以可降解聚乳酸为膜材料,采用水溶性稀释剂二甲基亚砜(DMSO),实现了复合相分离法制备结构可调控的聚乳酸分离膜.重点考察了铸膜液温度和凝固浴温度对其结构及渗透性能的影响.结果表明,当凝固浴温度接近浊点温度时,相分离过程中主要以NIPs过程为主,形成了指状孔和大空腔结构,聚乳酸分离膜的纯水通量较小;牛血清蛋白的截留率较高.当凝固浴温度低于浊点温度时,体系发生TIPs和NIPs复合相分离过程,制备的聚乳酸分离膜具有双连续和指状孔结构,聚乳酸分离膜纯水通量较大,牛血清蛋白的截留率略有降低,但都在66％以上.当铸膜液温度接近浊点温度时,体系发生TIPs和NIPs复合相分离过程,制备的聚乳酸膜具有多孔的表面膜结构,表面膜孔与支撑层之间的连通性较高;随着铸膜液温度的增加,膜表面孔径减小,聚乳酸分离膜纯水通量降低,由610 L/(m2·h)降低至27.6 L/(m2·h);牛血清蛋白截留率增加,由61％提高至84％.
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