膜科学与技术

DMAc-GCTA混合溶剂对PVDF/P(AA-co-MMA)中空纤维膜的影响

作者：陈星妤，李燕，许振良，魏永明，杨虎

单位：化学工程联合国家重点实验室，上海市多相结构材料化学工程重点实验室，华东理工大学化学工程研究所膜科学与工程研发中心，上海20023

关键词：三乙酸甘油酯；PVDF中空纤维膜；共聚物

出版年,卷(期):页码： 2016,36(5):36-39

摘要：

本论文选用丙烯酸(AA)与甲基丙烯酸甲酯(MMA)溶液聚合制备无规共聚物P(AA-co-MMA)作为成孔剂，以二甲基乙酰胺（DMAc）和三乙酸甘油酯作为混合溶剂，通过NIPS过程纺制P(AA-co-MMA)/PVDF中空纤维膜。对P(AA-co-MMA)共聚物进行了FTIR，GPC等测试，并研究了二甲基乙酰胺（DMAc）和三乙酸甘油酯的比例对铸膜液的粘度，以及产物膜的结构、通量、截留的影响。结果表明：P(AA-co-MMA)共聚物的转化率为94%，平均相对分子量为146646；在PVDF/P(AA-co-MMA)/DMAc体系中，三乙酸甘油酯的最大添加量为混合溶剂的20%。随着三乙酸甘油酯含量的增大，粘度明显增大；纯水通量先增大后减小，但对PEG系列的截留率增大；扫描电镜结果表面随着三乙酸甘油酯的增加膜断面双指状孔逐渐减少并变短。

Random P(AA-co-MMA) synthesized by free radical solution polymerization of acrylic acid (AA) and methyl methacrylate (MMA) was used as pore forming agent，and the mixture of dimethyl acetamide (DMAc) and glyceryl triacetate as used as solvents，then P(AA-co-MMA)/PVDF hollow fiber membrane was prepared by NIPS method. P(AA-co-MMA) copolymer has been tested and analyzed by FTIR and GPC. The influence of the ratio of glyceryl triacetate on the performance and structure of P(AA-co-MMA)/PVDF hollow fiber membrane were investigated by viscosity test，flux and rejection，scanning electron microscopy(SEM).The results show that the conversion rate of P(AA-co-MMA) copolymer is 94%，and the Mv=146646；the maximum amount of the glyceryl triacetate in mixed solvent is 20%，otherwise，the casting solution is unstable and easy to gel at room temperature；with the increase of glyceryl triacetate，the viscosity increases，the pure water flux increases first and then decreases，but the PEG rejection rate increases，membrane section double finger holes gradually reduce and shorter.

第一作者简介：陈星妤（1992-），女，浙江温州人，硕士研究生，主要从事膜技术方面的研究工作。通讯联系人：Email: hyang@ecust.edu.cn

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