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用低温氧等离子体处理聚乙烯膜，被处理的膜通过红外、表面接触角、电子扫描显微镜、元素分析等手段证明在其表面形成了多量的羟基、羰基和羧基等含氧基团。当将这种处理膜的处理面对着原料液（ＵＰＥ）、处理面对着低压侧（ＤＰＥ）及原始膜（ＰＥ）分别用来渗透汽化分离乙醇水混合物，发现ＰＥ膜为优先透醇膜。ＵＰＥ渗透汽化产物的醇浓度下降，透量增加，并且透过速率对原料液浓度曲线呈反Ｓ形。ＤＰＥ膜则完全变成了优先透水膜，并且透过速率明显下降，说明渗透汽化膜表面的结构及组成对渗透汽化过程予以重大的影响，膜的上表面主要发生溶解，下表面则对被分离物予以强有力的扩散控制。
Polyethylene films were treated with low temperature oxygen plasma. The treated films showed that a large amount of oxygen - containing groups such as hydroxyl, carbonyl and carboxyl groups were formed on the surface by infrared, surface contact angle, scanning electron microscopy and elemental analysis. When treated with this treatment membrane facing the raw liquid (UPE), the treated side facing the low pressure side (DPE) and the original membrane (PE) were used for pervaporation to separate the ethanol-water mixture, the PE membrane was found to be a preferential permeate membrane. The UPE pervaporation product had a decreased alcohol concentration and an increased permeation rate, and the permeation rate showed an inverse S-shape with respect to the concentration curve of the raw material liquid. DPE membrane completely turned into a preferential water permeable membrane and the permeation rate decreased significantly, indicating that the structure and composition of the pervaporation membrane surface have a significant influence on the pervaporation process, the upper surface of the membrane mainly dissolves, while the lower surface is separated Subject to a strong proliferation control.