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m_(PVDF)∶m_(SMA)=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℃).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,溶液黏度从最初的780 mPa·s增至6580mPa·s(64 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4807 L/(m^(2)·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)/DMAC homogeneous casting solution system(polymer concentration of 16%)was prepared,and PEG with molecular weight of 20000(16%)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 4807 L/(m^(2)·h·MPa),a BSA retention rate was 96.6%,and a flux recovery rate was 78.9%.It exhibits excellent anti fouling and separation performance.
作者
贾旭莹
Christine N.Matindi
崔振宇
李建新
JIA Xuying;Christine N.Matindi;CUI Zhengyu;LI Jianrin(School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300387,China;State Key Laboratory of Separation Membrane and Membrane Process,Tianjin University of Technology,Tianjin 300387,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2023年第5期74-82,共9页
Membrane Science and Technology
基金
国家自然科学基金项目(22278318)。
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
polyvinyl chloride
styrene-maleic anhydride
polyethylene glycol
reaction-controlled phase inversion
blend ultrafiltration membrane
