期刊
POLYMER CHEMISTRY
卷 1, 期 10, 页码 1662-1668出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0py00163e
关键词
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资金
- National Basic Research Program of China (973 Program) [2010CB732203]
- National Natural Science Foundation of China [50973085]
- Fundamental Research Funds for the Central Universities [2081005]
- Engineering Research Center for Biomass Modified Materials, Sichuan Province, China
A series of cyanoethyl cellulose (CEC) samples were synthesized from cellulose in NaOH/urea aqueous solutions by a homogeneous method. Structure and properties of CECs were characterized with FT-IR, H-1 and C-13 NMR, DSC, SEC-LLS, polarized light microscopy and solubility measurements. The total DS values of the obtained CECs were in the range of 0.26 to 1.93, and the relative reactivity of hydroxyl groups is in the order C-6 > C-2 > C-3. As the molar ratio of acrylonitrile to anhydroglucose unit (AGU) of cellulose increased to 5 : 1, the C-6 hydroxyl groups of AGU were fully substituted. The total DS value for water-soluble CEC is as low as 0.54. CEC could be dissolved in many organic solvents when its total DS value reached 1.37. Organic-soluble CEC samples displayed thermotropic liquid crystalline behavior in the temperature range of 180 to 280 degrees C. Moreover, NaOH/urea aqueous solution was proved to be a stable medium for cyanoethylation of cellulose, the reaction products could be easy isolated and purified, and the solvents could be recycled by a simple filtration. Therefore, this work provides a facile method for the homogeneous synthesis of CEC in an aqueous system.
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