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EVA resin insulating blankets are widely used in distribution network non-stop operations, and they often suffer from thermal melting and mechanical damage under high temperature and high load conditions, which will lead to insulation failure. In order to analyze the effect of high temperature on the mechanical properties of EVA insulating blankets, EVA insulating blankets were conducted tensile test, X-ray diffraction analysis (XRD), and dynamic mechanical thermal analysis (DMA) analysis at different temperatures, and their mechanical properties and aggregated structure changes at high temperatures were characterized by parameters such as elongation at break, tensile strength, and storage modulus. The results show that with the increase of temperature, the crystal type in the structure of EVA insulating blanket remains unchanged, and the crystallinity tends to increase, the grain size in the main crystallization area decreases at first and then increases, and the corresponding grain spacing gradually increases, which results in the elongation at break of EVA insulating blanket showing the trend of increasing at first and then decreasing. However, the tensile strength of EVA insulating blanket tends to decrease. Under high temperature, the storage modulus of EVA insulating blanket shows a decreasing trend, which indicates that the EVA insulating blanket is less resilient and less rigid under high temperature, and 40℃ is an appropriate operating temperature for the EVA insulating blanket.
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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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