中文摘要：

采用甲基丙烯酸甲酯对水性聚氨酯乳液进行共聚改性,制备了甲基丙烯酸甲酯改性水性聚氨酯渗透汽化膜。借助衰减全反射傅里叶变换红外光谱、扫描电镜、热重分析等方法,表征了改性前后膜的结构;考察了膜的溶胀率、溶解选择性和渗透汽化性能。结果表明,甲基丙烯酸甲酯共聚改性水性聚氨酯膜较原聚氨酯膜的热稳定性明显提高;改性膜对苯具有良好的亲和性;随着甲基丙烯酸甲酯与聚氨酯的质量比从0∶100提高到15∶100,膜对苯/环己烷（质量比5/95）的溶解选择因子从1.4增加到2.1,分离因子从2.5上升到3.2,但渗透通量由92.8 kg·μm·m-2·h-1下降到50.4 kg·μm·m-2·h-1。

英文摘要：

Waterborne polyurethane （WPU） was modified by eopolymerization of methyl methacrylate （MMA）. A series of pervaporation membranes were fabricated to separate benzene and cyclohexane. By ATR-FT-IR, SEM, TGA, the structure of the MMA modified membranes were characterized. The swelling degree, solubility selectivity and pervaporation property of the membranes were investigated. It is shown that the thermal stability of membranes is significantly improved. The obtained membranes show good affinity to benzene. The solubility selectivity factor increases from 1.4 to 2.1 and the separation factor increases from 2.5 to 3.2, as the mass ratio of MMA to WPU increases from 0：100 to 15 ： 100. Nevertheless, the permeation flux decreases from 92.8 kg·μm· m- 2· h- 1 to 50.4 kg·μm·m-2·h-1.