Rapid Dissolution of Cellulose in LiOH/Urea and NaOH/Urea Aqueous Solutions
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- 13 June 2005
- journal article
- research article
- Published by Wiley in Macromolecular Bioscience
- Vol. 5 (6), 539-548
- https://doi.org/10.1002/mabi.200400222
Abstract
Summary: Rapid dissolution of cellulose in LiOH/urea and NaOH/urea aqueous solutions was studied systematically. The dissolution behavior and solubility of cellulose were evaluated by using 13C NMR, optical microscopy, wide-angle X-ray diffraction (WAXD), FT-IR spectroscopy, DSC, and viscometry. The experiment results revealed that cellulose having viscosity-average molecular weight ( ) of 11.4 × 104 and 37.2 × 104 could be dissolved, respectively, in 7% NaOH/12% urea and 4.2% LiOH/12% urea aqueous solutions pre-cooled to −10 °C within 2 min, whereas all of them could not be dissolved in KOH/urea aqueous solution. The dissolution power of the solvent systems was in the order of LiOH/urea > NaOH/urea ≫ KOH/urea aqueous solution. The results from DSC and 13C NMR indicated that LiOH/urea and NaOH/urea aqueous solutions as non-derivatizing solvents broke the intra- and inter-molecular hydrogen bonding of cellulose and prevented the approach toward each other of the cellulose molecules, leading to the good dispersion of cellulose to form an actual solution. 13C NMR chemical shifts of carbonyl carbon for urea in LiOH (a) and NaOH (b) of the cellulose solutions.Keywords
This publication has 28 references indexed in Scilit:
- Sustainable Bio-Composites from Renewable Resources: Opportunities and Challenges in the Green Materials WorldJournal of Polymers and the Environment, 2002
- Unconventional methods in cellulose functionalizationProgress in Polymer Science, 2001
- A bright future for celluloseProgress in Polymer Science, 1999
- Biopolymers from Renewable ResourcesPublished by Springer Science and Business Media LLC ,1998
- Aqueous Calcium Thiocyanate Solution as a Cellulose Solvent. Structure and Interactions with CellulosePolymer Journal, 1998
- Organic Solvents for Cellulose as a Biodegradable Polymer and Their Applicability for Cellulose Spinning and DerivatizationJournal of Macromolecular Science, Part A, 1993
- Characterization of cellulose–chitosan blend filmsJournal of Applied Polymer Science, 1992
- Dissolution of Natural Cellulose into Aqueous Alkali Solution: Role of Super-Molecular Structure of CellulosePolymer Journal, 1992
- THE LITHIUM CHLORIDE/DIMETHYLACETAMIDE SOLVENT FOR CELLULOSE: A LITERATURE REVIEWJournal of Macromolecular Science, Part C: Polymer Reviews, 1990
- Application of Modern Analytical Techniques to the Investigation of Cellulose NitratesJournal of Macromolecular Science, Part C: Polymer Reviews, 1983