摘要
采用针-板电极交流电晕放电试验装置研究了电晕放电对高温硫化硅橡胶憎水性、不同温度下憎水恢复性、力学性能和电气性能的影响,结果表明电晕放电作用不同时间后高温硫化硅橡胶材料憎水性丧失是一个渐进的过程,严重时硅橡胶材料憎水性会暂时性丧失,硅橡胶材料在不同温度下憎水性恢复速度不同,电晕放电作用后硅橡胶材料憎水接触角不能恢复至新试样初始水平.电晕放电不同时间后硅橡胶材料表面受电晕放电影响的范围逐渐扩大,表面产生了黑色粉末状电晕环,前期发展较快,然后逐渐由表层损坏转为纵深方向发展,材料表面和内层均可能遭到不同程度电蚀损,硅橡胶主链基团Si—O—Si、侧链基团Si—CH3和甲基中C—H键相对强度均随着电晕放电作用时间的增加呈下降趋势,材料拉伸强度和硬度有所下降,介电性能明显下降.
The hydrophobicity, hydrophobicity recovery at different performance of hightemperature vulcanization silicone rubber （HTV-SR） discharge were investigated, and the damage temperature, mechanical and electrical 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 dielectric by corona then turn strength, the dielectric loss angle is growing fast. The main damage a sharp reduce of volume resistivity and phenomen on of silicone rubber caused discharge is the black dust corona ring on the surface , whose diameter increases on the surface at first and to depth direction combined with electrical erosion. The relative content of Si--0--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.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2009年第4期331-337,共7页
Acta Polymerica Sinica
基金
广东电网公司2007年重点科研项目(项目号2007725)资助
关键词
高温硫化硅橡胶
电晕放电
憎水性
力学性能
红外光谱分析
High temperature vulcanization silicone rubber, Corona discharge, Hydrophobicity, Mechanical property, ATR-FTIR
