微波法制备纤维素长链酰基酯及表征

Esterification of cellulose with long-chain fatty acid under microwave irradiation ant its characterization

纤维素和高级脂肪酸在均相条件下借助微波辐射合成了纤维素长链脂肪酸酯。当对纤维素/月桂酸/甲苯磺酰氯反应体系进行微波辐照,反应时间从传统加热(80℃)下的24 h下降至90 s,而其产物的取代度最大为2.56,研究了原料配比、微波时间等对产物取代度(DS)、质量收率和摩尔收率的影响以及DS与产物溶解性的关系,并对产物的结构进行了表征。结果表明脂肪酸酯基接枝在了纤维素骨架上,由此制备的纤维素薄膜材料具有一定的机械性能。

The esterification of cellulose with long chain carboxylic acid in a homogeneous phase by microwave irradiation is presented.The esterification reaction system includes cellulose,fatty acid and DMAc/LiCl with p-toluenesulfonyl chloride(Ts-Cl) as an activating reagent.It is found that the microwave irradiation can result in a dramatic drop in reaction time,from 20 hours of conventional heating at 80℃ to 90 s,and the maximal degrees of substitution(DS) can reach 2.56.The DS value,molar yields of fatty acid,Ts...