The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China; School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, North Ren Min Road 2999, Shanghai 201620, China.
Carbohydr Polym. 2022 Nov 15;296:119917. doi: 10.1016/j.carbpol.2022.119917. Epub 2022 Jul 28.
Low-temperature two-step concentrated HSO was discovered to be a solvent with high cellulose solubility [>300 g/L (17 wt%)], fast cellulose dissolution, high regeneration yield (>0.92 g/g), and cellulose being mouldable during regeneration. The superior performance was enabled by the much better compatibility of cellulose with lower concentrated HSO at low temperature, compared with that of high concentrated HSO. The regenerated cellulose was characterized by mostly unchanged composition and highly tunable degree of polymerization (DP). The HSO starting content, cotton fibre temperature, dissolution temperature, regeneration temperature, regeneration bath and storage time were factors determining the DP of regenerated cellulose, which could be equivalent to 4-90 % of the original cotton. These advantages of the solvent enabled versatile application in fabrication of extra strong cellulose hydrogels, manufacture of strong cellulose fibres, preparation of various homogenous composites which would be prepared with much more difficulty by using other solvents, and facile manufacture of cellooligosaccharides.
低温两步浓缩 HSO 被发现是一种具有高纤维素溶解度（>300g/L（17wt%））、纤维素溶解快速、再生产率高（>0.92g/g）且纤维素在再生过程中可成型的溶剂。与高浓度 HSO 相比，低温下纤维素与较低浓度 HSO 具有更好的相容性，从而实现了更优异的性能。再生纤维素的特点是组成基本不变，聚合度（DP）高度可调。HSO 的起始含量、棉纤维温度、溶解温度、再生温度、再生浴和储存时间是决定再生纤维素 DP 的因素，其 DP 可相当于原棉的 4-90%。该溶剂具有这些优势，可广泛应用于制备超强纤维素水凝胶、制造高强度纤维素纤维、制备各种均质复合材料（使用其他溶剂制备这些复合材料会更加困难）以及制备纤维寡糖。
