高等学校化学学报

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熔融纺丝-拉伸法PVDF中空纤维膜及其油水分离性能

高翼飞,肖长发,冀大伟,黄阳正   

  1. 天津工业大学
  • 收稿日期:2020-08-31 修回日期:2020-11-24 出版日期:2020-11-25 发布日期:2020-11-25
  • 通讯作者: 肖长发

Preparation of PVDF Hollow Fiber Membranes Via Melt-spinning and Stretching Method and its Oil-water Separation Performance

  • Received:2020-08-31 Revised:2020-11-24 Online:2020-11-25 Published:2020-11-25

摘要: 本文以聚偏氟乙烯(PVDF)为成膜聚合物,聚全氟乙丙烯(FEP)为添加剂、聚乙二醇(PEG)和氯化钙(CaCl2)为复合成孔剂,采用熔融纺丝-拉伸法制备了PVDF中空纤维膜. 在制膜过程中未使用其它溶剂和稀释剂,可以实现相对绿色的制膜过程. 分析和讨论了拉伸比对PVDF中空纤维膜结构与性能的影响,对其孔径分布、力学性能和油水分离性能等进行了测试表征. 结果表明,进行拉伸后处理的膜形成的孔径分布较窄,在油包水乳液分离测试中,分离效率均在97%以上,表现出良好的油水分离效果.

Abstract: Nowadays, green chemistry is attracting more and more attention. In this paper, PVDF hollow fiber membranes were prepared by environment-friendly melt spinning and stretching method without any solvent and diluent involved in membrane preparation process. In particular, we selected perfluoroethylene propylene (FEP) as the dispersed phase and water-soluble polyethylene glycol (PEG) and calcium chloride (CaCl2) as the pore-forming agents. The influence of stretching ratio on the structure and properties of PVDF hollow fiber membranes were studied in detail based on pore size distribution, mechanical properties and oil-in-water emulsion separation performance. The results show that the dispersed phase and pore-forming agents can be uniformly dispersed in the matrix phase, the pore size distributions are relatively narrow. With the increase of the stretching ratio, the mean pore sizes and porosities of the membranes also increase. Meanwhile, the hydrophobility of the membranes decrease, but the water contact angles are all above 100°. The M-3 membrane shows a good mechanical property and separation effect for oil-in-water emulsion, of which the tensile strength can up to 19.3 MPa and the separation effects are all more than 97% at -0.02 MPa after ten cycles. The all results demonstrate that the membrane is potentially applicable in oil-water separation process.

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