凝固浴组成对聚醚砜/磺化聚砜共混膜结构及性能影响

摘要

为考察不同凝固浴组成对聚醚砜/磺化聚砜共混膜结构及性能的影响规律,以聚醚砜(PES)、磺化聚砜(SPSf)为膜材料、N,N-二甲基乙酰胺(DMAc)为溶剂、聚乙二醇(PEG)为致孔剂、H2O为非溶剂添加剂,采用浸没沉淀相转化法制备PES/SPSf共混超滤膜,对所得共混膜进行SEM、纯水通量、BSA截留等性能表征,分析凝固浴组成亦即不同盐种类对PES/SPSf共混膜结构及性能的影响规律.结果表明:在不同凝固浴条件下所得PES/SPSf共混膜均为海绵体结构;当纯水作为凝固浴时,膜的纯水通量最低(920 L/(m2·h));当在凝固浴中添加盐时,所得膜的皮层厚度明显降低,特别当凝固浴为NaCl饱和溶液时,所得膜的皮层厚度仅为2.5μm,同时具有最低的静态水接触角(64°),纯水通量为1024 L/(m2·h).%In order to study the effect of coagulation bath composition on the structure and property of polyethersulfone (PES)/sulfonated polysulfone (SPSf) blend membrane, the PES/SPSf blend membranes were prepared via non-solvent induced phase separation using PES and SPSf as membrane materials, N,N-dimethylacetamide(DMAc) as solvent, PEG as pore forming agent and H2O as non-solvent addition. The PES/SPSf blend membrane was characterized by SEM, pure water flux, BSA rejection and so on. The effects of coagulation bath composition on the structure and performance of membrane were investigated. The results indicated that all the membranes obtained from the coagulation bath with different compositions possessed the sponge-like structure. The pure water flux of the obtained blend membrane was 920 L/(m2·h) when the pure water was employed as the coagulation bath. The thickness of skin layer reduced when a salt solution was added in the coagulation bath. Specially, the thickness of skin layer was 2.5μm and the water contact angle was 64°, and the pure water flux of the obtained blend membrane was up to 1024 L/(m2·h) when NaCl solution was used as the coagulation bath.