结晶
纤维素
结晶度
化学工程
纤维
材料科学
热稳定性
无定形固体
离子液体
高分子化学
纤维素纤维
化学
复合材料
有机化学
工程类
催化作用
作者
Huailing Diao,Guangjie Song,Jin Wu,Xuejing Zheng,Jun Zhang
出处
期刊:Biomacromolecules
[American Chemical Society]
日期:2022-03-24
卷期号:23 (6): 2264-2271
被引量:6
标识
DOI:10.1021/acs.biomac.1c01553
摘要
With the emergence of efficient green solvents, structural regulation of regenerated cellulose is highly desired in the solution process from an industrial perspective. Cellulose fiber and films are viewed as a "composite" comprising amorphous and crystalline fractions. The regulation of the crystalline structure is of great importance for the properties of cellulose materials. In this study, we found stretch-induced crystallization behavior during the transition from solution to gel via coagulation. The crystallinity index of the hydrogel fiber increases with the stretch ratio (SR). X-ray diffraction revealed that the cellulose II hydrate formed in the stretched hydrogel fibers. The mechanical properties and thermal stability of the dry fibers greatly improved against the SR. This crystallization behavior depends on the concentration of the solution and the type of ionic liquid. This stretch-induced crystallization provides an efficient method for structural regulation in cellulose solution processing.
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