Effect of Extractant and Cold-drawing on the Structure and Performance of FIDPE Hollow Fiber Membranes Fabricated via Thermally Induced Phase Separation Method

Microporous polyolefin hollow fiber membranes were prepared from high density polyethylene （HDPE）-paraffin solution via thermally induced phase separation （TIPS） method. Effects of extraction and cold-drawing condition on membrane structure and performance were investigated.Five volatile solvents were used as extractant. Dimension of hollow fiber and gas permeation rate of membrane were measured. Mierostructure of membrane was examined by Scanning Electronic Microscope （SEM）. The results show that the membrane treated by pentane possesses a higher porosity, nitrogen permeability and lower shrinkage than those of membranes extracted by other three extractants. It is also found that the membrane stretched 133% shows the highest porosity and gas permeability in this study.     

Effect of Extractant and Cold-drawing on the Structure and Performance of HDPE Hollow Fiber Membranes Fabricated via Thermally Induced Phase Separation Method

IntroductionMicroporous membrane is widely used in filter ,oxygenator , contactor and battery separator . Traditionally ,polymer membranes shaped as porous hollow fibres , areprepared using the diffusion induced phase separationtechnique or DIPS[1].Inthis process ,a polymer solution ofa polymer and a solvent is contacted with a non-solvent forthe polymer . Because of initial interdiffusion of solventand nonsolvent ,the concentration in the polymer solutionchanges and, finally , phase separat…     

后处理对聚丙烯中空纤维膜性能的影响

采用熔融挤出拉伸法制备了聚丙烯中空纤维膜，详细探讨了中空纤维的机械性能，尤其是各种条件对其弹性恢复性能的影响，研究发现后处理(热处理条件和牵伸比)对膜材料的孔隙率，平均孔径和气体的穿透性能有很大的影响，采用片晶和微纤模型可以很好地解释中空纤维膜的实验现象和成孔机理。