磷钨酸
溶解
牛皮纸
催化作用
硫酸盐法
牙髓(牙)
纤维素
化学工程
反应性(心理学)
化学
纤维素纤维
纺纱
水解
木质素
材料科学
有机化学
复合材料
高分子化学
病理
替代医学
工程类
医学
作者
Chao Duan,Chaochao Tian,Guodong Tian,Xinqi Wang,Mengxia Shen,Shuo Yang,Yonghao Ni
标识
DOI:10.1016/j.ijbiomac.2022.12.182
摘要
Improving the cellulose accessibility and reactivity in an efficient and convenient way has become the focused issue in the field of dissolving pulp manufacturing. We herein demonstrate a simple yet efficient strategy, namely a simultaneous microwave (MW)-assisted phosphotungstic acid (PTA) catalysis (MW-PTAsim). The MW-PTAsim treatment was efficient to improve Fock reactivity from 49.1 % to 85.8 % and decrease viscosity from 561 to 360 mL/g within 10 min, which was superior to the single MW treatment and the sequential MW-PTAseq treatment. Besides, the MW-PTAsim treated fiber had rougher and more fibrillated surfaces with an enhanced fiber accessibility, showing increased specific surface area (SSA) from 1.43 to 6.31 m2/g, mean pore diameter (MPD) from 6.92 to 11.20 nm and water retention value (WRV) from 101 % to 172 %. These positive enhancements are mainly due to a synergy that MW-enhanced rotation of PTA mediums was served as "spinning cutters" to attack the fibers, plus MW-accelerated PTA transfer and catalytic hydrolysis further improved the fiber accessibility. Moreover, PTA also demonstrates a high reusability and chemical stability. This process offers an effective and sustainable alternative for manufacturing a premium dissolving pulp.
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