Abstract
The morphology and crystalline structure changes of cellulose during dissolution in 1-butyl-3-methylimidazolium chloride [(BMIM)Cl] were investigated by optical microscopy and synchrotron radiation wide-angle X-ray diffraction (WAXD). Neither swelling nor dissolution of cellulose was observed under the melting point of [BMIM]Cl. While the temperature was elevated to 70 °C, the swelling phenomenon of cellulose happened with the interplanar spacing of (\( 1\bar{1}0 \)) and (020) planes increased slightly. With the temperature further going up to 80 °C, cellulose was dissolved gradually with the crystallinity (W c,x) and crystalline index (CrI) of cellulose decreased rapidly, which indicated the crystalline structure of cellulose was destroyed completely and transformed into amorphous structure.
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Acknowledgments
The work was supported by a grant from National Natural Science Foundation of China (50873025), Shanghai Leading Academic Discipline Project (B603) and the Innovation Funds for PhD Students (Jiang Guansen) of Donghua University, and the Fundamental Research Funds for the Central Universities. WAXD experiments were performed at both U7B Beamline station in the National Synchrotron Radiation Laboratory (NSRL) and the Beamline (BL14B1) in Shanghai Synchrotron Radiation Facility (SSRF).
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Jiang, G., Huang, W., Wang, B. et al. The changes of crystalline structure of cellulose during dissolution in 1-butyl-3-methylimidazolium chloride. Cellulose 19, 679–685 (2012). https://doi.org/10.1007/s10570-012-9689-1
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DOI: https://doi.org/10.1007/s10570-012-9689-1