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Abstract In order to study the pre-treatment and application effect of modified cellulose, two low eutectic solvents, choline chloride/urea and choline chloride/glycerol, were synthesized by mixed heating method. Their structures and compositions were determined by infrared spectroscopy. It was found that the solubility of cellulose was higher in low eutectic solvent of choline chloride/urea system with molar ratio of 1∶2. A stable W/O emulsion was prepared by using liquid paraffin as continuous phase and cellulose dissolved in low eutectic solvent as dispersing phase. The volume ratio of continuous phase to dispersed phase was 1∶2, the amount of emulsifier Span80 was 10% of oil phase, and the high efficiency homogenization was used to obtain long-lasting and stable emulsion. The structure, surface morphology and thermal stability of cellulose emulsion treated by low eutectic solvent and cellulose modified by citric acid were analyzed by scanning electron microscopy, infrared spectroscopy and thermogravimetry. It was found that the treatment of cellulose by low eutectic solvent destroyed the hydrogen bond in cellulose to a certain extent, reduced the crystallinity of cellulose, and made its surface rough. The cellulose modified by citric acid presented chaotic and complex appearance. Heterogeneous stacking indicates that there is a strong interaction between carboxylic acid and cellulose. Thermal performance analysis showed that the thermal stability of cellulose treated with low eutectic solvent and cellulose modified with citric acid was better than that of cellulose raw materials.
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Received: 28 September 2020
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2020, Vol. 33 
