关键词: 非溶剂致相分离, 超滤膜, 表面偏析, 抗污染

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