以不同分子量和用量的聚乙二醇(PEG)作为壳聚糖(CS)超滤膜的添加剂,测定膜在不同进水压力下的渗透通量和截留率,同时对膜表面进行电镜扫描观察,探讨了PEG对CS膜性能和结构的影响规律.结果表明,PEG分子量(M)和含量(C)均能显著影响膜表面的微观形态,随着M和C增加,膜表面的粗糙程度逐渐增强,颗粒状结构越来越明显,颗粒粒径和微孔尺度也不断增大,膜性能表现为渗水通量逐渐增大和对BSA的截留率不断减小.当PEG分子量达到1 000时,对膜的微观结构影响十分显著,渗水通量急剧上升,截留率则迅速降低.当PEG800用量达10%、PEG1000用量达8%时,粒状结构突变为片状,表面孔密集成缝,当用量进一步增大时,由于水溶胀性过大,造成膜无法获取.
A series of CS membranes were fabricated which PEG served as additive with different molecular weight (M) and dosage(C).Their permeate flux(F) and rejection ratio(R) were tested under different hy-draulic pressure, scanning electron microscope(SEM) was also used to discuss the influence law of PEG on the property and structure of CS membranes.The results indicated that, microcosmic texture of membrane surface was evidently affected by M and C.With the increase of M or C, micro-surface texture became more rough, granulation degree of membrane became more obvious, size of micropore increased unceasingly as granule radius became larger,and F raised gradually, R became smaller continually.The addition of PEG1000 lead to a dis-tinct change in membrane micro- surface, accompanied by a sharp rise in F and a rapid decrease in R.It had been observed that granule on the membrane surface became patch when the dosage of PEG800 and PEG1000 were 10% and 8% , at the same time, slot appeared as pores connected.With the further increase in dosage of PEG800 and PEG1000, CS membrane cannot be obtained for water swelling augmenting.
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