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A viscometric study of temperature-induced attractive forces between polystyrene particles in aqueous solutions of cellulose ethers
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.ORCID iD: 0000-0002-1256-1708
2003 (English)In: Papers Presented at the Nordic Rheology Conference, Tórshavn, the Faroe Islands, June 1-3, 2003: General Papers and Papers from the Special Topic of Suspensions and Emulsions / [ed] Sarah L. Mason, The Nordic Rheology Society , 2003, Vol. 11, 117-122 p.Conference paper, (Other (popular science, discussion, etc.))
Abstract [en]

The effects of temperature and concentration of soluble polymer on colloidal stability in concentrated aqueous polystyrene (PS) suspensions containing ethyl(hydroxyethyl) cellulose (EHEC) and carboxymethyl cellulose (CMC) were investigated. Both polysaccharides caused destabilisation of the PS suspensions. An investigation of the relative viscosity as a function of the concentration of polysaccharide indicated different destabilisation mechanisms depending on the nature of the solvent-polysaccharide interaction and on the concentration of polysaccharide. An increase in concentration of polysaccharide within the investigated concentration range resulted in substantially higher degree of flocculation of the EHEC-containing suspension at 55°C, which is a temperature 10°C below the cloud point of the used EHEC grade. This behaviour showed that the flocculation mechanisms close to the cloud point of EHEC involved a considerable amount of added polysaccharide, which is typical for colloid destabilisation by surface induced phase separation. The CMC-containing suspensions showed flocculation behaviour typical for destabilisation by depleted polymers. The suspensions were drawn-down on polyester substrate and the resulting surface structures were interpreted by calculating the pair distribution functions. The viscosity of the aqueous phase of the suspensions seemed to be the predominant factor governing the surface structure. However, the disordering effect of surface induced phase separation seemed to have similar effects as high suspension viscosity

Place, publisher, year, edition, pages
The Nordic Rheology Society , 2003. Vol. 11, 117-122 p.
Series
Nordic Rheology Society. Annual transactions, ISSN 1601-4057
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-16681ISBN: 8798848623 (print)OAI: oai:DiVA.org:kau-16681DiVA: diva2:590273
Conference
Nordic Rheology Conference, Tórshavn, the Faroe Islands, June 1-3, 2003
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2015-10-28Bibliographically approved

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