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Title
Ultrasound-assisted modification of beet pulp cellulose with phthalic anhydride in ionic liquid
Authors
S. MA Q. TIAN Z. H. WANG and X. L. ZHENG
Received
August 4, 2012
Published
Volume 47 Issue 7-8 July-August
Keywords
ultrasound-assisted, cellulose, beet pulp, phthalation, ionic liquid (IL)
Abstract
Cellulose phthalates were synthesized from beet pulp cellulose and phthalic anhydride in ionic liquid (IL)
1-butyl-3-methylimidazolium chloride assisted by ultrasound. The parameters investigated included ultrasound time
(from 15 to 60 min), temperature (between 95 and 120 °C), the molar ratio of phthalic anhydride/anhydroglucose units
in cellulose (from 2:1 to 6:1), and reaction time (from 30 to 70 min). The results showed that the synergy of the
combined use of ultrasound and IL successfully enhanced the degree of substitution of cellulose phthalates under the
experimental conditions of the present study. After the chemical modification, the results of FT-IR and solid-state
CP/MAS 13C NMR showed the appearance of hydroxyl groups and reduction of OH bonds on the cellulose. The TGA
data indicated that the cellulose phthalate showed lower thermal stability than native cellulose.
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