纤维素-碱木质素水凝胶的制备及其性能表征  

Preparation and Characterization of Cellulose-Alkali Lignin Hydrogel

作　　者：赵鑫[1] 曹光辉 刘肖月 李琪微 于露露 孙晨 胡英成[1] ZHAO Xin;CAO Guanghui;LIU Xiaoyue;LI Qiwei;YU Lulu;SUN Chen;HU Yingcheng(Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室

出　　处：《武汉工程大学学报》2019年第4期366-370,共5页Journal of Wuhan Institute of Technology

基　　金：东北林业大学大学生院级创新训练项目(CL201715)

摘　　要：在氢氧化钠和尿素水溶液的均匀混合环境中,加入交联剂环氧氯丙烷,采用加热法分别成功制备出纤维素(CL)水凝胶、纤维素-碱木质素(CAL)水凝胶及纤维素-离子液体木质素(CIL)水凝胶。分别采用溶胀度及再溶胀度测试、热重分析对3种水凝胶在3种溶液中的溶胀能力、热稳定性进行评价。实验结果表明,木质素的添加有利于CL水凝胶在蒸馏水溶液中的溶胀度,CIL木质素水凝胶在3种水凝胶中的再溶胀能力最高。与CL水凝胶相比,CAL水凝胶热分解范围较窄且分解速度缓慢,CAL在600℃高温炭化后固体残留量由32.6%提高到38.8%,CIL在600℃高温炭化后固体残留量由32.6%提高到35.7%,木质素的加入对CL水凝胶的热稳定性有一定的提高,CAL水凝胶具有良好的热力学稳定性。添加木质素制备CAL水凝胶,对于提高CL水凝胶热稳定性、实现生物质多组分高值化利用具有重要意义。Cellulose(CL)hydrogel,cellulose-alkali lignin(CAL)hydrogel and cellulose-ionic liquid lignin(CIL)hydrogel were successfully prepared by heating with epichlorohydrin as the crosslinking agent in the aqueous solution of sodium hydroxide and urea. The swelling capacity and thermal stability of three hydrogels in three solutions were evaluated by swelling/re-swelling test and thermogravimetric analysis. The results show that the addition of lignin is beneficial to the improvement of swelling degree of cellulose hydrogels in distilled water,and the re-swelling ability of CIL is the highest among the three hydrogels. Compared with CL,CIL shows narrower range of thermal decomposition,and slower decomposition rate. The solid residues of CAL and CIL increase from 32.6% to 38.8% and from 32.6% to 35.7% respectively after the carbonization at 600 ℃. The addition of lignin improves the thermal stability of CL,and CIL possesses good thermodynamic stability. Adding lignin into the basic cellulose solution is of great significance for improving the thermal stability of cellulose hydrogel and realizing high value-added utilization of multi-component biomass.

关 键 词：纤维素 木质素 水凝胶 溶胀度 

分 类 号：TQ35[化学工程]