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In this paper, the low-temperature plasma was generated by DBD test platform, and the polyimide (PI) nanocomposite film was modified by the low-temperature plasma. The surface morphology, chemical bond structure, surface conductivity, and corona resistance of the nanocomposite film before and after the low-temperature plasma modification were tested to study the change law of the film surface characteristics. The results show that after surface modification, the nanocomposite film surface becomes rough gradually, and there are micropores and discontinuous protrusions appeared. Polar oxygen-rich groups were introduced on the surface by plasma modification with appropriate modification time. With the increase of modification time, the contact angle decreases, the surface energy and surface conductivity increase, and the corona resistance life increases at first and then decreases. When the low-temperature plasma modification time is 10 s, the corona resistance life of the modified nanocomposites film is 15.7% higher than that of the unmodified nanocomposites film. After modified by the low-temperature plasma, the nanocomposite film has more uniform surface than the pure PI film, and the modified nanocomposite film has the characteristics of small surface energy and large surface conductivity. The large surface conductivity will accelerate the dissipation speed of surface charge of the nanocomposite film, avoid the surface discharge produced by the concentration of local field strength, thereby improving the corona resistance life of the film. To obtain the same modification effect, the nanocomposite film need longer low-temperature plasma modification time than pure PI 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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