基于嵌段共聚物自组装的具有单分散纳米分离孔道温度敏感分离膜的设计

项目名称： 基于嵌段共聚物自组装的具有单分散纳米分离孔道温度敏感分离膜的设计

项目编号： No.51303129

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 冯霞

作者单位： 天津工业大学

项目金额： 25万元

中文摘要： 基于聚N-异丙基丙烯酰胺（PNIPAAm）的温度敏感分离膜在许多领域显示出诱人的应用前景。但传统方法制备的温度敏感膜由于膜孔尺寸及孔表面PNIPAAm分子链长度和密度不一致，响应性能远达不到应用的要求。本课题利用原子转移自由基聚合方法，设计、合成具有特定嵌段比、窄分子量分布的PS-b-PNIPAAm两亲嵌段共聚物，在嵌段共聚物自组装的基础上，采用一种简单易行，可控性好，无化学反应和质量损失的方法- - 两亲性嵌段共聚物选择性溶胀成孔法，设计一种孔径分布单一，孔表面PNIPAAm分布高度一致的纳米级多孔温敏薄膜。将该温敏薄膜与传统多孔分离膜相结合制备温度敏感复合膜。在温度变化时，温敏功能层将进行纳米级别的响应，所有膜孔的响应过程完全一致，与传统温度敏感分离膜相比，该方法制备的膜在响应速度和分离精度上将显示出很大优势。该方法有望发展成制备高性能温敏膜的一种普适性新方法，并有力推动温度敏感膜的应用。

中文关键词： 嵌段共聚物；自组装；分离膜；温度敏感；N-异丙基丙烯酰胺

英文摘要： The temperature-sensitive membranes based on poly(N-isopropylacrylamide)(PNIPAAm) show attractive application prospects in many fields. However, The responsive properties of temperature-sensitive membranes prepared by conventional approach are far beyond the reach of application because of the wide distribution of pore size and the difference of PNIPAAm chain length and density on membrane pore surface. In this project, the amphiphilic polystyrene(PS)-block-PNIPAAm copolymers with specific block ratio and narrow molecular weight distribution are designed and synthesized by atom transfer radical polymerization. The nano-porous PS-b-PNIPAAm temperature-sensitive membranes with monodisperse pore size and highly consistent of PNIPAAm distribution on pore surface are prepared by the method of selective swelling-induced pore-making process based on self-assembly of block copolymers. Compared to other methods to produce porous materials with well defined nanopores based on block copolymers, the selective swelling-induced pore-making process possesses synergic advantages that include extreme simplicity, good controllability, involvement of no chemical reactions, no weight loss,etc. The nano-porous PS-b-PNIPAAm membrane is combined with conventional separation membranes, and the temperature-sensitive composite membranes

英文关键词： block copolymer；self-assembly；membrane；temperature-sensitive；N-isopropylacrylamide