Abstract
A facile cellulose solvent 1,3-diallyl-2-ethylimidazolium acetate ([AAeim][OAc]) with high electrical conductivity has been designed and synthesized for the first time, via a quaternization reaction and ion exchange method. The dissolution characteristics of cellulose in this solvent were studied in detail. Meanwhile, the co-solvent system was designed by adding an aprotic polar solvent dimethyl sulfoxide (DMSO) in [AAeim][OAc]. The effects of temperature and the mass ratio of DMSO to [AAeim][OAc] on the solubility of cellulose were studied. Furthermore, the effects of regeneration on the molecular structure and thermal stability of cellulose were determined by Fourier transform infrared spectroscopy (FT-IR), thermal gravity analysis (TGA) and X-ray diffraction (XRD). The findings revealed that the synthesized ionic liquid (IL) has a relatively low viscosity, high conductivity and a good dissolving capacity for bamboo dissolving pulp cellulose (Degree of Polymerization: DP = 650). The macromolecular chain of the cellulose is less damaged during the dissolution and regeneration process. Due to the increased number of “free” anions [OAc]− and cations [AAeim]+, the addition of DMSO can significantly increase the solubility of the cellulose up to 12 wt % at the mass ratio of 3:1, indicating that the synthesized IL has a potential application in the electrospinning field.
Highlights
During the last decades, ionic liquids (ILs) have received global attention because of their unique properties including high chemical and thermal stability, low vapor pressure and excellent structure designability [1,2,3]
The Fourier transform infrared spectroscopy (FT-IR) spectra of the synthesized 1,3-diallyl-2-ethylimidazolium acetate and 1,3-diallyl-2ethylimidazolium chloride can be seen in Supplementary Materials Figure S2
The structure of the synthesized 1,3-diallyl-2-ethylimidazolium acetate was confirmed by 1 H Nuclear Magnetic Resonance (H-NMR)
Summary
Ionic liquids (ILs) have received global attention because of their unique properties including high chemical and thermal stability, low vapor pressure and excellent structure designability [1,2,3]. These distinguished advantages have endowed ILs with versatile applications in areas such as biomass transformation [4,5,6], separation and purification [7,8], electrochemistry [9,10], nanomaterials preparation [11,12] and so on. The effects of regeneration on the molecular structure and thermal stability of cellulose were studied by Fourier transform infrared spectroscopy (FT-IR), thermal gravity analysis (TGA) and X-ray diffraction (XRD)
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