介质阻挡放电处理增强聚合物薄膜表面亲水性

为提高聚合物材料的表面性能,用介质阻挡放电对聚对苯二甲酸乙二酯、聚丙烯、聚四氟乙烯薄膜进行表面改性,并研究了DBD等离子体处理对这些材料亲水性的影响;测量了材料表面水接触角和表面能随处理时间的变化规律及处理后的材料在空气中放置时的老化效应,并对结果进行分析。研究结果表明,3种聚合物薄膜经DBD等离子体处理后,接触角随处理时间的增加而降低,表面能随处理时间的增加而增加,二者均在一定处理时间后达到饱和值;处理后的材料在空气中放置时会出现老化效应,但即使放置12天后,材料表面水接触角仍远低于处理前的值。

Improvement of Hydrophilicity of Polymer Film Surface Using Dielectric Barrier Discharge Treatment

To determine the effects of air dielectric barrier discharge(DBD) plasma treatment on the changes of material surface properties for achieving large-scale industrial application of DBD plasma,the surfaces of PET,PP and PTFE films are modified using non-thermal plasma generated by DBD in air,and the effects of DBD plasma treatment on the hydrophilicity of material surfaces are studied.The changes of the water contact angle and surface energy of treated surface with treatment time are studied,and the aging effect after treatment when the treated materials are exposed to open air is also studied.Results show that,the contact angle decreases with the increase of treatment time and the surface energy increases with the increase of treatment time,and both of them achieve the saturated value at certain treatment time,indicating that there exists an optimum parameter for the surface treatment.After long-term storage in ambient air,it is found that the much lower surface water contact angle of the processed polymer films partially recovers but the value of water contact angle is still much lower than that of the untreated materials even after 12 days storage.This reveals that the treated polymer surfaces have a good stability over aging time.