Synthesis of cellulose acetate propionate and cellulose acetate butyrate in a CO2/DBU/DMSO system
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The reversible reaction of the hydroxyl groups in cellulose with CO2 in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) results in a rapid and effective derivative dissolution of cellulose in DMSO, by which a series of cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB) with various degrees of substitution (DS) were synthesized controllably without adding external catalysts. Wherein DBU not only achieves the dissolution of cellulose, but also acts as an efficient organocatalyst for the subsequent cellulose derivatization. The DS of CAB and CAP can be tuned by changing the feed molar ratio of propionic (butyric) anhydride/acetic anhydride and the reaction temperature. The structural and thermal properties of the products were characterized by several analytical techniques including NMR, FT-IR, and TGA. The CO2/DBU/DMSO dissolution system provides a new platform for controllable synthesis of mixed cellulose esters with high efficiency under mild conditions.
KeywordsCellulose dissolution Cellulose mixed esters Controllable synthesis Organocatalysis
Cellulose acetate propionate
Cellulose acetate butyrate
Degrees of substitution
Thermo gravimetric analysis
Differential scanning calorimetry
Fourier transform infrared spectrometer
This work was financially supported by the National Natural Science Foundation of China (Grant No. 31270637 and 21574030); Science and Technology Department of Guizhou Province (Grant No. Natural Science Key Fund 1402) (Grant No. Platform and Talents 5652); Open research fund of Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education of China (08031339); Foundation of State Key Laboratory of Coal Conversion (Grant No. J17-18-907); Excellent Scientific Innovative Talent Programme from Education Department of Guizhou Province (Grant No. KY479).
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