中文摘要：

以温敏聚氨酯（TSPU）材料为基膜,利用表面接枝改性技术将带有对pH敏感的官能团（丙烯酸）引发接枝到基膜的表面,成功制备了一种对温度、pH双重敏感的聚氨酯膜。红外光谱分析发现,在接枝膜的谱图上出现了羧基的特征吸收峰,说明丙烯酸已成功接枝到TSPU膜上。扫描电镜对接枝膜形貌观察表明,在TSPU膜的表面,具有明显的聚丙烯酸接枝物的存在。DSC分析显示,表面接枝改性对TSPU膜的微相分离结构和软段的结晶性能影响不大。当接枝时间控制在15￣20 min时,温度从45℃提高到55℃,接枝膜的水透过通量发生了显著变化;当pH值从4变化到5时,接枝膜的水透过通量也随之发生了明显改变。因此,通过表面接枝技术改性TSPU膜,可以成功制备出同时具有较好温敏特性和p H响应特性的智能膜材料。

英文摘要：

A kind of polyurethane membrane with thermal sensitivity and pH response was successfully prepared by using thermal sensitive polyurethane（TSPU） material as the matrix membrane and through the surface graft modification technology to induce and graft functional group（acrylic acid） of pH response on the surface of matrix membrane.The IR analysis shows that the characteristic absorption peaks of carboxyl appear on the spectrum of the graft membrane,so that acrylic acid is successfully grafted on the TSPU membrane.The graft membrane morphology was observed by SEM.The results show that there is obvious existence of the poly-acrylic acid graft copolymer on the surface of the TSPU membrane.DSC analysis shows that surface graft modification has a little influence on the microphase-separated structure of the TSPU membrane and crystallization properties of soft segment.When the grafting time was controlled between 15min to 20min,and the temperature increased from 45℃ to 55℃,the water permeation flux of graft membrane changed markedly.On the other hand,when the pH changed from 4 to 5,the water permeation flux of graft membrane also changed remarkably.Therefore,the intelligent membrane materials with better thermal sensitivity and pH response can be successfully prepared by suface graft technology modifying TSPU membrane.