氯化胆碱
醋酸酐
化学
甲壳素
深共晶溶剂
醋酸
产量(工程)
有机化学
热稳定性
水解
乙酰氯
溶剂
氯化物
核化学
催化作用
高分子化学
共晶体系
壳聚糖
材料科学
合金
冶金
作者
Juho Antti Sirviö,Yuan Yang,Qiuru Yang,Chen Ling,Junqian Deng,Weimin Chen,Hailan Lian,Josué D. Mota‐Morales,Henrikki Liimatainen
标识
DOI:10.1016/j.carbpol.2019.05.075
摘要
An efficient and one step production of acetylated and esterified chitin nanocrystals (CNCs) was successfully achieved using choline chloride-zinc chloride deep-eutectic solvent (ChCl-ZnCl2 DES). In this method, ChCl-ZnCl2 DES with a mole ratio of 1:2, was used for the esterification and O-acetylation of chitin at 90 °C for 3 h and 6 h. This strategy consisted in using ChCl-ZnCl2 DES as a green and non-volatile solvent for chitin under heterogeneous condition that, upon addition of acetic anhydride or acetic acid, simultaneous acetylation or esterification and hydrolysis occurred. The DES act as an efficient catalysis of the functional reaction. The acetylation and hydrolysis proceeded efficiently and the yield of partial acetylated CNCs was ca. 61.6% with DS (degree of substitution) of 0.23 under the optimized conditions. Acetic acid was used to substituted acid anhydride to produce CNCs. The yield of acetic acid induced CNCs was ca. 62.0% with higher DS of 0.34. A thorough investigation of the physicochemical characteristics changes of chitin pointed out that the main skeletal structure of obtained CNCs was intact. The thermal stability of CNCs decreased after treated by ChCl/ZnCl2. In addition, thermal stability of CNCs functionalized with acetic acid is lower than the ones functionalized with acetic anhydride. DES showed low expenditure and toxicity. This approach provides a novel method for production of functional chitin nanocrystals.
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