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Manifestation of Interactions of Nano-Silica in Silicone Rubber Investigated by Low-Frequency Dielectric Spectroscopy and Mechanical Tests

1
Department of Electrical Engineering, State Key Lab of Power System, Tsinghua University, Beijing 100084, China
2
Electrical Insulation Research Center, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
3
State Grid Jibei Electric Power Co. Ltd. Research Institute, Beijing 100045, China
4
High Voltage Engineering, Chalmers University of Technology, SE–412 96 Göteborg, Sweden
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(4), 717; https://doi.org/10.3390/polym11040717
Received: 25 March 2019 / Revised: 10 April 2019 / Accepted: 15 April 2019 / Published: 19 April 2019
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Abstract

Silicone rubber composites filled with nano-silica are currently widely used as high voltage insulating materials in power transmission and substation systems. We present a systematic study on the dielectric and mechanical performance of silicone rubber filled with surface modified and unmodified fumed nano-silica. The results indicate that the different interfaces between the silicone rubber and the two types of nano-silica introduce changes in their dielectric response when electrically stressed by a sinusoidal excitation in the frequency range of 10−4–1 Hz. The responses of pure silicone rubber and the composite filled with modified silica can be characterized by a paralleled combination of Maxwell-Wagner-Sillars interface polarization and DC conduction. In contrast, the silicone rubber composite with the unmodified nano-silica exhibits a quasi-DC (Q-DC) transport process. The mechanical properties of the composites (represented by their stress-strain characteristics) reveal an improvement in the mechanical strength with increasing filler content. Moreover, the strain level of the composite with a modified filler is improved. View Full-Text
Keywords: silicone rubber; silica nanocomposites; interface; dielectric response; mechanical properties silicone rubber; silica nanocomposites; interface; dielectric response; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, C.; Gao, Y.; Liang, X.; Gubanski, S.M.; Wang, Q.; Bao, W.; Li, S. Manifestation of Interactions of Nano-Silica in Silicone Rubber Investigated by Low-Frequency Dielectric Spectroscopy and Mechanical Tests. Polymers 2019, 11, 717.

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