纤维素纳米纤维接枝聚丙烯酸pH响应水凝胶的制备及性能  

Synthesis and Properties of pH-responsive Cellulose-g-PAA Nanofiber Hydrogels

作　　者：林皓 胡家朋 刘瑞来 饶瑞晔[1] LIN Hao HU Jiapeng LIU Ruilai RAO Ruiye(Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecological and Resource Engineering, Wuyi University, Wuyishan 354300 Key Laboratory of Polymer Materials of Fujian Province, College of Material Science and Engineering, Fujian Normal University, Fuzhou 350007)

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重点实验室,武夷山354300 [2]福建师范大学材料科学与工程学院福建省高分子材料与工程重点实验室,福州350007

出　　处：《材料导报》2017年第18期55-58,共4页Materials Reports

基　　金：国家自然科学基金(51406141);福建省教育厅项目(JK2014052;JZ160333)

摘　　要：以硝酸铈铵为引发剂,将具有pH响应的聚丙烯酸(PAA)接枝到电纺纤维素(Cell)纳米纤维膜上,制备了pH响应纤维素接枝聚丙烯酸(Cell-g-PAA)纳米纤维水凝胶。研究了接枝单体丙烯酸(N)与纤维素(c)质量比对Cell-g-PAA形貌、接枝率和溶胀性的影响。结果表明:m(N)∶m(c)值从5增加到10,接枝率从11%急剧增加到28%,然后趋于平稳;而m(N)∶m(c)值从5增加到15,溶胀率从(15.2±1.6)g/g增加到(46.1±4.9)g/g,然后下降。同时,研究了pH值和离子强度对水凝胶溶胀率的影响,pH值从2.2增加到7.8时,水凝胶的溶胀率从(31.3±2.5)g/g增加到(42.7±3.2)g/g,pH值进一步增大,溶胀率降低;溶液中离子强度从0mol/L增加到0.15mol/L,水凝胶溶胀率从(36.2±2.6)g/g降低到(21.4±1.4)g/g。本研究为制备快速响应pH水凝胶提供了一种新方法。Cellulose-g-PAA nanofiber hydrogels with pH-responsive were synthesized by graft copolymerization of pH-responsive polyacrylic acid（PAA）on to electrospun cellulose nanofibrous membranes with ammonium ceric nitrate as initiator.The effect of m（N）/m（c）on the morphology,grafting rate and swelling rate of cell-g-PAA nanofiber hydrogels were investigated.The results showed that the grafting rate of cell-g-PAA nanofiber hydrogels rapidly increased from 11% to 28% with increasing m（N）/m（c）from 5 to 10,and then leveled off.The swelling rate of cell-g-PAA nanofiber hydrogels increased from（15.2±1.6）g/g to（46.1±4.9）g/g with increasing m（N）/m（c）from 5 to 15,and then decreased.The effect of pH and ionic strength on the swelling rate of hydrogels were investigated.When the pH value changed from 2.2 to 7.8,the swelling rate increased from（31.3±2.5）g/g to（42.7±3.2）g/g,and then decreased.Moreover,the swelling rate decreased from（36.2±2.6）g/g to（21.4±1.4）g/g when ionic strength increased from 0 mol/L to 0.15 mol/L.This research provides a new approach to fabricate hydrogels with great sensitivity to pH value.

关 键 词：纤维素 聚丙烯酸 接枝 PH响应 水凝胶 

分 类 号：O631.2[理学—高分子化学]