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Title
Physics of cellulose xanthate dissolution in sodium hydroxide-water mixtures: A rheo-optical study
Authors
Nicolas Le Moigne and Patrick Navard
Received
March 2, 2010
Published
Volume 44 Issue 7-8 July-August
Keywords
viscose, cellulose xanthate, dissolution
Abstract
The way cellulose xanthate (viscose) fibres dissolve in sodium hydroxide–water mixtures is studied in situ, under flow, using a counter rotating optical rheometer. When a bunch of viscose fibres is placed in a solvent, a visco-elastic shell is formed, slowing down the diffusion of the solvent to non-dissolved fibres. It forms a highly concentrated, visco-elastic phase that disperses slowly through a pulling mechanism sucking this visco-elastic solution into the solvent. Due to this mechanism, dispersion and distribution of cellulose xanthate into the solvent is very slow.
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