Rheology of Concentrated Cellulose Solutions in 1-Butyl-3-methylimidazolium Chloride |
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Authors: | Xun Chen Yumei Zhang Lingyan Cheng Huaping Wang |
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Institution: | (1) State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, People’s Republic of China; |
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Abstract: | Rheological behavior of the concentrated cellulose/1-butyl-3-methylimidazolium chloride (BMIM]Cl) solutions was investigated.
As polymeric fluid, solutions of cellulose in BMIM]Cl display a marked elastic behavior under shear flow. The dependence
of the shear viscosity η, and of the dynamic modulus, on concentration, average degree of polymerization (DP) and temperature
is discussed. At lower concentrations and degrees of polymerization (DP), cellulose solutions show viscous, inelastic behavior
at low frequencies and low shear rate. At higher concentration and DP, cellulose solutions are more elastic at higher frequencies
and shear rate. Such solutions also have some usual rheological properties. The dynamic rheological responses revealed that
the Cox–Merz rule did not hold for these cellulose solutions at high deformation rate. Plotting storage modulus G′ against
loss modulus G″ gave almost a master curve which is independent of temperature and concentration, with the slope of about
1.651 for 10 wt% cellulose solutions. This value indicates the existence of microheterogeneity in the solution system. |
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