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研究了氧等离子体对海藻酸钠膜的表面改性，并将该膜用于渗透汽化分离乙醇水溶液。通过红外光谱、表面电阻、接触角等手段测试，表明在海藻酸钠膜表面增加了羟基、羧基及羰基，因而更加亲水。当分别用未处理的原始膜，氧等离子体处理膜处理表面对着原料液，以及处理表面对着减压侧用于渗透汽化法分离乙醇－水混和物时，性能明显不同。其结果是：上表面处理后，渗透通量明显增加，分离系数也较未处理略高；下表面处理后，渗透速度下降，分离系数有较大提高。表明渗透汽化膜的上、下表面对其性能有较大影响。上表面对膜的溶解过程影响较大，下表面对膜的扩散控制有较大贡献。
The surface modification of sodium alginate membrane by oxygen plasma was studied and the membrane was used for the pervaporation separation of ethanol-water solution. By infrared spectroscopy, surface resistance, contact angle and other means of testing, indicating that the sodium alginate membrane surface hydroxyl, carboxyl and carbonyl, and thus more hydrophilic. The performances were significantly different when the untreated raw film, the oxygen plasma-treated film-treated surface were opposed to the raw material liquid, and the treated surface was used for the pervaporation to separate the ethanol-water mixture against the decompression side, respectively. The results are: after the surface treatment, the permeation flux increased significantly, the separation coefficient is also slightly higher than the untreated; Under the surface treatment, the penetration rate decreased, the separation coefficient has greatly increased. It shows that the upper and lower surfaces of the pervaporation membrane have a greater impact on its performance. The upper surface of the membrane dissolution process has a greater impact, the lower surface of the membrane diffusion control have a greater contribution.