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为了研究多层脉冲介质阻挡放电(dielectric barrier discharge,DBD)对聚四氟乙烯薄膜表面亲水性改善的影响,采用3层介质层阻挡的结构,在大气压空气中使用亚微秒级重复频率单极性脉冲电源驱动产生放电低温等离子体。在一定的处理时间条件下,通过改变薄膜所处介质层方式、施加电压幅值、电源频率及气隙间距进行聚四氟乙烯薄膜表面处理实验,并测量处理前后薄膜的表面水接触角。结果显示当3层介质层上均贴有薄膜样品时水接触角变化最大,处理效果较好;随电压幅值及频率的增加薄膜表面水接触角减小并趋于饱和,气隙间距1 mm时薄膜表面水接触角从118°变化最小可到72°左右;而对处理后薄膜进行酒精清洗,发现频率过大或过小时、气隙间距过大或过小时薄膜表面处理效果不明显,在电压40 k V、频率500 Hz、气隙间距1 mm时的薄膜表面亲水性改善效果最佳,清洗后其表面水接触角最小可达85°左右,并可进行多层薄膜同时处理。与双层介质层放电等离子体表面效果相比,该放电结构具有很好的PTFE薄膜亲水性改善效果,能够增加薄膜处理面积,为实际应用提供了可靠的数据参考及可行路线。
In order to study the effect of multi-layer dielectric barrier discharge (DBD) on the surface hydrophilicity of polytetrafluoroethylene (PTFE) films, three layers of dielectric layers were used to block the structure, and sub-microsecond repetition rate Polarity pulse power driven discharge low temperature plasma. Under the condition of certain treatment time, the PTFE membrane surface treatment experiment was carried out by changing the mode of dielectric layer where the membrane was located, applying voltage amplitude, power frequency and air gap distance, and measuring the surface water contact angle of the membrane before and after treatment. The results show that the water contact angle changes most when the film is affixed on the three media layers, and the treatment effect is better. With the increase of voltage amplitude and frequency, the water contact angle decreases and tends to be saturated, the air gap spacing is 1 mm The contact angle of water on the surface of the film changes from the minimum of 118 ° to about 72 °, while the alcoholic cleaning of the treated film reveals that when the frequency is too large or too small, the surface treatment effect of the film is not obvious when the air gap is too large or too small. When the voltage is 40 kV, the frequency is 500 Hz and the air gap is 1 mm, the hydrophilic effect of the film surface is best. The contact angle of the surface water after cleaning is about 85 ° minimum and the multi-layer film can be processed at the same time. Compared with the discharge plasma surface effect of double dielectric layer, the discharge structure has good hydrophilic effect of PTFE membrane, can increase the film processing area, and provides reliable data reference and feasible route for practical application.