壳聚糖基三元智能水凝胶的制备及其敏感性  

Preparation and Sensitivity Behaviors of Chitosan-based Intelligent Hydrogels

作　　者：舒静[1] 冯晓荟[1] 郑丽娜[2] 桑希勤[1] 王丹丹[3] 

机构地区：[1]东北石油大学化学化工学院石油与天然气化工省重点实验室,黑龙江大庆163318 [2]大连海洋大学海洋环境工程学院,辽宁大连116023 [3]大庆油田有限责任公司第九采油厂,黑龙江大庆163853

出　　处：《材料工程》2013年第3期67-70,76,共5页Journal of Materials Engineering

基　　金：黑龙江省博士后落户基金资助(LBH-Q09193)

摘　　要：以戊二醛为交联剂,硝酸铈铵为引发剂,在壳聚糖(CS)/聚乙烯基吡咯烷酮(PVP)二元凝胶的基础上,通过引入聚乙烯醇(PVA),制备了具有温度和pH双重敏感性的CS基三元智能水凝胶。结果表明,PVA的引入可显著提高CS在体系中的用量,增加凝胶的温度敏感级数,增强敏感度。在PVA用量为6.25%(相对于PVP的质量分数,下同),0.4%交联剂,5.1%引发剂,80℃下反应6h的条件下,可获得最大溶胀率约为1500%的三元凝胶。CS基三元凝胶在实验考察的温度范围内具有四级温度敏感性,且在35℃附近有一显著敏感点;对不同的pH值具有较好的敏感性,敏感突变点在pH=2附近。Chitosan-based ternary intelligent hydrogels of pH/temperature-sensibility were prepared on the basis of chitosan/polyvinylpyrrolidone（CS/PVP）hydrogels with polyvinyl alcohol（PVA）introdu- cing,using glutaraldehyde as crosslinking agent and ammonium ceric nitrate as initiator. The results indicated that the introduction of PVA increased the concentration of CS in the hydrogels significantly and made the temperature-sensitive grade increase. Especially, the hydrogels indicated obvious tem- perature-sensitivity at 35℃. Under the optimal conditions, that is, 6.25%PVA（mass fraction, com- pared to PVP）, 5.1% initiator, 0.4% cross-linking agent, 80℃ and 6h, the maximum swelling ratio of hydrogels was about 1500%. Thermo-sensitive and pH-sensitive experiments showed that the hy- drogels were of excellent thermo-sensibility and pH-sensibility. The chitosan-based ternary hydrogels were of four grades temperature-sensitivity and good pH-sensitivity with the abrupt change point at 2.0.

关 键 词：壳聚糖(CS) 聚乙烯吡咯烷酮(PVP) 聚乙烯醇(PVA) 智能水凝胶 温度敏感性 PH敏感性 

分 类 号：O636[理学—高分子化学] TQ427[理学—化学]