PNIPAAm/CMC半互穿网络水凝胶的合成及性质  

Synthesis and Characterization of PNIPAAm/CMC Semi-IPN Hydrogel

作　　者：于跃芹[1] 李延顺[1] 祝纯静[1] 刘玲秀[1] 

机构地区：[1]青岛科技大学化学与分子工程学院,生态化工教育部重点实验室,山东青岛266042

出　　处：《高分子材料科学与工程》2011年第2期13-15,共3页Polymer Materials Science & Engineering

基　　金：山东省自然科学基金资助项目(Y2006B10);青岛市科技计划基础研究项目(09-1-3-33-JCH)资助

摘　　要：以N-马来酰化壳聚糖为交联剂,N-异丙基丙烯酰胺(NIPAAm)为单体,羧甲基纤维素钠(CMC)为半互穿材料,在水溶液中通过自由基聚合制备了PNIPAAm/CMC半互穿网络水凝胶。所合成的水凝胶的低临界溶解温度(LCST)在33℃左右,CMC的加入对水凝胶的LCST无显著影响,但随着CMC用量的增加,水凝胶的温度敏感性会逐渐减弱。25℃时水凝胶的溶胀速率和饱和溶胀度均随CMC用量增大而增大。溶胀介质的离子强度对水凝胶的溶胀性能有显著影响,在浓度高于0.05 g/mL(离子强度0.854 mol/L)的NaCl溶液中水凝胶的饱和溶胀度明显下降。The poly（N-isopropylacrylamide） /sodium carboxymethylcellulose semi-interpenetrating polymer network（PNIPAAm/CMC semi-IPN） hydrogels were prepared with the N-maleoyl chitosan（N-MACH） cross-linker by redox polymerization in aqueous solution.The lower critical solution temperature（LCST） of the hydrogels is at about 33 ℃,which does not changed with the introduction of CMC,but the sensitivity of the hydrogel may decrease with the increase of CMC content.At 25 ℃,the swelling rate and equilibrium swelling ratio of the hydrogel increase with the increase of CMC content.The equilibrium swelling ratio is also influenced by the ionic strength of the swelling media.The swelling ratio decreases evidently in 0.05 g/mL NaCl solution（ionic strength = 0.854 mol/L）.

关 键 词：PNIPAAm/CMC水凝胶 半互穿网络 温敏性 溶胀 

分 类 号：TQ316.6[化学工程—高聚物工业]