Abstract: In view of environmental pollution and the non-renewable problem of petroleum resources, it is of great significance to develop renewable resources that are environmentally friendly and widely available for modification.The present study, one of the most abundant biomass resources, cellulose, was dissolved and activated in the DBU/DMSO/CO2 reversible ionic liquid dissolution system, and then was chemically modified by 2,3-pyridine dicarboxylic anhydride to synthesize pyridine cationic cellulose polyionic liquid. The impact of reaction temperature, molar ratio and reaction time on the degree of substitution was studied. As can be seen from the results, the product achieved the highest substitution degree of 2.18, under the molar ratio of 2,3-pyridine dicarboxylic anhydride to cellulose anhydroglucose unit (AGU) of 1.2∶1, the reaction temperature of 80 ℃, and the reaction time of 4 h. Fourier transform infrared spectroscope (FTIR) and nuclear magnetic resonance (NMR) were employed to characterize the structure of cellulose polyionic liquid. In addition, the synchronous thermal analyzer was adopted to measure the thermal properties of the cellulose polyionic liquid, and its initial decomposition temperature of 152 ℃ was obtained. The proposed approach for preparing cellulose polyionic liquid exhibited simple operation process, no environmental pollution and by-products generally, showing certain guiding significance for the development of new cellulose derivatives.
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2019, Vol. 33 
