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An experimental platform was built to conducted thermal ageing experiments at 105℃, 155℃, and 180℃ respectively for 30 d on a domestic meta-aramid insulating paper, and the changes of chemical structure, micro-morphology, and electrical properties of the paper during thermal ageing process were studied. On the basis of isothermal surface potential decay method, the surface trap distribution characteristics of the samples at different thermal ageing stages were compared, and the polymerization degree and electric strength of the samples under different ageing temperature were fitted. The results show that the thermal ageing has a destructive effect on the surface and cross section of meta-aramid paper macroscopically, resulting in a decrease of the polymerization degree overall. Microscopically, the thermal ageing has a significant destructive effect on the amide bonds, C-N bonds, and C=O bonds in the molecular structure of meta-aramid paper. The thermal ageing causes the volume conductivity of meta-aramid paper to increase and the electrical strength to decrease. During the thermal ageing process, shallow traps will appear briefly and then disappear, and the higher the temperature, the earlier the shallow traps appear, which is of great significance for the quantitative judgment of thermal ageing stage for the meta-aramid paper.
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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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