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To investigate the influence and mechanism of extrusion temperature on the mesoscale crystalline morphology and comprehensive performance of high-voltage cable insulation materials, we prepared three types of insulation materials by controlling the extrusion temperature. Systematic characterization, electrical and mechanical performance testing, and simulation were employed to reveal the structure-property relationship between crystalline morphology and material performance. The results show that at an extrusion temperature of 120℃, the insulation material exhibits densely packed and uniform crystal configuration, and shows optimal crystallinity and crystal size, which is 42.28% and 15.15 μm, respectively. The improvement of crystal morphology can slightly enhance the dielectric constant of insulation materials and maintain extremely low dielectric loss, while can significantly increase the adhesive yield, volume resistivity, electric strength, and elongation at break of insulation materials. According to the mutual verification of simulation and experimental results, it is concluded that complete crystal configuration, larger crystal size and crystallinity can minimize the distortion degree of electric field in the amorphous region, suppressing the occurrence of partial discharge and breakdown, resulting in the electric strength reaching the optimal value (390 kV/mm).
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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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