具有亲水聚合物刷的高通量共混超滤膜的制备、结构调控及抗污染机理研究

项目名称： 具有亲水聚合物刷的高通量共混超滤膜的制备、结构调控及抗污染机理研究

项目编号： No.51263013

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 邱广明

作者单位： 内蒙古工业大学

项目金额： 50万元

中文摘要： 通过超临界二氧化碳RAFT活性共聚和接枝改性，设计并合成主链为苯乙烯/马来酸酐交替共聚物SMA，侧链接枝聚乙二醇PEG的梳状两亲共聚物PEG-SMA；将其与聚偏氟乙烯PVDF共混，并利用相转化法制备表面具有PEG刷的高通量、抗污染的PVDF共混超滤膜。研究超临界二氧化碳体系RAFT活性共聚机理和反应条件等因素的影响，控制PEG-SMA具有特定结构和分子量；研究共混体系的相容性和相分离过程热力学与动力学规律，揭示梳状两亲共聚物的表面迁移和自组装机制；研究柔性PEG刷对膜表面二维流场的影响以及对浓差极化所致边界层的影响，揭示膜表面亲水聚合物刷的抗污染机理。研究梳状两亲共聚物链结构和两亲共混体系成膜热力学/动力学协同效应对两亲共混膜表面介观结构以及膜分离性能的影响规律，揭示表面刷状亲水层同时提高共混膜水通量和截留率的机制。利用两亲共聚物的反应性基团固载半乳糖苷酶，实现PVDF共混膜进一步功能化。

中文关键词： 两亲刷状共聚物；共聚；共混；超滤膜；气液两相流

英文摘要： On basis of molecular design, The amphiphilic comb-like copolymers (PEG-g-SMA) with polyethylene glycol (PEG) chains grafted to poly(styrene-alt-maleic anhydride)(SMA) were synthesized via two routes. First, reversible addition-fragmentation chain transfer (RAFT) copolymerization of styrene(St) and maleic anhydride(Man) was performed in supercritical CO2 to synthesize alternating copolymer SMA, which subsequently was grafted with PEG by esterification reaction of anhydride groups and hydroxyl groups, aiming at preparation of amphiphilic copolymer PEG-g-SMA with a well-defined comb-like chain morphology. Second, the amphiphilic comb-like copolymers (PEG-g-SMA) were synthesized in supercritical CO2 used as the reaction medium by RAFT copolymerization of 4-PEG grafted styrene(PEG-g-St) and maleic anhydride. Moreover, PEG-g-St was obtained by Williamson reaction of 4-vinyl benzyl chloride and mPEG. For the comb-like copolymers PEG-g-SMA, The alternating structure was confirmed by 13C NMR analyses and the living character was checked by quantitative UV analysis of the dithiobenzoyl end group of the polymer chains. These amphiphilic copolymers were used to blend with PVDF in the preparation of polymric blend membranes by phase inversion method. Based on the analysis of membrane-forming thermodynamics and kinetics, the

英文关键词： amphiphilic brush-like copolymer；copolymerization；blend；ultrafiltration membrane；gas-liquid two phase flow