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The viscoelastic signature underpinning polymer deformation under shear flow
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Inst Laue Langevin, Grenoble, France.ORCID iD: 0000-0001-7904-5639
Inst Laue Langevin, Grenoble, France.ORCID iD: 0000-0002-6008-1987
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0002-3775-5277
Inst Laue Langevin, Grenoble, France; Lund University, Dept Phys Chem, Lund, Sweden.
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2019 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 15, no 3, p. 371-380Article in journal (Refereed) Published
Abstract [en]

Entangled polymers are deformed by a strong shear flow. The shape of the polymer, called the form factor, is measured by small angle neutron scattering. However, the real-space molecular structure is not directly available from the reciprocal-space data, due to the phase problem. Instead, the data has to be fitted with a theoretical model of the molecule. We approximate the unknown structure using piecewise straight segments, from which we derive an analytical form factor. We fit it to our data on a semi-dilute entangled polystyrene solution under in situ shear flow. The character of the deformation is shown to lie between that of a single ideal chain (viscous) and a cross-linked network (elastic rubber). Furthermore, we use the fitted structure to estimate the mechanical stress, and find a fairly good agreement with rheology literature.

Place, publisher, year, edition, pages
2019. Vol. 15, no 3, p. 371-380
National Category
Polymer Chemistry Physical Chemistry
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URN: urn:nbn:se:uu:diva-377358DOI: 10.1039/c8sm02255kISI: 000457278300018PubMedID: 30519692OAI: oai:DiVA.org:uu-377358DiVA, id: diva2:1289856
Funder
Swedish Research CouncilCarl Tryggers foundation , CTS 16:519Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved

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