物理学报2012，Vol.61Issue(13)：494-499,6.
表层氟化温度对聚乙烯中空间电荷积累的影响
Influence of surface fluorination temperature on space charge accumulation in polyethylene
摘要
Abstract
Polyethylene （PE） discs prepared by hot-pressing, each with a thickness of 0.8 mm, are surface fluorinated in a laboratory vessel by an F2/N2 mixture containing 12.5% F2 by volume at different temperatures of 35, 55, and 70 °C for the same time of 2 h. The influence of fluorination temperature on space charge accumulation in PE is investigated by the pressure wave propagation method. The results show an obvious decrease in space charge accumulation in the fluorinated sample subject to a direct current high voltage with the increase of fluorination temperature, and there exists almost no charge accumulation in the sample fluorinated at 70° C. Attenuated total reflection infrared analyses indicate a substantial change in chemical composition of the sample surface layers by the fluorinations and an obvious increase in degree of fluorination with fluorination temperature increasing. Contact angle measurements and surface energy calculations indirectly indicate a significant increase in permittivity of the fluorinated layers by the fluorinations. Open-circuit thermally stimulated discharge current measurements further reveal different charge trapping properties of the fluorinated layers and the improved barrier properties of the fluorinated layer to the diffusion of the chemical species from the semi-conductive electrode to the PE with increase of fluorination temperature, thus indicating a corresponding decrease in free volume of the surface layer. The decrease in the free volume plays a more important role in suppressing the space charge accumulation, compared with the increase in permittivity and the change in charge trap.关键词
聚乙烯/表层氟化温度/空间电荷/氟化层特性Key words
polyethylene/surface fluorination temperature/space charge/fluorinated layer properties分类
化学化工引用本文复制引用
陈暄,安振连,刘晨霞,张冶文,郑飞虎..表层氟化温度对聚乙烯中空间电荷积累的影响[J].物理学报,2012,61(13):494-499,6.基金项目
国家自然科学基金项目 （）
电力设备电气绝缘国家重点实验室（EIPE11210）资助的课题 （）
