基于 RAFT 和芳香席夫碱化学的乙基纤维素基自修复胶粘剂的合成。
Ethyl cellulose based self-healing adhesives synthesized via RAFT and aromatic schiff-base chemistry.
机构信息
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Laboratory for Biomass Chemical Utilization, Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, 210042, Jiangsu, China; College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, Jiangsu, China.
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Laboratory for Biomass Chemical Utilization, Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, 210042, Jiangsu, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, Jiangsu, China.
出版信息
Carbohydr Polym. 2020 Dec 15;250:116846. doi: 10.1016/j.carbpol.2020.116846. Epub 2020 Aug 13.
In this work, reversible addition-fragmentation chain transfer (RAFT) polymerization and Schiff base chemistry was combined to fabricate self-healing adhesives. An esterification reaction was first performed to prepare ethyl cellulose based macroinitiators. Then, a "grafting from" RAFT of vanillin methacrylate and lauryl methacrylate was used to obtain graft copolymers. DSC result showed that the glass transition temperature was manipulated via changing the ratio of vanillin and fatty acids moieties. NMR spectrum analysis demonstrated the presence of aldehyde groups, which were available for the dynamic crosslinking to generate a network as self-healing adhesives. The adhesive test showed that the shear strength could reach 0.81 MPa with a self-healing efficiency of 98.7 %. The bottlebrush structures of copolymers and reversibility of Schiff base chemistry might collaboratively contribute to the high self-healing efficiency. This study provides a facile way to fabricate high-performance self-healing adhesives from ethyl cellulose and renewable resources.
在这项工作中，可逆加成-断裂链转移（RAFT）聚合和席夫碱化学被结合起来制备自修复胶粘剂。首先进行酯化反应，制备乙基纤维素基大分子引发剂。然后，通过“从接枝”甲基丙烯醛和甲基丙烯酸月桂酯的 RAFT 聚合，得到接枝共聚物。DSC 结果表明，通过改变香草醛和脂肪酸部分的比例来控制玻璃化转变温度。NMR 光谱分析表明存在醛基，可用于动态交联生成网络作为自修复胶粘剂。胶粘剂测试表明，剪切强度可达 0.81MPa，自修复效率为 98.7%。共聚物的瓶刷结构和席夫碱化学的可逆性可能共同有助于实现高自修复效率。本研究为从乙基纤维素和可再生资源制备高性能自修复胶粘剂提供了一种简便的方法。
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