Dissolution and Rheological Behavior of Collagen in Ionic Liquids
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Abstract:
The solubility and steady-state rheological behavior of collagen in the ionic liquids based on choline chloride?2ZnCl2 were studied. The collagen was regenerated using water, ethanol, and acetonitrile. The structure of regenerated collagen was characterized by Fourier transform infrared spectroscopy (FT-IR), wide angle X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (DSC). Choline Chloride?2ZnCl2 was used as the direct solvent for collagen, and the solubility of collagen in the ionic liquid at 120 ℃ was up to 11.3 g ± 0.2 g/100 g. The FT-IR results revealed that the acetonitrile-regenerated collagen had a complete triple helical structure, while the crystallinity and thermal stability of the regenerated collagen were somewhat lower than those of the original sample. The steady-state shear rheological analysis showed that the viscosity of collagen/choline chloride?2ZnCl2 increased with increasing concentrations of solution and decreased with increasing shear rates, which are the characteristic features of a pseudoplastic fluid. When the mass fraction was 3 g/100 g, the shear-thinning phenomenon was observed in solution. Furthermore, the solution viscosity was almost disappeared when the temperature was 90 ℃ and the shear rate was 100 s-1.
