Zerpa Alyssa, Pakzad Leila, Fatehi Pedram
Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7B 5E1.
ACS Omega. 2018 Jul 24;3(7):8233-8242. doi: 10.1021/acsomega.8b01176. eCollection 2018 Jul 31.
In this study, hydrogels were synthesized through the radical polymerization of hardwood kraft lignin, -isopropylacrylamide, and ,'-methylenebisacrylamide. Statistical analyses were employed to produce lignin-based hydrogels with the highest yield and swelling capacity. The success of the polymerization reactions was confirmed by NMR and Fourier infrared spectroscopy. The lignin-based hydrogel was more thermally and rheological stable, but exhibited less swelling affinity, than synthetic hydrogel. The rheological studies indicated that the swollen hydrogels were predominantly elastic and exhibited a critical solution temperature that was between 34 and 37 °C. Compared with the synthetic hydrogel, lignin-based hydrogel behaved less elastic as temperature increased. In addition to inducing a green hydrogel, the results confirmed that hardwood lignin-based hydrogel would have different properties than synthetic-based hydrogels, which could be beneficial for some applications.
在本研究中，通过阔叶木硫酸盐木质素、N-异丙基丙烯酰胺和N,N'-亚甲基双丙烯酰胺的自由基聚合反应合成了水凝胶。采用统计分析方法制备了具有最高产率和溶胀能力的木质素基水凝胶。通过核磁共振（NMR）和傅里叶红外光谱证实了聚合反应的成功。与合成水凝胶相比，木质素基水凝胶具有更高的热稳定性和流变稳定性，但溶胀亲和力较低。流变学研究表明，溶胀后的水凝胶主要表现为弹性，其临界溶解温度在34至37°C之间。与合成水凝胶相比，随着温度升高，木质素基水凝胶的弹性表现较弱。除了制备出绿色水凝胶外，结果还证实阔叶木木质素基水凝胶具有与合成基水凝胶不同的性质，这可能对某些应用有益。
