Rapid transesterification of cellulose in a novel DBU-derived ionic liquid: Efficient synthesis of highly substituted cellulose acetate

Reconstruction of Cellulose Intermolecular Interactions from Hydrogen Bonds to Dynamic Covalent Networks Enables a Thermo-processable Cellulosic Plastic with Tunable Strength and Toughness

“…The real-time FT-IR spectra of the solid fraction in the degradation system (Figure S29b) show that with the extension of degradation time, the stretching vibration peaks corresponding to the -CH 2 groups of Priamine (2885 cm –1 ) and the -CHO groups of DAC (1730 cm –1 ) gradually weaken and appear, respectively. Figure S29b also reveals that some characteristic absorption peaks of cellulose molecular chains at 1598 cm –1 , 1460 cm –1 , and 1058 cm –1 significantly weaken after degradation. , In addition, the 1 H NMR spectra in Figure S29c reveal that the signals at 4.38, 3.82, and 3.41 ppm corresponding to H 1 to H 6 of anhydroglucose are detected in the degraded solution. − These results indicate that the degradation mechanism of cellulosic plastics can be ascribed to two aspects. First, the transimination reaction between imine linkages and Priamine broke the dynamic imine cross-linking networks, significantly decreasing the stability and accelerating the degradation of cellulosic plastics.…”

Cellulose acetate-based membrane for wastewater treatment—A state-of-the-art review

“…32 A similar rapid and direct transesterification method has also been reported in the literature. [80][81][82] Highly purified cellulose acetate was produced by controlling the reaction temperature and DS, which does not include any pretreatment. Instead of using bulky chloride of acetyl chloride, a chloroorganic solvent, dichloromethane, can be used as a co-solvent for the homogeneous acetylation of cellulose in the presence of 1-ethyl-3-methylimidazolium acetate (EMIMOAc).…”

“…32 A similar rapid and direct transesterification method has also been reported in the literature. 80–82…”