用大气压下空气辉光放电对聚四氟乙烯进行表面改性

Study on Surface Modification of Polytetrafluoroethylene Using Atmospheric Pressure Glow Discharge in Air

通过放电的电气特性测量和发光特性观察,界定了空气中大气压下辉光放电(APGD)和介质阻挡放电(DBD)的不同放电特点.用扫描电子显微镜(SEM)观察、接触角测量和X射线光电子能谱分析(XPS)等手段,研究了空气中APGD和DBD对聚四氟乙烯(PTFE)表面进行改性的效果,并分析了APGD和DBD处理效果不同的原因.实验结果表明:PTFE表面经APGD和DBD处理后,其表面微观样貌和表面化学成分均发生变化,且APGD的处理效果优于DBD.APGD可以对PTFE表面进行更为均匀的处理,经APGD处理40s后,PTFE表面的w(O)从0增加到21%,表面的水接触角从118°下降到53°.

The differences in discharge characteristics between atmospheric pressure glow discharge (APGD) and dielectric barrier discharge (DBD) are determined by the measurement of their electrical discharge parameters and observations of light emission phenomena. The effects of APGD and DBD on polytetrafluoroethylene (PTFE) surface modification are studied. The surface properties are characterized by the contact angle measurement, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Results show that the APGD and DBD treatments modify the PTFE surface in both morphology and composition, and the APGD is more effective than the DBD in PTFE surface modification. APGD can modify the surface more uniformly. After 40 s APGD treatment, the oxygen content of PTF surface increases from 0 to 21%, and the water contact angle decreases from 118° to 53°.