Influence of water on cellulose-EMIMAc solution properties: a viscometric study |
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Authors: | Kim Anh Le Romain Sescousse Tatiana Budtova |
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Institution: | (1) Mines ParisTech, Centre de Mise en Forme des Mat?riaux (CEMEF), UMR CNRS 7635, BP 207, 06904 Sophia-Antipolis, France; |
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Abstract: | The influence of water on cellulose dissolved in 1-ethyl-3-methylimidazolium acetate (EMIMAc) is analysed by measuring steady
state viscosity of dilute solutions. The goal is to determine: (a) the maximal water content allowing keeping cellulose dissolved
(in dilute regime) and (b) the influence of water on solution flow and cellulose hydrodynamic properties. Mixing EMIMAc and
water is exothermal and EMIMAc-water viscosity does not obey a logarithmic mixing rule suggesting strong interactions between
the components. Newtonian flow of cellulose-EMIMAc-water solutions was recorded at water concentrations below 15 wt% and a
shear thinning was observed for higher water content. It was suggested that above 15 wt% water cellulose is not completely
dissolved: swollen aggregates form a sort of a “suspension” which is structuring under shear. Cellulose intrinsic viscosity
showed a peak at 10 wt% water-90 wt% EMIMAc. It was hypothesised that the addition of water leads to the formation of large
cellulose aggregates due to the preferential cellulose–cellulose interactions. |
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