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To deeply understand the self-recovery mechanism of electrical tree in silicone rubber (SiR), the self-recovery characteristics of SiR electrical tree were studied in this paper. The morphology variation during the self-recover process of electrical tree in SiR were observed, the elastic modulus and crosslinking density of SiR during the self-recovery process of electrical tree were tested, and the self-recover mechanism of SiR electrical tree was analyzed. The results show that the electrical trees in SiR exhibit self-recovery characteristics without external interventions including external electrical field and healing fillers, wherein some branches of electrical tree gradually degrade and eventually disappear, meanwhile the fractal dimension gradually decreases, and the rate of self-recovery exhibits the stage characteristics of fast at first and then slow. During the self-recovery process, the elastic modulus of SiR sample increases slightly from 0.964 MPa to 0.977 MPa, and the crosslinking density decreases slightly from 1.886×10-4 mol/g to 1.883×10-4 mol/g. After recovery, the physical crosslinking density of electrical tree deteriorated area increases slightly from 0.55×10-4 mol/g to 0.58×10-4 mol/g. Combined with the growing mechanism of SiR electrical trees, it is analyzed that the self-recovery process of SiR electrical tree is essentially the elastic contraction of tree channel, which is controlled by the gas flow in the channel and accompanied by the reconstruction of hydrogen bond.
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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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