纤维素纳米纤维接枝聚(N-异丙基丙烯酰胺)水凝胶的制备与表征  

Synthesis and Characterization of Poly(N-isopropyl acrylamide)-g-cellulose Hydrogels

作　　者：陈培珍[1] 刘瑞来[1,2] 饶瑞晔[1] 

机构地区：[1]武夷学院生态与资源工程学院,福建省生态产业绿色技术技术重点实验室,福建武夷山354300 [2]福建师范大学材料科学与工程学院,福州350007

出　　处：《应用化学》2016年第12期1389-1395,共7页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(51406141);福建省教育厅(JK2014052,2012055);南平市科技局(2011DJ10)资助项目~~

摘　　要：将具有温度响应的聚N-异丙基丙烯酰胺(PNIPAm)接枝到电纺纤维素纳米纤维膜上,制备温度响应型纤维素接枝聚N-异丙基丙烯酰胺(PNIPAm-g-Cell)纳米纤维水凝胶。研究接枝单体(N)与纤维素(c)的质量比、反应温度、反应时间和引发剂浓度对产物接枝率、溶胀性和形貌的影响。结果表明,最佳聚合反应条件为m(N)∶m(c)=15∶1、反应温度40℃、反应时间3 h、引发剂浓度为10 mmol/L,得到PNIPAm-g-Cell接枝率和溶胀率分别为35%和31%。与PNIPAm相比,PNIPAm-g-Cell水凝胶的低临界相转变温度(LCST)显著升高,说明亲水性纤维素的引入改变了体系的亲疏水平衡。去溶胀动力学测试表明,0.5 min内接枝率为25%和35%的水凝胶保水率分别降低至93%和61%。说明接枝率越高PNIPAm-g-Cell水凝胶对温度的响应速度越快,对温度越敏感。Thermally-responsive PNIPAm-g-cellulose nanofibers hydrogels were prepared by thermallyresponsive poly（ N-isopropyl acrylamide）（ PNIPAm） grafted electrospun cellulose nanofibrous membranes.The effect of mass ratio of monomer and cellulose,reaction temperature,reaction time and amounts of initiator on grafting rate,swelling rate and morphology were investigated. The results show that the optimum reaction condition are as follows： mass ratio of monomer and cellulose in 15∶ 1,reaction temperature at 40 ℃,reaction time for 3 h and initiator concentration of 10 mmol / L,the grafting rate and swelling rate of PNIPAm-g-Cell at35% and 31%,respectively. Compared with PNIPAm hydrogels,the lower critical solution temperature（ LCST） of PNIPAm-g-Cell hydrogels is obviously increased,indicating that hydrophilic-hydrophobic balance was changed by adding hydrophilic cellulose. Deswelling kinetics of the PNIPAm-g-Cell hydrogels shows that water-retention rate is decreased to 93% and 61% for grafting rate of 25% and 35%,respectively,in initiatory 0. 5 min. PNIPAm-g-Cell hydrogels with high grafting rate have greater sensitivity to temperature.

关 键 词：纤维素 聚N-异丙基丙烯酰胺 接枝 温度响应 水凝胶 

分 类 号：O631.2[理学—高分子化学]