Abstract: The styrene-maleic anhydride copolymer (SMA)/chlorinated polyvinyl chloride (CPVC) blend ultrafiltration membranes was prepared by non-solvent induced phase separation (NIPS). The effects of different solvent content in coagulation bath on the degree of anhydride group segregation, microstructure, hydrophilicity, water flux, rejection and anti pollution of the membrane surface were discussed. The results showed that the increase of DMAc content in the coagulation bath inhibited the degree of segregation of anhydride on the membrane surface, resulting in the decrease of hydrophilicity.At the same time, duing to the change of the diffusion rate between DMAc and water molecules in the casting solution causes delayed phase separation, which makes the pore size of the membrane surface smaller and the distribution narrower. When DMAc content was 3%, the BSA interception rate of ultrafiltration membrane increased to 98.10%, the flux recovery rate was 96.82%, and the irreversible contamination rate decreased to 3.77%, indicating that the appropriate solvent in the coagulation bath could further improve the anti-pollution performance of ultrafiltration membrane protein.

Key words: Non-solvent phase separation , Ultrafiltration membrane, Surface segregation, anti-pollution

摘要： 通过非溶剂致相分离（NIPS）法制备了苯乙烯—马来酸酐共聚物（SMA）/氯化聚氯乙烯（CPVC）共混超滤膜，探讨了凝固浴中不同溶剂含量对其超滤膜表面酸酐基团偏析程度、微观结构、亲水性、水通量、截留率和抗污染的影响。结果表明：凝固浴中溶剂含量的增加抑制了酸酐基团向膜表面的偏析，导致亲水性减弱；同时，铸膜液中溶剂与水分子之间扩散速率的变小引起延迟分相，使得膜表面孔径变小和分布变窄。当溶剂含量为3%时，超滤膜的BSA截留率提升至98.10%、通量恢复率为96.82%且不可逆污染率降为3.77%，表明凝固浴中适量的溶剂可进一步提高超滤膜抗污染性能。

关键词: 非溶剂致相分离, 超滤膜, 表面偏析, 抗污染