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In order to explore the change law of Shore A hardness and surface roughness of silicone rubber and fluorosilicone rubber under continuous low temperature environment, we put the test pieces made of the two raw materials into the low temperature test box, and carried out low temperature ageing test at -50℃ for 0, 48, 96, 144 h, respectively. The change law of Shore A hardness, surface roughness, and surface morphology with low temperature ageing time were studied, and then its principle was analyzed. The results show that at the constant low temperature environment of -50℃, when the ageing time increase from 0 h to 144 h, the Shore A hardness of the two materials increases slowly at first, then increases sharply, and finally decreases slowly. The surface roughness of the two material decreases at first, then increases sharply, and finally increases slowly. Throughout the ageing process, both the Shore A hardness and surface roughness of fluorosilicone rubber are smaller than that of silicone rubber. It shows that under low temperature environment, fluorosilicone rubber is more stable than silicone rubber.
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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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