Solubility of starch and microcrystalline cellulose in 1-ethyl-3-methylimidazolium acetate ionic liquid and solution rheological properties

Tan, Xiaoyan, Li, Xiaoxi, Chen, Ling and Xie, Fengwei (2016) Solubility of starch and microcrystalline cellulose in 1-ethyl-3-methylimidazolium acetate ionic liquid and solution rheological properties. Physical Chemistry Chemical Physics, 18 39: 27584-27593. doi:10.1039/c6cp04426c


Author Tan, Xiaoyan
Li, Xiaoxi
Chen, Ling
Xie, Fengwei
Title Solubility of starch and microcrystalline cellulose in 1-ethyl-3-methylimidazolium acetate ionic liquid and solution rheological properties
Journal name Physical Chemistry Chemical Physics   Check publisher's open access policy
ISSN 1463-9076
1463-9084
Publication date 2016-10-21
Year available 2016
Sub-type Article (original research)
DOI 10.1039/c6cp04426c
Open Access Status Not yet assessed
Volume 18
Issue 39
Start page 27584
End page 27593
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Abstract This study compared the solubility of starch (G50) and microcrystalline cellulose (MCC) in an ionic liquid (IL), 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), at different temperatures. From SAXS and WAXS analysis, polysaccharides could be totally dissolved in [Emim][OAc]. Fourier-transform infrared (FTIR) spectra showed a similar dissolution mechanism for starch and MCC, which was related to the formation of hydrogen bonds between polysaccharide hydroxyls and acetic anions, causing the breakage of the hydrogen bonding network of the polysaccharide. The polysaccharide-[Emim][OAc] solutions displayed viscosity in the order of G50-[Emim][OAc] < G50/MCC-[Emim][OAc] < MCC-[Emim][OAc], which led to speculation that the molecular chain of G50 and MCC existed concordantly in [Emim][OAc]. The intrinsic viscosity study showed that G50 was much less temperature-sensitive than MCC, and G50/MCC solutions showed intermediate and tuned behaviors. Steady-shear measurements indicated that for dilute solutions, there was a slightly shear-thinning behavior at low shear rates, and high concentration solutions presented an apparent shear-thinning behavior at high shear rates. These characteristics also reflect the different conformation of polysaccharide chains in the solution, which guides the processing of polysaccharide materials and composites for the desired structure and properties.
Keyword Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID U1501214
31271824
2014YT02S029
20120172110014
NCET-12-0193
2014A2FC217
2014B090904047
201607010109
2015ZZ106
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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