膜科学与技术

聚偏氟乙烯中空纤维膜的制备

作者：李亚静，田鵾鹏，吕晓龙

单位：天津工业大学生物化工研究所

关键词：聚偏氟乙烯；干-湿相转化法；添加剂；中空纤维膜

出版年,卷(期):页码： 2011,31(1):35-40

摘要：

本实验采用干-湿相转化法制备聚偏氟乙烯（PVDF）中空纤维膜。实验结果表明，随着纺丝原液中添加剂PEG含量的升高，膜的结构趋于疏松，膜的水通量增大，膜对牛血清的截留率都在98%以上，并保持了良好的机械性能；随着纺丝原液中添加剂PVP含量的升高，膜的结构过于疏松，压密化现象明显，致使膜的水通量减小，膜对牛血清白蛋白的截留率上升，机械性能明显下降；共同加入PEG和PVP并保持总量不变，改变二者的比例关系，随着PVP在添加剂中所占比例增多，纯水通量先上升后由于压密作用而下降，泡点、破裂压力、断裂强力、拉伸伸长率均下降。随着添加剂中PVP含量从0%增加到28.8%，膜对牛血清白蛋白的截留率从98.0%骤降到64.1%，之后，随着添加剂中PVP含量再增加，截留率基本维持在60%左右。

In this thesis, polyvinylidene fluoride (PVDF) hollow fibers membrane are fabricated by using dry-wet phase inversion method. The results showed that membranes morphology structure became looser with the increase of PEG concentration, which leaded to increase of water fluxes, the rejection of BSA over 98% , and good mechanical properties. As the PVP concentration in the spinning dope increasing, the membrane structure tended to loose, mechanical properties decreased significantly, however, the water fluxes decreased and the rejection increased, due to the densification effect. The total contents of PEG and PVP maintained the same and changed the ratio of them. With the proportion of PVP in the additive increasing, pure water flux increased at first, then decreased due to densification effects, and bubble point, break pressure, breaking strength and tensile elongation decreased. With the PVP content in the additive from 0% to 28%, the rejection of BSA decreased from 98.0% to 64.1%, and remained around 60%, when the proportion of PVP in the additive increased.

李亚静，女（1983-），河北石家庄人，硕士研究生，主要从事血液分离用PVDF中空纤维膜的制备研究，E-mail: duck10625@yahoo.com.cn；通讯联系人，吕晓龙(1964-)，教授，主要从事中空纤维膜材料与膜过程研究，E-mail: luxiaolong@263.net

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