氩等离子体射流对聚四氟乙烯表面改性的研究  

Experimental Research on Surface Modification of Polytetrafluoroethylene by Ar Atmospheric Pressure Plasma Jet

作　　者：郝致远[1] 汲胜昌[1] 宋莹[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《西安交通大学学报》2014年第4期59-67,共9页Journal of Xi'an Jiaotong University

基　　金：电力设备电气绝缘国家重点实验室资助项目(EIPE12308)

摘　　要：采用氩等离子体射流对有机材料聚四氟乙烯(PTFE)进行表面改性,通过接触角测量、扫描电子显微镜(SEM)观察、X射线光电子能谱(XPS)和衰减全反射红外光谱(ATR-FTIR)分析,以及表面电阻率和沿面闪络电压等参量的测量,研究了等离子体射流处理前后PTFE的表面特性。实验结果表明:氩等离子体射流产生的粒子主要有OH、N*、Ar和少量的O。PTFE经大气压氩等离子体射流处理后,其表面水接触角下降,表面粗糙度变大,表面突起和裂痕显著增加,且表面有新的含氧基团生成;增加表面改性时间,表面改性效果会达到饱和状态;另一方面,表面改性后的PTFE存在微弱的老化效应,当在空气中放置10d后,其表面水接触角为66.2°,仍然低于表面处理前的值。由于等离子体改性使PTFE表面形态及化学成分发生变化,粗糙度增加,使PTFE表面电阻率降低,导致其沿面闪络电压升高。Atmospheric pressure plasma jet is employed for surface modification of polytetrafluoroethylene （PTFE）. The microstructures and properties of the PTFE are investigated, including water contact angle measurements, surface morphology observation by scanning electron microscopy （SEM）, surface chemical composition analysis by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy （XPS） and surface resistivity and flashover voltage measurements. It is found that the argon plasma surface modification enhances surface hydrophilic, increases the surface roughness and introduces oxygen-containing polar functional groups on the surface. With the increasing discharge period, the water contact angle decreases to the saturation value. After setting the modified surface in air for ten days, its water contact angle of 66.2° is still much lower than that of the control sample. The surface resistivity of the modified PTFE reduces and the plasma modification heightens the surface flashover voltage due to increasing surface roughness.

关 键 词：等离子体射流 表面改性 聚四氟乙烯 水接触角 闪络电压 

分 类 号：TM89[电气工程—高电压与绝缘技术]