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This paper focuses on the effect of melt radical graft modification of hindered phenolic antioxidant (AO3052) on the space charge and breakdown properties of polypropylene (PP) insulation. The DC conductivity, space charge distribution, and DC breakdown characteristics of grafted polypropylene with different antioxidant contents were tested and compared with the unmodified polypropylene. The results show that the antioxidants grafting can increase the sensitivity of conductivity to temperature and improve the conductivity activation energy of the samples. The 0.5% antioxidant grafting is effective in improving the space charge accumulation problem and reducing the degree of electric field distortion of PP. The DC electric strength of PP at 90℃ increases by 31.3%, and the ageing electric strength of PP at 90℃ increases by 36.1%, which is attributed to the ability of 0.5% antioxidant grafting in inhibiting the space charge accumulation. The energy band structure analysis suggests that the antioxidant grafting modification can introduce more local energy levels and potential traps in the forbidden bands of PP, which inhibits the charge transport. Meanwhile, the phenolic hydroxyl groups in the hindered phenolic antioxidants can scavenge the free radicals in PP, and the combined effect of the two enhances the breakdown performance of PP.
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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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