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A thermochromic microcapsule epoxy resin composite insulation material (TEP) was prepared, and its power frequency permittivity (εr), dielectric loss factor (tanδ), and DC conductivity (σ) were analyzed in this paper. The results show that the temperature characteristic of dielectric constant of composite insulation material has an infelction point at 70℃. When the temperature is lower than 70℃, εr increases rapidly with the increase of temperature. When the temperature is higher than 70℃, the change rate of εr with temperature decreases significantly. The tanδ decreases significantly when the temperature is 50-70℃. The addition of thermochromic microcapsules can effectively reduce the DC conductivity of composite insulation material. In the thermochromic temperature range of 50-70℃, the solid-liquid phase transition occurs inside thermochromic microcapsules, which is the main reason for the special temperature characteristics of εr and tanδ. In the solid-liquid phase transition process, the molecular activity of the core material in microcapsule increases gradually, and the resistance that it needs to overcome in the orientation polarization with the external electric field decreases, resulting in the rapidly increase of εr and the significant decrease of tanδ with the increase of temperature. When the core materials of microcapsule are fully transformed to liquid state, its molecular activity decreases with temperature, leading to the significant decrease of εr with temperature.
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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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