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Dissolution and regeneration behavior of chitosan in 3-methyl-1-(ethylacetyl)imidazolium chloride
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Xu, Bin, Li, Qiaoping, Zhuang, Linghua, Wang, Qiang, Li, Chao, Wang, Guowei, Xie, Fengwei and Halley, Peter J. (2016) Dissolution and regeneration behavior of chitosan in 3-methyl-1-(ethylacetyl)imidazolium chloride. Fibers and Polymers, 17 (11). pp. 1741-1748. doi:10.1007/s12221-016-6747-6 ISSN 1229-9197.
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Official URL: http://dx.doi.org/10.1007/s12221-016-6747-6
Abstract
3-methyl-1-(ethylacetyl)imidazolium chloride ([EtMIM]Cl), was synthesized for chitosan dissolution, and the dissolution and regeneration behaviors of chitosan in [EtMIM]Cl were thoroughly investigated. The solubility of chitosan in [EtMIM]Cl was measured at temperatures ranging from 40 °C to 110 °C, based on which the thermodynamic parameters of chitosan in [EtMIM]Cl were calculated. The polarizability and hydrogen bond accepting ability was determined by solvatochromic UV/vis spectroscopy. The regenerated chitosan from [EtMIM]Cl by adding methanol was characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Density functional theory (DFT) computations were performed to study the interactions between [EtMIM]Cl and chitobiose. Five kinds of hydrogen bonds, C-H/O, O-H/O, O-H/Cl, C-H/Cl, N-H/Cl were found, suggesting strong interactions between [EtMIM]Cl and chitobiose. In particular, the oxygen atom and the active methylene group of carboxylic ester in [EtMIM]+, formed strong hydrogen bonding with chitobiose. The molecular simulation results indicated that both the Cl− anions and [EtMIM]+ cation played important roles in the chitosan dissolution process, by the disruption of native hydrogen bonds of chitosan.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Journal or Publication Title: | Fibers and Polymers | ||||||||
Publisher: | Springer | ||||||||
ISSN: | 1229-9197 | ||||||||
Official Date: | November 2016 | ||||||||
Dates: |
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Volume: | 17 | ||||||||
Number: | 11 | ||||||||
Page Range: | pp. 1741-1748 | ||||||||
DOI: | 10.1007/s12221-016-6747-6 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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