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To investigate the effect of vulcanization temperatures on the interface properties of XLPE return insulation for submarine cable flexible joints, XLPE single layer samples and XLPE-XLPE composite insulation interface simulated samples of submarine cable flexible joints were prepared at different vulcanization temperatures(160, 180, 200℃), the conductivity, space charge, gel content, and mechanical properties of the XLPE single layer samples were tested, and the space charge and mechanical properties of the XLPE-XLPE composite interface samples were tested. The results show that with the vulcanization temperature increases, the crosslinking degree of the XLPE single layer samples first increases and then decreases, the mechanical properties continuously improve, and the internal accumulated space charge first decreases and then increases. When the secondary vulcanization temperature of XLPE-XLPE composite interface sample is 180℃, the interface crosslinking property is the best. Under normal temperature and temperaure gradient conditions, the sample exhibits the lowest accumulated space charge amount at the interface and the best mechanical properties. When the secondary vulcanization temperature exceeds 180℃, XLPE undergoes thermal-oxidative ageing at higher vulcanization temperatures, leading to a decline in the mechanical and insulating properties of the interface.
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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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