聚乙二醇对氯化聚氯乙烯超滤膜微观结构及其性能的影响

发布时间：2018-03-06 12:42

本文选题：氯化聚氯乙烯超滤膜　切入点：聚乙二醇　出处：《水处理技术》2017年09期 　论文类型：期刊论文

【摘要】：探讨了聚乙二醇(PEG)及其分子量对氯化聚氯乙烯(CPVC)铸膜液黏度及其超滤膜微观结构和性能(纯水通量、截留率、机械性能和耐污染性能)的影响。结果表明,随着PEG分子量的增大,CPVC铸膜液黏度增大,CPVC超滤膜表面由网络大孔结构变为致密结构,PEG400和600对CPVC超滤膜断面微观结构没有太大影响,仍然保持海绵状结构,PEG相对分子质量超过1 000以后,CPVC超滤膜断面变为指状大孔结构与皮层构成非对称结构。铸膜液中添加PEG后,CPVC超滤膜纯水通量大幅度上升,但是截留率有不同程度的下降;随着PEG分子量的增大,CPVC超滤膜的纯水通量,耐污染性能及截留率均呈上升趋势。综合比较,PEG600作为添加剂,CPVC超滤膜能获得较好的性能。
[Abstract]:The effects of polyethylene glycol (PEG) and its molecular weight on the viscosity of chlorinated polyvinyl chloride (CPVC) casting solution and the microstructure and properties of its ultrafiltration membrane (pure water flux, retention rate, mechanical property and pollution resistance) were investigated. With the increase of PEG molecular weight, the surface of CPVC ultrafiltration membrane changed from macroporous structure to dense structure. The cross-section of CPVC ultrafiltration membrane was changed into an asymmetric structure of finger macroporous structure and cortex after the relative molecular weight of PEG exceeded 1 000. The pure water flux of PEG ultrafiltration membrane increased significantly after adding PEG into the casting solution. With the increase of the molecular weight of PEG, the water flux, the resistance to pollution and the rejection rate of CPVC-UF membrane were all increasing, and the comparison of PEG600 as an additive could obtain better performance of UF membrane with the increase of molecular weight of CPVC.The results showed that the water flux, fouling resistance and rejection rate of CPVC-UF membrane increased with the increase of molecular weight of CPVCUF membrane.
【作者单位】：东华大学环境科学与工程学院国家环境保护纺织污染防治工程技术中心;
【分类号】：TQ051.893

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