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dc.contributor.authorGough, Timothy D.*
dc.contributor.authorBent, J.*
dc.contributor.authorGraham, R.S.*
dc.contributor.authorHutchings, L.R.*
dc.contributor.authorCoates, Philip D.*
dc.contributor.authorRichards, R.W.*
dc.contributor.authorGroves, D.J.*
dc.contributor.authorEmbery, J.*
dc.contributor.authorNicholson, T.M.*
dc.contributor.authorMcLeish, T.C.B.*
dc.contributor.authorLikhtman, A.E.*
dc.contributor.authorHarlen, O.G.*
dc.contributor.authorRead, D.J.*
dc.contributor.authorGrillo, I.*
dc.date.accessioned2009-07-28T11:29:43Z
dc.date.available2009-07-28T11:29:43Z
dc.date.issued2006
dc.identifier.citationGraham, R.S., Bent, J., Hutchings, L.R., Richards, R.W., Groves, D.J., Embery, J., Nicholson, T.M., McLeish, T.C.B., Likhtman, A.E., Harlen, O.G., Read, D.J., Gough, T., Spares, R., Coates, P.D. and Grillo, I. (2006).Measuring and predicting the dynamics of linear monodisperse entangled polymers in rapid flow through an abrupt contraction: a small angle neutron scattering study. Macromolecules. Vol. 39, No. 7, pp. 2700-2709.en
dc.identifier.urihttp://hdl.handle.net/10454/3177
dc.descriptionNoen
dc.description.abstractSmall-angle neutron scattering measurements on a series of monodisperse linear entangled polystyrene melts in nonlinear flow through an abrupt 4:1 contraction have been made. Clear signatures of melt deformation and subsequent relaxation can be observed in the scattering patterns, which were taken along the centerline. These data are compared with the predictions of a recently derived molecular theory. Two levels of molecular theory are used: a detailed equation describing the evolution of molecular structure over all length scales relevant to the scattering data and a simplified version of the model, which is suitable for finite element computations. The velocity field for the complex melt flow is computed using the simplified model and scattering predictions are made by feeding these flow histories into the detailed model. The modeling quantitatively captures the full scattering intensity patterns over a broad range of data with independent variation of position within the contraction geometry, bulk flow rate and melt molecular weight. The study provides a strong, quantitative validation of current theoretical ideas concerning the microscopic dynamics of entangled polymers which builds upon existing comparisons with nonlinear mechanical stress data. Furthermore, we are able to confirm the appreciable length scale dependence of relaxation in polymer melts and highlight some wider implications of this phenomenon.en
dc.language.isoenen
dc.relation.isreferencedbyhttp://dx.doi.org/10.1021/ma052357zen
dc.subjectPolymer Scienceen
dc.subjectTube Modelen
dc.subjectNumerical-simulationen
dc.subjectMolten Polyethyleneen
dc.subjectMicroscopic Theoryen
dc.subjectMolecular Theoryen
dc.subjectBinary Blendsen
dc.subjectMelts Chainen
dc.subjectShear Networksen
dc.titleMeasuring and predicting the dynamics of linear monodisperse entangled polymers in rapid flow through an abrupt contraction: a small angle neutron scattering studyen
dc.status.refereedYesen
dc.typeArticleen
dc.type.versionNo full-text available in the repositoryen


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