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Polyimide (PI) film has become a key material for turn-to-turn insulation in electric drive motors due to its excellent high-temperature stability, superior mechanical properties, and outstanding electrical insulation performance. In this paper, the aggregation structure of PI were regulated by change the types of catalysts during the chemical imidization process. The effects of different catalysts on the aggregation structure of PI were discussed, and the effects of catalyst types on electro-thermal-mechanical properties and corona resistance of PI were studied systematically. The results show that the aromatic catalyst isoquinoline can promote the orderly arrangement of molecular chains through π-π interactions, and significantly enhancing the dielectric and corona resistance properties of PI. The PI film prepared using isoquinoline catalyst exhibits excellent dielectric performances. At a frequency of 1 kHz, its dielectric constant can reach 3.47, while the dielectric loss factor reduces to 0.001 1, and the electric strength at room-temperature reaches 561.39 kV/mm. Furthermore, its corona resistance performance is greatly improved. Under 20 kHz, the corona resistance lifetime reaches 5.8 min, which is 1.68 times that of the thermally imidized film.
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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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