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In order to realize the synergistic enhancement of electrical-mechanical properties of epoxy resin for power electronics encapsulation, CaCO3 oligomer inorganic nanoparticle filler was prepared by solution method, epoxy resin was carried out organic matrix-inorganic filler modification together with organic silicone, and single inorganic modified, single organic modified, and organo-inorganic jointly modified epoxy resin composites were prepared. Taking the pure epoxy resin as a reference, the AC electric strength, DC volume conductivity, surface potential attenuation characteristics of the four epoxy resin composites were investigated, and the internal trap energy levels were calculated from them, while their bending strength and impact strength characteristics were also investigated. The results show that the electrical properties of single inorganic modified, single organic modified, and organic-inorganic co-modified epoxy resin composites are significantly improved, and their electric strength increases by 6.55%, 12.66% and 9.61%, respectively. Their DC volume resistivity is 5 times bigger than that of pure epoxy resin, the surface potential decay rate decreases, the trap density and trap energy increase, but the improvement of electrical properties by the organic-inorganic co-modification do not superimpose compared with single modification. The flexural and impact strengths of the modified epoxy resin composites significantly increase, with exponential growth compared to the pure epoxy resin. The research results provide a reference for the performance improvement of modified epoxy resin composites in the field of power electronics insulation and encapsulation.
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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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