期刊
CARBOHYDRATE POLYMERS
卷 101, 期 -, 页码 947-953出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.09.068
关键词
Bacterial cellulose; Sulfation; SO3/Py; Characterization
资金
- National Science Foundation of China [21264007]
- Key Scientific and Technological project of Haikou city [2010-084]
- Special Project of Hainan Social Development [2012SF019]
- Foundation of Hainan University for young scientist [qnjj1221]
Various sodium bacterial cellulose sulfates (SBCS) were prepared via the homogeneous sulfation of bacterial cellulose (BC) with a SO3/pyridine (Py) complex in a dimethyl acetamide/lithium chloride solution. The SBCSs were characterized using Fourier transform infrared spectroscopy, X-ray diffraction (XRD), carbon nuclear magnetic resonance spectroscopy, gel permeation chromatography, elemental analyses, and thermal gravimetric analyses. A variety of conditions (including various amounts of SO3/Py, temperatures, and reaction times) were utilized to obtain SBCSs with DS values that ranged from 0.10 to 1.50. The XRD profiles indicated that the SBCSs had a cellulose II analog polymorphous structure. The differences between BC and microcrystalline cellulose (MC) were studied in their respective reactions. BC is more reactive than MC in both the sulfation and depolymerization processes. The order of reactivity for C OH is C6 > C2 > C3 for both BC and MC. Cellulose sulfates with DS values >0.31 were soluble in deionized water. (C) 2013 Elsevier Ltd. All rights reserved.
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