title: Understanding the dissolution of cellulose in 1-butyl-3-methylimidazolium acetate+DMAc solvent.
abstract: Cellulose solvent ([C4mim][CH3COO]/DMAc) could be obtained by adding N,N-dimethylacetamide (DMAc) in 1-butyl-3-methylimidazolium acetate ([C4mim][CH3COO]). The solubilities of cellulose in [C4mim][CH3COO]/DMAc solvents were determined at 25°C. The effects of molar ratio of DMAc to [C4mim][CH3COO] on cellulose solubility and the possible dissolution mechanism of cellulose in [C4mim][CH3COO]/DMAc solvent have been studied. Moreover, the regenerated cellulose from [C4mim][CH3COO]/DMAc solvent were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). It was found that, cellulose was more readily dissolved in [C4mim][CH3COO]/DMAc solvent than in a neat [C4mim][CH3COO], which mainly attributed to the increased "free" [CH3COO](-) anions and [C4mim](+) cations which result from the dissociation of [C4mim][CH3COO] by DMAc. Moreover, the regenerated cellulose from [C4mim][CH3COO]/DMAc solvent displayed good thermostability and similar molecular structure to the original cellulose.
authors.affiliation: School of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, PR China. Electronic address: airongxu@haust.edu.cn.
authors.forename: Airong
authors.initials: A
authors.lastname: Xu
authors.affiliation: School of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Guo
authors.affiliation: School of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, PR China.
authors.forename: Rui
authors.initials: R
authors.lastname: Xu
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D012995:Solubility; D012997:Solvents / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: C525963:1-butyl-3-methylimidazolium; D000081:Acetamides; D007093:Imidazoles; D012997:Solvents; D002482:Cellulose; C013959:dimethylacetamide
keywords: Cellulose; Dissolution mechanism; Regenerated cellulose; [C(4)mim][CH(3)COO]/DMAc solvent