Journal
MOLECULES
Volume 23, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/molecules23123153
Keywords
nonlinear filler; silicone rubber composites; dielectric properties; resistivity; temperature
Funding
- National Natural Science Foundation of China [51607101]
- Guangzhou Science and Technology Plan [201707020044]
- Cross Research Fund in Graduate School at Shenzhen, Tsinghua University [JC2017007]
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE18210]
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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 tan 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.
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