摘要
采用双凝固浴法制备聚醚砜(PES)平板膜,通过改变第一凝固浴的组成,调控膜表面及内部的结构,研究了凝固浴条件对膜结构与渗透性能的影响.实验表明,当第一凝固浴中溶剂二甲基乙酰胺(DMAc)质量分数为0～70%时,随着DMAc质量分数的增加膜内部由指状孔向海绵状孔过渡,当DMAc质量分数达到70%时指状孔结构几乎完全消失,同时膜的表面在DMAc质量分数超过50%时出现开孔结构,且随浓度增加而增多.膜的性能也受到第一凝固浴DMAc质量分数的影响,当DMAc质量分数为0～50%时,膜的纯水通量随浓度上升而下降,牛血清白蛋白(BSA)截留率则变化不大,当DMAc质量分数超过50%时,膜表面出现开孔,纯水通量又开始上升,而截留率则显著下降.
Flat-sheet type polyethersulfone （PES） membranes are prepared by dual-bath coagulation method. The skin surface and cross-section structure of polyethersulfone （PES） membranes are controlled by changing the component of the first coagulating bath to investigate the effect of coagulation bath conditions on the structure and osmotic capability of PES membrane. The results show that the porous structure of cross-section changed from finger type to sponge type when the DMAc mass fraction increased from 0 to 70% in the first coagulating bath. When the DMAc mass fraction reaches 70%, the membrane porous structure is almost sponge type. Open porous structure appeares at the skin surface when DMAc mass fraction reaches 50%. When the DMAc mass fraction increases from 0 to 50%, the pure water flux declines and the BSA rejection rate changes a little. When the DMAc mass fraction exceedes 50%, the pure water flux rises and the BSA rejection rate declines observably.
出处
《天津工业大学学报》
CAS
2008年第4期12-15,共4页
Journal of Tiangong University
基金
国家自然科学基金资助项目(50473025)
天津市应用基础重点资助项目(043803911)
天津工业大学中空纤维膜材料与膜过程教育部重点实验室开放基金资助项目(060517)
关键词
双凝固浴
平板膜
超滤膜
聚醚砜
dual-bath coagulation
fiat-sheet type membrane
uhrafihration membrane
polyethersulfone
