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Cellulose

Erschienen in:

01.02.2012

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

verfasst von: Kim Anh Le, Romain Sescousse, Tatiana Budtova

Erschienen in: Cellulose | Ausgabe 1/2012

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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.

Vorheriger Artikel The effect of subcritical carbon dioxide on the dissolution of cellulose in the ionic liquid 1-ethyl-3-methylimidazolium acetate

Nächster Artikel Studies concerning the accessibility of different allomorphic forms of cellulose

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Titel: Influence of water on cellulose-EMIMAc solution properties: a viscometric study
verfasst von: Kim Anh Le
Romain Sescousse
Tatiana Budtova
Publikationsdatum: 01.02.2012
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 1/2012
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-011-9610-3

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