title: Facile cellulose dissolution without heating in [C₄mim][CH ₃COO]/DMF solvent.
abstract: Novel cellulose solvents, [C4mim][CH3COO]/DMF, were designed by adding an aprotic polar solvent N,N-dimethylformamide (DMF) in 1-butyl-3-methylimidazolium acetate ([C4mim][CH3COO]). The solubilities of cellulose in [C4mim][CH3COO]/DMF solvents were determined at 25°C. The effects of molar ratio of DMF to [C4mim][CH3COO] on cellulose solubility and the possible dissolution mechanism of cellulose in [C4mim][CH3COO]/DMF solvent have been studied. Moreover, the regenerated cellulose from [C4mim][CH3COO]/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" [CH3COO](-) anions and [C4mim](+) cations which result from the dissociation of [C4mim][CH3COO] by DMF. Moreover, the macromolecular chain of the cellulose is hardly broken during the dissolution and precipitation processes.
authors: School of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology Luoyang, Henan 471003, PR China. Electronic address: airongxu@haust.edu.cn.
authors: Airong
authors: A
authors: Xu
authors: School of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology Luoyang, Henan 471003, PR China.
authors: Lili
authors: L
authors: Cao
authors: China Iron & Steel Research Institute Group, Beijing 100081, PR China.
authors: Bingjun
authors: B
authors: Wang
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D004126:Dimethylformamide / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D012997:Solvents / Q000737:chemistry*
chemical_list: C525963:1-butyl-3-methylimidazolium; D007093:Imidazoles; D012996:Solutions; D012997:Solvents; D004126:Dimethylformamide; D002482:Cellulose
keywords: Cellulose; Dissolution mechanism; Regenerated cellulose; [C(4)mim][CH(3)COO]/DMF solvent