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反应控制相转化法制备PVDF/SMA-g-PEG膜及性能研究

作者：贾旭莹，christine n. matindi，崔振宇，李建新

单位： 1.天津工业大学材料科学与工程学院，天津 300387；2.天津工业大学分离膜与膜过程国家重点实验室

关键词：聚偏氟乙烯；聚苯乙烯-马来酸酐；聚乙二醇；反应-控制相转化法；共混超滤膜；

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2023,43(5):74-82

摘要：

本文依据Schneier混合焓变理论计算预测、Flory-Huggins理论系统分析了聚偏氟乙烯（PVDF）/聚苯乙烯-马来酸酐（SMA）共混体系的相容性。结果表明，当PVDF/SMA共混质量比＞88/12或＜20/80 时，体系为完全相容系统。此外，以mPVDF:mSMA=88:12为聚合物（质量分数为16%），二甲基乙酰胺（DMAc）为溶剂，聚乙二醇（PEG）（相对分子量为20000 ）为致孔剂和反应物，配制出均相聚合物溶液（50 oC）。根据酯化反应进程，终止反应，视反应体系为铸膜液，采用非溶剂诱导相转化法制备共混超滤膜。随着SMA与PEG之间发生酯化反应和接枝聚合物SMA-g-PEG的合成，溶液粘度从最初的780 mPa•s增至6580 （mPa•s64 h），并出现凝胶化。以反应时间为48 h的铸膜液所制得的超滤膜，其纯水渗透率高达458.6 L/(m2•h•MPa)，BSA截留率为96.6%，通量恢复率为78.9%，表现出优异的抗污染性能和分离性能。

The compatibility of PVDF/SMA blends was systematically analyzed according to the calculation and prediction of Schneier mixing enthalpy change theory, Flory-Huggins theory . A PVDF/SMA (88/12 wt./wt.)/DMAC homogeneous casting solution system (polymer concentration of 16 wt.%) was prepared, and PEG with molecular weight of 20 kDa (16 wt.%) was added as additive and ragent to control the esterification reaction between SMA and PEG(50 ℃).With the progress of esterification reaction between SMA and PEG and the synthesis of graft polymer SMA-g-PEG, the solution viscosity increased froml 780 mPa•s to 6580 mPa•s (64 h), and gel occurred. According to the esterification reaction process, the reaction is terminated, and the reaction system is considered as casting solution. The PVDF/SMA-g-PEG ultrafiltration membrane prepared from the casting solution with a reaction time of 48 hours has a pure water permeability up to 480.7 L m-2h-1 bar, a BSA retention rate was 96.6%, and a flux recovery rate was 78.9%. It exhibits excellent anti fouling and separation performance.

基金项目：

国家自然科学基金项目“面向镁锂高效分的冠醚基聚酰（亚）胺包覆膜系统构建离子选择性分离机制”（项目编号：22278318）。

作者简介：

贾旭莹（1996-），女，河北人，硕士，研究方向为膜制备，E-mail：18132789681@163.com

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