膜科学与技术

PSf/SPES共混相容性及其对膜形态结构和性能的影响规律

作者：赵宝宝¹，²，李诗文¹，³，付振刚¹，³，钱晓明²，李建新¹，³

单位： 1. 天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验室培育基地，天津，300387； 2. 天津工业大学纺织学院，天津，300387；3. 天津工业大学材料科学与工程学院，天津，300387

关键词：聚砜；磺化聚醚砜；相容性；溶液相转化法；超滤膜

出版年,卷(期):页码： 2015,35(5):6-12

摘要：

针对聚砜（PSf）和磺化聚醚砜（SPES）聚合物共混体系相容性，首先通过混合焓法计算预测并用差示扫描量热法（DSC）进行了分析。结果表明二者为部分相容体系，且相容性随共混比的增大呈下降趋势。此外，以N，N-二甲基乙酰胺（DMAc）为溶剂，采用浸没沉淀相转化法制备出PSf/SPES共混平板超滤膜，系统研究了共混相容性对膜形态结构及性能的影响规律。结果表明：当PSf/SPES共混比小于90/10时，聚合物共混具有较好的相容性，所制备共混膜的断面为梯度分布的海绵网络孔结构，且亲水性、表面孔孔径、孔隙率和纯水通量等均随着共混比的增大而增大。其中，当PSf/SPES=92/8时，膜的纯水通量达到1397 L/(m2·h)，对牛血清蛋白（BSA）截留率为85%。随着PSf/SPES共混比进一步增加，共混体系相容性变差，膜的断面出现指状孔结构，BSA截留率显著下降。

The compatiblity of polysulfone (PSf) and sulfonated polyethersulfone (SPES) blend system with different mass ratios was predicted by mixing enthalpy calculation and characterized by differential scanning calorimetry (DSC). The PSF/SPES blend membranes were prepared by non-solvent induced phase separation (NIPS). The effects of blending compatiblity on the structure and performance of PSF/SPES blend membranes were investigated. The results showed that the PSf/SPES blend system with PSf/SPES mass ratio less than 90/10 was a partial compatiblity and the compatiblity decreased with the increase of PSf/SPES mass ratio. Further, the PSF/SPES blend membranes with the mass ratio less than 90/10 obtained exhibited gradient sponge-like asymmetrical structure. The hydrophilcity, surface pore size, porosity and pure water flux of the obtained blend membrane increased with an increase in PSf/SPES mass ratio. When PSf/SPES mass ratio was 92/8, the pure water flux of blend membrane obtained was 1397 L/ (m2·h) and BSA rejection was higher than 85%. The PSf/SPES blend system with PSf/SPES mass ratio more than 90/10 was immiscible. The blend membranes obtained appeared finger-like pores and the rejection for BSA observably decreased.

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