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选用两种分子量的聚醚砜(PES)为膜材料,以N-甲基吡咯烷酮为溶剂,分别以聚乙二醇(PEG400、PEG6000)和聚乙烯吡咯烷酮(PVP K30)为添加剂,用非溶剂致相分离法制备了超滤膜,研究了添加剂种类及浓度对不同分子量PES超滤膜性能的影响,利用相图及铸膜液黏度数据,从热力学、动力学、聚合物聚集体大小角度对实验现象进行了解释.结果表明,同种添加剂时,随PES分子量增大制得超滤膜的过滤通量增大、截留率降低.不同添加剂时,PES超滤膜对PEG20000溶液的通量按添加剂为PEG400,PEG6000,PVP K30的顺序依次增大.添加剂为PVP K30、PEG400时PES超滤膜的截留率大于添加剂为PEG6000时PES超滤膜截留率.铸膜液配方相同,添加剂浓度增大时,制得超滤膜的厚度增大,过滤通量增大、截留率降低.
Polyethersulfone (PES) with two kinds of molecular weight was selected as the membrane material. Polyethylene glycol (PEG400, PEG6000) and polyvinylpyrrolidone (PVP K30) were used as the solvents and N-methylpyrrolidone The effects of additive type and concentration on the properties of PES ultrafiltration membranes with different molecular weights were studied. The phase diagrams and the viscosity data of the casting solution were used to study the effects of additives on the performance of PES ultrafiltration membranes. From the aspects of thermodynamics, kinetics and polymer aggregate size, The results show that with the same additives, the filtration flux of the ultrafiltration membrane increased with the increase of the molecular weight of PES, and the rejection decreased.When the different additives were added, the flux of PEG20000 solution by PES ultrafiltration membrane The order of PEG400, PEG6000 and PVP K30 increased in sequence.When the additives were PVP K30 and PEG400, the rejection of PES ultrafiltration membrane was larger than the rejection of PES ultrafiltration membrane when the additive was PEG6000.When the concentration of additive solution was increased , The thickness of the ultrafiltration membrane increases, the filtration flux increases, and the rejection rate decreases.