作者：Chen, Kaikai Xiao, Changfa Huang, Qinglin* Liu, Huan Liu, Hailiang Wu, Yanjie Liu, Zhen
关键字：Poly(tetrafluoroethylene-co- hexafluoropropylene) (FEP) Hollow fibermembrane Stretching Hydrophobicity Vacuummembrane distillation
论文来源：期刊
具体来源：Desalination
发表时间：2015年
Poly(tetrafluoroethylene-co-hexafluoropropylene)(FEP) hydrophobic hollow fiber membranes were prepared throughmelt spinningmethod. The performances and structures ofmembrane sampleswith different stretching ratios were investigated. It can be seen that the increased stretching ratios (nascent, 50%, 100% and 150%) brought about obvious interfacial microvoids (IFMs)which improved themembrane''s porosity,while decreased the liquid entry pressure (LEP) and mechanical strength. In addition, the FEP hollowfibermembranes exhibited strong hydrophobicity, excellent chemical and thermal stability owing to its perfluoro structure. Therefore, the performances of membrane samples were measured by vacuum membrane distillation (VMD) using alkaline aqueous with high temperature. The results showed that the FEP hollow fiber membranes'' salt rejections achieved as high as 99.0%. In addition, the MD flux, salt rejection and mechanical strength kept stable in the strong alkaline aqueous (NaOHconcentration of 300 g/L, 80 °C) through a long termoperation of 48 h. However, the compared poly(vinylidenefluoride) (PVDF) hollow fiber membrane exhibited weak alkaline and thermal
endurance with obvious decrease of mechanical strength and salt rejection. Therefore, this study indicated that the obtained FEP hollow fibermembrane could be used in the VMD which exhibited satisfying salt rejection.