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Influence of water on cellulose-EMIMAc solution properties: a viscometric study

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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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Acknowledgments

The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement no. 214653. We should like to thank Christian Peiti, CEMEF, for the help in the rheological measurements. TB is grateful to Hans-Peter Fink, Fraunhofer IAP, Golm, Germany, for a fruitful discussion.

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Correspondence to Tatiana Budtova.

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Le, K.A., Sescousse, R. & Budtova, T. Influence of water on cellulose-EMIMAc solution properties: a viscometric study. Cellulose 19, 45–54 (2012). https://doi.org/10.1007/s10570-011-9610-3

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