Abstract
The dissolution of cellulose in tetrabutylammonium acetate (TBAA) and dimethyl sulfoxide (DMSO) mixed solvent was studied at room temperature (approximately 25 °C). The ratio of TBAA in the mixed solvent system (WTBAA) was found to have great influence on the solubility of cellulose and the corresponding dissolution time. The mixed solvent of WTBAA = 0.15 possessed the highest cellulose solubility and shortest dissolution time. Various cellulosic materials were well-dissolved in the solvent with a maximum solubility up to 8.17 wt %. A mechanistic study regarding the interaction between the solvent system and the model compound cellobiose was conducted using 1H NMR, 13C NMR, ATR-FTIR, conductivity, and viscosity measurements. The results implied that TBAA existed at two different states in the mixed solvent as the ratio of TBAA varied (i.e., ion-split stage (WTBAA ≤ 0.15) and ion-paired stage (WTBAA ≥ 0.15)). WTBAA = 0.15 was the turning point of these two stages, and the mixed solvent displayed the best d...
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