深共晶溶剂
纤维素
结晶度
琥珀酸酐
化学
热稳定性
氯化锂
聚合
高分子化学
溶剂
尿素
锂(药物)
化学工程
溶解
材料科学
共晶体系
有机化学
聚合物
工程类
内分泌学
医学
合金
结晶学
作者
Tuula Selkälä,Juho Antti Sirviö,Gabriela S. Lorite,Henrikki Liimatainen
出处
期刊:Chemsuschem
[Wiley]
日期:2016-10-14
卷期号:9 (21): 3074-3083
被引量:78
标识
DOI:10.1002/cssc.201600903
摘要
Deep eutectic solvents (DESs) are green chemicals that have the potential to replace traditional solvents in chemical reactions. In this study, urea-LiCl DES was used successfully as a reaction medium in the anionic functionalization of wood cellulose with succinic anhydride. The effects of reaction temperature and time on the carboxyl content and yield were evaluated. The analyses of the degree of polymerization and crystallinity revealed that the DES was a nondegrading and nondissolving reaction medium. Three samples with the highest carboxyl contents were further nanofibrillated with a microfluidizer to diameters of 2-7 nm, as observed by atomic force microscopy. Samples treated at 70-80 °C for 2 h gave the best outcome and resulted in highly viscose and transparent gels. The sample treated at 90 °C contained larger nanoparticles and larger aggregates owing to the occurrence of possible side reactions but resulted in better thermal stability.
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