Abstract
Developing sustainable, low viscous and efficient solvents are always advantageous to the processing/fabricating of cellulose materials in practical applications. To this end, in this work novel solvents were developed; ([Amim][CH3COO]/PEG) by dissolving polyethylene glycol 200 (PEG-200) in 1-allyl-3-methylimidazolium acetate ([Amim][CH3COO]). The solubilities of cellulose in [Amim][CH3COO]/PEG solvents were determined as a function of temperature, and the possible dissolution mechanism of cellulose in [Amim][CH3COO]/PEG solvent was investigated. The novel solvent exhibits outstanding advantages for good dissolution capacity of cellulose, such as low viscosity, negligible vapor pressure, and recycling capability. The [CH3COO]− anion and the [Amim]+ cation of [Amim][CH3COO] in [Amim][CH3COO]/PEG-10 are the driving force for cellulose dissolution verified by the 13C NMR spectra. In addition, the regenerated cellulose films from [Amim][CH3COO]/PEG solvent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and thermogravimetric analysis (TGA) to estimate their morphologies and structures.
Highlights
With the increasing depletion of petroleum resources, the exploitation of low-cost biorenewables, bioresource has received great attention [1,2]
The regenerated cellulose films from [Amim][CH3 COO]/Polyethylene glycol (PEG) solvent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and thermogravimetric analysis (TGA)
The solution was cast onto a glass plate to give a thickness of about 2 mm, the air bubbles removed in a vacuum oven for 30 min, and immediately coagulated in water to obtain a transparent regenerated cellulose gel film
Summary
With the increasing depletion of petroleum resources, the exploitation of low-cost biorenewables, bioresource has received great attention [1,2]. Some efforts have been made to develop more efficient cellulose solvent systems by adding co-solvents to ILs. For example, Rinaldi developed solvent systems Sun et al developed tetrabutylammonium acetate/dimethyl sulfoxide (TBAA/DMSO) solvent which could dissolve cellulose and spin cellulose fibers by a wet spinning system [17]. Rein et al investigated the structure of cellulose in 1-ethyl-3-methylimidazolium acetate [Emim][CH3 COO] + DMSO/DMF solvent and found that cellulose was dissolved molecularly in the solvents [18]. It has been reported that 1-allyl-3-methylimidazolium acetate [Amim][CH3 COO] displays powerful dissolution capacity for cellulose even at ambient temperature [8]. 13 C NMR technique was employed to investigate the possible dissolution mechanism of cellulose in [Amim][CH3 COO]/PEG solvent. The regenerated cellulose films from [Amim][CH3 COO]/PEG solvent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and thermogravimetric analysis (TGA)
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