The hydrophobicity

hydrophobicity recovery at different temperature

mechanical and electrical performance of hightemperature vulcanization silicone rubber (HTV-SR) exposed to needleplate electrode corona discharge were investigated

and the damage phenomenon and molecular structure change of silicone rubber by corona discharge were also studied by using scanning electronic microscope (SEM) and fourier transform infrared spectrum conjunction with attenuated total reflection (ATR-FTIR).The test results show that there is clearly hydrophobicity decreasing and temporality losing at the surface of HTV-SR after corona discharge

and it is unable to recovery to the initial level.The higher is the temperature

the faster is its hydrophobicity recovery velocity.The static contact angle increases with the increasing of corona aging time

corona discharge leads to a sharp reduce of volume resistivity and dielectric strength

the dielectric loss angle is growing fast.The main damage phenomen on of silicone rubber caused by corona discharge is the black dust corona ring on the surface

whose diameter increases on the surface at first and then turn to depth direction combined with electrical erosion.The relative content of Si—O—Si

Si—CH3

C—H show downtrend with the increase of corona aging time.It is the representation that the tensile strength and hardness descend

the defect and hole on the surface increase.