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Issue 3, 2019
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The viscoelastic signature underpinning polymer deformation under shear flow

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Abstract

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.

Graphical abstract: The viscoelastic signature underpinning polymer deformation under shear flow

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Publication details

The article was received on 04 Nov 2018, accepted on 19 Nov 2018 and first published on 20 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM02255K
Citation: Soft Matter, 2019,15, 371-380
  • Open access: Creative Commons BY-NC license
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    The viscoelastic signature underpinning polymer deformation under shear flow

    A. Korolkovas, S. Prévost, M. Kawecki, A. Devishvili, F. A. Adlmann, P. Gutfreund and M. Wolff, Soft Matter, 2019, 15, 371
    DOI: 10.1039/C8SM02255K

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