期刊
CARBOHYDRATE POLYMERS
卷 86, 期 2, 页码 672-677出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.05.013
关键词
Cellulose; Ultrasound irradiation; Dissolution; Ionic liquid
资金
- National Natural Science Foundation of China [30871994, 30972325, 30710103906]
- Guangdong Natural Science Foundation [8451064101000409]
- Specialized Research Fund for the Doctoral Program of Higher Education [20070561040]
- Chinese Universities Scientific Fund [2009ZZ0024]
- National Basic Research Program of China [2010CB732201]
Ultrasound-assisted dissolution of cellulose was performed in ionic liquid 1-butyl-3-methylimidazolium chloride ([C(4)mim]Cl). The dissolution process was monitored with polarizing microscope. The effects of parameters including ultrasonic power and irradiation time on cellulose dissolution time were investigated. The dissolution time required for complete dissolution decreased from 190 min without assistance to 60 min irradiated with 30 W ultrasound for 20 min. The regenerated cellulose samples were characterized with FT-IR, solid-state CP/MAS C-13 NMR, wide-angle X-ray diffraction and thermal analysis. The results showed that most crystalline structure of cellulose was destroyed to amorphous structure, and the remained crystalline structure of cellulose was converted to cellulose II from cellulose I in native cellulose. After dissolution and regeneration in ionic liquid, the thermal stability of cellulose decreased and the pyrolysis residues increased. (C) 2011 Elsevier Ltd. All rights reserved.
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