Facile cellulose dissolution without heating in [C4mim][CH3COO]/DMF solvent. (10th July 2015)

• Record Type: Journal Article
• Authors: Xu, Airong; Cao, Lili; Wang, Bingjun
• Is Part Of: Carbohydrate polymers. Volume 125(2015)
• Page Start: 249
• Page End: 254
• Publication Date: 2015-07-10
• Subjects: Cellulose -- [C4mim][CH3COO]/DMF solvent -- Dissolution mechanism -- Regenerated cellulose; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2015.02.045
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Developed effective solvents by adding DMF into [C4 mim][CH3 COO]. The solvents can readily dissolve cellulose at room temperatures. Prompted cellulose dissolution results from the dissociation of [C4 mim][CH3 COO]. Macromolecular chain of regenerated cellulose is hardly broken. Abstract: Novel cellulose solvents, [C4 mim][CH3 COO]/DMF, were designed by adding an aprotic polar solvent N, N -dimethylformamide (DMF) in 1-butyl-3-methylimidazolium acetate ([C4 mim][CH3 COO]). The solubilities of cellulose in [C4 mim][CH3 COO]/DMF solvents were determined at 25 °C. The effects of molar ratio of DMF to [C4 mim][CH3 COO] on cellulose solubility and the possible dissolution mechanism of cellulose in [C4 mim][CH3 COO]/DMF solvent have been studied. Moreover, the regenerated cellulose from [C4 mim][CH3 COO]/DMF solvent were characterized by scanning electron micrograph (SEM) Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), and the degree of polymerization (DP) of regenerated cellulose was determined. The findings reveal that the facile dissolution of cellulose in such solvents is mainly attributed to the increased "free" [CH3 COO] − anions and [C4 mim] + cations which result from the dissociation of [C4 mim][CH3 COO] by DMF. Moreover, the macromolecular chain of the cellulose is hardly broken during the dissolution and precipitation processes.