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Effects of post-treatment on the structure and properties of PVDF/FEP blend hollow fiber membranes

机译：后处理对PVDF / FEP共混中空纤维膜结构和性能的影响

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摘要

Polyvinylidene fluoride (PVDF)/poly(tetrafluoroethylene-co-hexafluo-ropropylene) (FEP) blend hollow fiber membranes were prepared by the melt-spinning method. The effects of drawing conditions (drawing ratio and temperature) on the structure and properties of the membranes were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and analysis of membrane morphology. The storage modulus increased with increasing drawing temperature at the same drawing ratio, which improved the membrane's elasticity. The quantity and pore size of the interfacial microvoids both increased significantly with an increase in the drawing ratio at the same drawing temperature. Finally, the membranes were evaluated for their performance in vacuum membrane distillation (VMD). All the membranes had a salt rejection higher than 99.0%.
机译：采用熔融纺丝法制备了聚偏二氟乙烯（PVDF）/聚（四氟乙烯-六氟代丙烯共聚物）（FEP）共混中空纤维膜。通过差示扫描量热法（DSC），动态力学分析（DMA）和膜形态分析研究了拉伸条件（拉伸比和温度）对膜结构和性能的影响。在相同的拉伸比下，储能模量随拉伸温度的升高而增加，从而提高了膜的弹性。在相同的拉伸温度下，随着拉伸比的增加，界面微孔的数量和孔径均显着增加。最后，评估了膜在真空膜蒸馏（VMD）中的性能。所有膜的脱盐率均高于99.0％。

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