontium titanate (BST) and zinc oxide (ZnO) as the filler, and high temperature vulcanized silicone rubber (SiR) as the matrix. The investigations revealed that the BST-doped samples showed different dielectric properties compared to ZnO-doped composites, with an increase in the electric field, which was nonlinear. The resistivity of both doped samples was similar. Results demonstrated that it was possible to achieve higher values of permittivity, and lower values of tanδ and resistivity, with respect to unfilled silicone rubber composites over a wide electrical field and temperature range. Discussion of the results attributes these important functional behaviours to the spontaneous polarization of nonlinear nanoparticles and the interaction between the SiR chains and the nonlinear nanoparticles at the interfacial area. View Full-Text
Keywords: nonlinear filler; silicone rubber composites; dielectric properties; resistivity; temperature nonlinear filler; silicone rubber composites; dielectric properties; resistivity; temperature

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Guo, J.; Wang, X.; Jia, Z.; Wang, J.; Chen, C. Nonlinear Electrical Properties and Field Dependency of BST and Nano-ZnO-Doped Silicone Rubber Composites. Molecules 2018, 23, 3153.

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