在NaCl溶液中以海藻酸钠为致孔剂制备快速温度响应型多孔聚(N-异丙基丙烯酰胺)水凝胶  

PREPARATION OF FAST TEMPERATURE RESPONSIVE POROUS POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS USING SODIUM ALGINATE AS PORE-MAKING AGENT IN SODIUM CHLORIDE SOLUTIONS

作　　者：张高奇[1] 查刘生[2] 梁伯润[2] 

机构地区：[1]浙江传化股份有限公司技术中心,杭州311215 [2]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海200051

出　　处：《高分子学报》2009年第7期633-637,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50573009)资助项目

摘　　要：用海藻酸钠为致孔剂,在NaCl水溶液中制备了多孔聚(N-异丙基丙烯酰胺)(PNIPAAm)水凝胶,分别用扫描电镜(SEM)和小角X光散射(SAXS)对PNIPAAm水凝胶的多孔结构进行了表征.结果发现,PNIPAAm水凝胶网络中的孔洞相互贯通,随着反应介质中NaCl浓度的增加,孔洞尺寸逐渐增大,孔洞排列越来越有序.相应地,PNIPAAm水凝胶的消溶胀速率随着反应介质中NaCl浓度的增加而提高.当NaCl浓度为0.6 mol/L时制备的PNIPAAm水凝胶,从室温处于平衡溶胀状态快速转移到45℃水介质中,1 min后凝胶的水保留率不足15%,4 min后消溶胀就达到平衡状态.Porous poly（N-isopropylacrylamide） （PNIPAAm） hydrogels were prepared using sodium alginate（SA） as pore-making agent in aqueous NaCl solutions. The porous structure of the PNIPAAm hydrogels was confirmed by SEM and SAXS, and the results showed that the pores in the hydrogels were interconnected and their pore sizes were increased with the NaCl concentrations used in the polymerization media. Accordingly, the deswelling rates of the porous hydrogels were enhanced with the NaCl concentrations. The water retention ratio of the porous PNIPAAm hydrogel prepared in 0.6 mol/L NaCl aqueous solution was less than 15% within 1 min when the equilibriumswollen hydrogels at room temperature was transferred into the aqueous medium at 4522, and the deswelling equilibrium was achieved within 4 min. The porous structure of the PNIPAAm hydrogels may be caused by the micoparticles formed by coil-to-globule transition of sodium alginate chains in the NaCI solution.

关 键 词：聚(N-异丙基丙烯酰胺) 海藻酸钠 温敏性水凝胶 快速响应 多孔结构 

分 类 号：O633.22[理学—高分子化学]