Manifestation of Interactions of Nano-Silica in Silicone Rubber Investigated by Low-Frequency Dielectric Spectroscopy and Mechanical Tests
Artikel i vetenskaplig tidskrift, 2019

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.

dielectric response

mechanical properties

silica nanocomposites


silicone rubber


Chao Wu

Tsinghua University

University of Connecticut

Yanfeng Gao

State Grid Jibei Electric Power Co., Ltd.

Xidong Liang

Tsinghua University

Stanislaw Gubanski

Tsinghua University

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

Qian Wang

Tsinghua University

Weining Bao

Tsinghua University

Shaohua Li

Tsinghua University


2073-4360 (eISSN)

Vol. 11 4 717


Textil-, gummi- och polymermaterial


Kompositmaterial och -teknik





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