期刊
CARBOHYDRATE POLYMERS
卷 153, 期 -, 页码 284-291出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.07.092
关键词
Cellulose; Ionic liquids; 1-Butyl-3-methylimidazolium hydrogen sulfate; Hydrolysis kinetics; Swelling
资金
- Elisabeth and Barbara Grammel foundation at the University of Freiburg
- CAPES Foundation
- Ministry of Education of Brazil
1-Butyl-3-methylimidazolium hydrogen sulfate ([Bmim]HSO4) is efficient at extracting cellulose nanocrystals from pulp fibers. To shed some light on the respective contributions of swelling and hydrolysis of pulp fibers by [Bmim]HSO4, the physical, structural and morphological characteristics of hardwood Kraft pulp fibers were monitored under various conditions of temperature, water content and time. Swelling was largely compounded by hydrolysis at the highest temperatures (120 degrees C) as evidenced by mass loss and reduced degree of polymerization (DPn) at this temperature. At 120 degrees C only, water content appeared to play a significant role on the extent of hydrolysis. At this temperature, a heterogeneous kinetic model involving weak links and amorphous regions best described the experimental data. Hydrolysis rates were maximum at 25% water content in the aqueous ionic liquid. (C) 2016 Elsevier Ltd. All rights reserved.
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