【摘要】 采用可逆加成断裂链转移可控/"活性"聚合方法合成了丙烯腈与N-异丙基丙烯酰胺(NIPAM)的嵌段共聚物,通过调控嵌段聚合反应时间可以获得一系列不同嵌段链长的共聚物,分子量分布在1.3左右.运用静电纺丝技术制备了所合成嵌段共聚物的纳米纤维膜,扫描电镜照片表明纳米纤维膜较为均匀且直径可调.研究了纳米纤维膜表面水接触角与荧光标记牛血清清蛋白的吸附现象,接触角结果证实共聚物纳米纤维膜具有一定的温度响应性,且疏水性嵌段的引入导致响应温度较PNIPAM有所降低;蛋白质吸附结果则表明温度较低时纳米纤维膜表面更亲水,蛋白质吸附较少.所制备的温敏性纳米纤维膜可望用作智能分离与吸附材料.更多还原

【Abstract】 Diblock copolymers of acrylonitrile and N-isopropylacrylamide(NIPAM) were synthesized by reversible addition-fragmentation chain transfer polymerization and the molecular weight distribution was found to be around 1.3.Nanofibrous membranes were prepared from the resultant copolymers by electrospinning.Optimized conditions for the electrospinning were established.FESEM images elucidate that the nanofibers are uniform.Water contact angles on the copolymer membranes show distinct transition upon temperature,which is around 20 ℃.This decreased transition temperature can be attributed to the introduction of a relatively hydrophobic polyacrylonitrile block.Bovine serum albumin adsorptions at different temperatures also confirm the thermoresponsive properties of the membranes,i.e.at lower temperature the fiber surface is more hydrophilic,which is protein-resistant.This thermoresponsive nanofibrious membrane show great potential in intelligent separation.更多还原