纤维素
结晶
化学工程
收缩率
纤维素纤维
无定形固体
材料科学
尿素
化学
复合材料
有机化学
工程类
作者
Hongkang Fu,Wenxuan Mo,YU Ming-hui,Bo Li,Kefu Chen
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2023-02-22
卷期号:11 (9): 3841-3849
被引量:5
标识
DOI:10.1021/acssuschemeng.2c07049
摘要
The large-scale and multilevel application of renewable cellulose resources is one of important strategies for the sustainable development of human society. However, thermal drying is usually an inevitable procedure during utilization of cellulose fibers and it leads to hornification of cellulose fibers, which seriously hinders their further development. A typical feature of hornification is the irreversible shrinkage of cellulose fibers, including shrinkage of the cell lumen, cell wall, and pores on it. These macroscopic structural changes originate from the recrystallization of cellulose molecules caused by forced dehydration during processing. Here, an easy NaOH-urea treatment method to reverse the hornification of hornified cellulose fibers (HCFs) was proposed. The cell lumen, cell wall, and pores of HCFs were restored, and the hydroxyl groups were released inside and on the surface of the fibers; the water retention value (WRV) was relatively increased by 41.8%, and the hornification was reversed by 79%. The drying-induced crystallization and cocrystallization of amorphous cellulose were disrupted, which proved that NaOH-urea treatment can realize a procedural hornification reversal. Finally, the promotion of NaOH-urea treatment on the application of HCFs was verified and explained. This paper will make an important contribution to the reversible characteristic regulation, multiple utilization, efficient recycling, and reuse of cellulose materials.
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