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In this study, EPDM seal ring commonly used in gas insulated switchgear (GIS) equipment was treated at -55℃, and the effects of low temperature on its surface morphology, structure, glass transition temperature, and mechanical properties (tensile and compression permanent deformation) were investigated. The results show that the low temperature treatment cannot damage the macromolecular chain structure in the seal ring, but it is easy to cause frosting, and the glass transition temperature shows an increasing trend. The mechanical properties of the seal ring change greatly after low temperature treatment, the hardness and breaking strength decrease, while the elongation at break and compression permanent deformation increase. The degree of change in tensile property is related to the amplitude of alternating temperature difference in alpine environment, the greater the amplitude, the greater the breaking strength loss of the seal ring.
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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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