Journal
CARBOHYDRATE POLYMERS
Volume 87, Issue 2, Pages 1058-1064Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.08.026
Keywords
1-Allyl-3-alkylimidazolium chloride ionic liquids; Carbon atom; Cellulose dissolution; Regenerated cellulose
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Funding
- National Natural Science Foundation of China [31000285]
- South China University of Technology, PR China [2009ZM0106]
- Pulp & Paper Engineering State Key Laboratory, South China University of Technology, PR China [200914]
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In this work, the 1-allyl-3-alkylimidazolium chloride ionic liquids were synthesized and characterized by increasing carbon atoms (n <= 6) of alkyl chains on a cationic 3-imidazole ring. The results indicated that 1-allyl-3-alkylimidazolium chloride with asymmetrical structure on the two sides of a cationic 3-imidazole ring (i.e., n=1, 2, 6) exhibited alkalinity and lower thermal stabilities, and showed better solubility to the cellulose samples at 60-120 degrees C than those with symmetrical structures (n = 3, 4). The cellulose samples treated by 20% (w/w) ethylenediamine solution showed better solubility in 1-allyl-3-ethyl, hexyl-imidazolium chloride ionic liquids than that treated with 20% (w/w) NaOH solution at 5 degrees C for 72 h. XRD and TG analysis indicated that 002 plane apparent crystallite size as well as thermal stability of the regenerated cellulose samples from the ionic liquids decreased significantly compared with the untreated cellulose samples. (C) 2011 Elsevier Ltd. All rights reserved.
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