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dc.contributor.authorClarke, N.C.*
dc.contributor.authorDe Luca, E.*
dc.contributor.authorBent, J.*
dc.contributor.authorBuxton, G.*
dc.contributor.authorGough, Timothy D.*
dc.contributor.authorGrillo, I.*
dc.contributor.authorHutchings, L.R.*
dc.date.accessioned2009-10-12T14:11:09Z
dc.date.available2009-10-12T14:11:09Z
dc.date.issued2006
dc.identifier.citationClarke, N.C., De Luca, E., Bent, J., Buxton, G. and Gough, T.D. et al. (2006). Polymer blends in a contraction-expansion flow. Macromolecules. Vol. 39, No. 22, pp. 7607-7616.en
dc.identifier.urihttp://hdl.handle.net/10454/3643
dc.descriptionNoen
dc.description.abstractWe have probed the coupling between flow and concentration fluctuations in polymer blends using small-angle neutron scattering. We utilized a recirculating cell with a slot die, enabling us to measure the behavior at the entrance, within and at the exit of a contraction-expansion flow. While, as expected, anisotropy was observed in all nonquiescent experiments, the correlation lengths associated with the concentration fluctuations are found to be "stretched" more in the direction perpendicular to the flow at all positions along the centerline of the flow, except at the slot die exit. To gain insight into the observations, we present calculations of the scattering based on a multiscale approach, which bridges the gap between macroscopic Newtonian fluid dynamics and the convection of nanoscale concentration fluctuations. However, we find that this model contains insufficient physics to correctly describe our observations. Consequently, we argue that the deformation of the correlation length is primarily due to the coupling between weakly non-Newtonian stresses and thermodynamicsen
dc.language.isoenen
dc.relation.isreferencedbyhttp://dx.doi.org/10.1021/ma0610966en
dc.subjectExperimental studyen
dc.subjectModelingen
dc.subjectLateral distributionen
dc.subjectLongitudinal distributionen
dc.subjectInteraction parameteren
dc.subjectFlow fielden
dc.subjectStructure factoren
dc.subjectConcentration fluctuationen
dc.subjectSudden contractionen
dc.subjectFlow(fluid)en
dc.subjectStyrene(alpha-methyl) polymeren
dc.subjectPolymer blendsen
dc.titlePolymer blends in a contraction-expansion flow.en
dc.status.refereedYesen
dc.typeArticleen
dc.type.versionNo full-text available in the repositoryen


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