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.
| Original language | English |
|---|---|
| Pages (from-to) | 27584-27593 |
| Number of pages | 10 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 18 |
| Issue number | 39 |
| DOIs | |
| Publication status | Published - 8 Sept 2016 |
Bibliographical note
Publisher Copyright:© 2016 the Owner Societies.
Funding
This research has been financially supported under the NSFC-Guangdong Joint Foundation Key Project (No. U1501214), the National Natural Science Foundation of China (NSFC) (No. 31271824), the YangFan Innovative and Entrepreneurial Research Team Project (No. 2014YT02S029), the Ministry of Education Special R&D Funds for the Doctoral Discipline Stations in Universities (No. 20120172110014), the Ministry of Education Program for Supporting New Century Excellent Talents (No. NCET-12-0193), the Key R&D Projects of Zhongshan (No. 2014A2FC217), the R&D Projects of Guangdong Province (No. 2014B090904047), the Science and Technology Projects of Guangzhou (No. 201607010109) and the Fundamental Research Funds for the Central Universities (No. 2015ZZ106). The SAXS/WAXS work in this research was undertaken on the SAXS/WAXS beamline at the Australian Synchrotron, Victoria, Australia. X. Tan also would like to thank the China Scholarship Council (CSC) for providing research funding for his visiting studies at The University of Queensland (UQ), Australia, as part of his PhD work.
| Funders | Funder number |
|---|---|
| Key R&D Projects of Zhongshan | 2014A2FC217 |
| Ministry of Education Program for Supporting New Century Excellent Talents | NCET-12-0193 |
| Ministry of Education Special R&D Funds for the Doctoral Discipline Stations in Universities | 20120172110014 |
| NSFC-Guangdong Joint Foundation | U1501214 |
| R&D Projects of Guangdong Province | 2014B090904047 |
| YangFan Innovative and Entrepreneurial Research Team Project | 2014YT02S029 |
| University of Queensland | |
| National Natural Science Foundation of China | 31271824 |
| Guangzhou Science and Technology Program key projects | 201607010109 |
| China Scholarship Council | |
| Fundamental Research Funds for the Central Universities | 2015ZZ106 |
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry