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

interface

mechanical properties

silica nanocomposites

silicone rubber

dielectric response

Author

Chao Wu

University of Connecticut

Tsinghua University

Yanfeng Gao

State Grid Jibei Elect Power Co Ltd

Xidong Liang

Tsinghua University

Stanislaw Gubanski

Tsinghua University

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components

Qian Wang

Tsinghua University

Weining Bao

Tsinghua University

Shaohua Li

Tsinghua University

Polymers

2073-4360 (eISSN)

Vol. 11 4 717

Subject Categories

Textile, Rubber and Polymeric Materials

Materials Chemistry

Composite Science and Engineering

DOI

10.3390/polym11040717

PubMed

31010177

More information

Latest update

4/20/2020