Synthesis and Properties of pH-responsive Cellulose-g-PAA Nanofiber Hydrogels
LIN Hao1, HU Jiapeng1, LIU Ruilai1,2, RAO Ruiye1
1 Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecological and Resource Engineering, Wuyi University, Wuyishan 354300; 2 Key Laboratory of Polymer Materials of Fujian Province, College of Material Science and Engineering, Fujian Normal University, Fuzhou 350007
Abstract: 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 strengthincreased from 0 mol/L to 0.15 mol/L. This research provides a new approach to fabricate hydrogels with great sensitivity to pH value.
1 Yilmaz M D, Kati A. Encapsulation and pH-responsive release of an optical brightener (CBUS) from chitosan microcontainers for optical bleaching of cellulosic fabrics[J]. Cellulose, 2015,22(6):4077. 2 Altomare L, Cochis A, Carletta A, et al. Thermo-responsive methylcellulose hydrogels as temporary substrate for cell sheet biofabrication[J]. J Mater Sci Mater Med, 2016,27(5):345. 3 Olosa A, Kruener B, Jaeckel N, et al. Electrospinning and electrospraying of silicon oxycarbide-derived nanoporous carbon for supercapacitor electrodes[J]. J Power Sources, 2016,313:178. 4 Ma W, Zhang Q, Hua D, et al. Electrospun fibers for oil-water se-paration[J]. RSC Adv, 2016,6(16):12868. 5 Liu H Q, Zhen M, Wu R H. Ionic-strength- and pH-responsive poly acrylamide-co-(maleilc acid) hydrogel nanofibers[J]. Macromol Chem Phys, 2007,208(8):874. 6 Cao S G, Hu B H, Liu H Q. Synthesis of pH-responsive crosslinked poly styrene-co-(maleic sodium anhydride) and cellulose composite hydrogel nanofibers by electrospinning[J]. Polym Int, 2009,58(5):545. 7 Deng F, Ge X, Zhang Y, et al. Synthesis and characterization of microcrystalline cellulose-graft-poly(methyl methacrylate) copolymers and their application as rubber reinforcements[J]. J Appl Polym Sci, 2015,132(41):42666. 8 Isiklan N, Kursun F. Synthesis and characterization of graft copolymer of sodium alginate and poly(itaconic acid) by the redox system[J]. Polym Bull, 2013,70(3):1065. 9 Routray C, Tosh B. Controlled grafting of MMA onto cellulose and cellulose acetate[J]. Cellulose, 2012,19(6):2115. 10Liu Ruilai, Liu Junshao, Liu Haiqing. Fabrication of PLLA and CA composited porous ultrafine fibers nanofibers[J]. Acta Polym Sin, 2013(10):1312(in Chinese). 刘瑞来, 刘俊劭, 刘海清. 聚乳酸/醋酸纤维素复合多孔超细纤维的制备[J]. 高分子学报, 2013(10):1312. 11Chen Peizhen, Liu Ruilai, Rao Ruiye. Synthesis and properties of poly(N-isopropylacrylamide)-g-cellulose hydrogels[J]. Chin J Appl Chem, 2016,33(12):1389(in Chineses). 陈培珍, 刘瑞来, 饶瑞晔. 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[J]. 应用化学, 2016,33(12):1389. 12Liu R L, Ye H Y, Xiong X P, et al. Fabrication of TiO2/ZnO composite nanofibers by electrospinning and their photocatalytic property[J]. Mater Chem Phys, 2010,121(3):432. 13Yu H F, Fu G Q, He B L. Preparation and adsorption properties of PAA-grafted cellulose adsorbent for low-density lipoprotein from human plasma[J]. Cellulose, 2007,14(2):99.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
