Journal
CARBOHYDRATE RESEARCH
Volume 342, Issue 7, Pages 919-926Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2007.02.006
Keywords
cellulose; ionic liquid; succinic anhydride sugarcane bagasse; crystallinity
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The homogeneous chemical modification of sugarcane bagasse cellulose with succinic anhydride using 1-allyl-3-methylimidazolium chloride (AmimCl) ionic liquid as a reaction medium was studied. Parameters investigated included the molar ratio of succinic anhydride/anhydroglucose units in cellulose in a range from 2:1 to 14: 1, reaction time (from 30 to 160 min), and reaction temperature (between 60 and 110 degrees C). The succinylated cellulosic derivatives were prepared with a low degree of substitution (DS) ranging from 0.071 to 0.22. The results showed that the increase of reaction temperature, molar ratio of SA/AGIJ in cellulose, and reaction time led to an increase in DS of cellulose samples. The products were characterized by FT-IR and solid-state CP/MAS C-13 NMR spectroscopy, and thermal analysis. It was found that the crystallinity of the cellulose was completely disrupted in the ionic liquid system under the conditions given. The data also demonstrated that homogeneous modification of cellulose with succinic anhydride in AmimCl resulted in the production of cellulosic monoester. The thermal stability of the succinylated cellulose decreased upon chemical modification. (c) 2007 Elsevier Ltd. All rights reserved.
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