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In order to reveal the influence of external electric field on the internal molecular structure characteristics of silicone rubber insulation materials at the micro level, this paper used molecular simulation and quantum chemistry methods to explore the changes in the microstructure and space charge characteristics of silicone rubber under the action of external electric field. The results show that with the increase of electric field strength, the total energy of the silicone rubber molecule system decreases, the dipole moment and polarizability increase, and the C-Si bond inside the molecule becomes longer when subjected to the stretching effect of external electric field, resulting in a decrease of the stability of silicone rubber structure and affecting its mechanical and electrical properties. Under a higher electric field strength , the energy gap of the frontier orbitals decreases, and the reactive active sites of the silicone rubber molecular chain change, it causes of trap energy levels for the electron traps and hole traps in the frontier orbitals of the molecular chain to form different degrees of trap energy level distribution, and enhances the ability of silicone rubber to capture free electrons or injected charges in insulating materials. When the electric field reaches the critical value of 12.75×103 kV/mm, the molecular structure of silicone rubber is disrupted and causes changes in the infrared spectrum.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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