环境刺激响应性聚偏氟乙烯/凹凸棒石复合超滤膜制备及抗污染易清洁性能

项目名称： 环境刺激响应性聚偏氟乙烯/凹凸棒石复合超滤膜制备及抗污染易清洁性能

项目编号： No.21476094

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 周守勇

作者单位： 淮阴师范学院

项目金额： 85万元

中文摘要： 围绕新型高分子分离膜设计制备中的共性问题，以膜材料结构和表面性质协同调控实现膜污染的源头控制为目标，采用环境刺激响应性高分子改性凹凸棒石共混调控聚偏氟乙烯超滤膜结构与性能，同步实现膜表面和膜孔壁的均匀及持久改性，制备集无机纳米纤维改性和刺激响应高分子改性于一体的新型抗污膜。通过接枝聚合反应将刺激响应高分子锚定在凹凸棒石表面，设计合成具有刷状链结构形态的共混改性剂，研究接枝聚合条件对接枝链结构的影响规律；采用浸没沉淀相转化法制备复合超滤膜，系统研究无机纳米纤维、敏感性高分子刷状链结构及相转化过程对膜结构和性能的影响规律，探讨敏感性高分子刷状链结构与复合膜抗污染及易清洁性能之间的关系，阐明复合膜的抗污染及易清洁机制，建立新型抗污染易清洁复合超滤膜设计、制备以及结构和性能优化控制的基本方法和理论。这对研制具有高抗污染和易清洁特性的新型高分子超滤膜具有指导意义，为提高膜应用的针对性提供新思路。

中文关键词： 聚偏氟乙烯超滤膜；纳米凹凸棒石；环境刺激响应性；抗污染；易清洁

英文摘要： Owing to good membrane-forming and excellent physicochemical properties, polymer membranes have gained extremely popularities in membrane filtration. Unfortunately, hydrophobic nature of polymers always accumulates adsorptions or depositions between membrane surfaces and organic foulants (NOMs, pathogens, polysacchrides and proteins, etc.) in water, which subsequently decreases membrane permeation flux. Fouling is one of the greatest obstacles in the widespread implementation of membranes for liquid purification. To improve membrane fouling resistance and easy-cleaning, and enhance filtration performance, the nanocomposite poly (vinylidene fluoride) (PVDF) ultrafiltration membrane exhibiting high efficiency of membrane clean in protein separation will be prepared by blending with stimuli-responsive polymer (SRP) grafted nanoattapulgite (NATP). A series of novel stimuli-responsive nanocomposite additive (SRP-g-NATP), coupling of hydrophilic modifier, selfdispersant, and pore-forming agent (porogen), will be synthesized by the surface modification of nanoattapulgite with stimuli-responsive polymer via grafting from polymerization. The synthesis process,reaction conditions,and mechanisms will be studied in detail.The nanocomposite membrane of poly(vinylidene fluoride) (PVDF) and SRP-g-NATP will be fabricated by wet phase inversion method. The effects of the SRP-g-NATP and manufacture process on structures, morphologies, surface composition, and chemistry of the nanocomposite membranes will be sysmatically investigated by varieties of spectroscopic and microscopic characterization techniques. Furthermore, the rejection behavior, antifouling performance and easy-cleaning properties of the nanocomposite membrane will be evaluated by filtering protein aqueous solution. The fouling resistance abilities of the membranes will be evaluated by the reduction of flux. The flux recovery ratio will be used to evaluate the hydraulic cleaning efficiency and easy-cleaning properties of the membrane. The relationship between separation performance and the structure characters of the stimuli-responsive polymers structure will be determined. On the meanwhile, we can obtain some new theory and method about the fouling resistance and easy-cleaning membrane, which also provide some experience in the aspect of membrane material design, preparation and application. This work also may afford a new idea for studying and developing polymer separation membranes.

英文关键词： PVDF ultrafiltration membrane;nanoattapulgite;stimuli-responsive;antifouling;easy-cleaning