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Shear-induced concentration fluctuations and form factor changes in polymer solution in the good-solvent regime

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Abstract.

Small-Angle Scattering from sheared semidilute polymer solution is reported in the good-solvent regime, at variance with former light and neutron measurements in the \(\Theta\) regime. First, concentration fluctuations are observed: the scattering increases noticeably along the flow at low q, but at variance with former results for the theta-solvent regime, no demixing is observed at higher shear. Here, instead, the effects follow a time-temperature superposition and saturate above a Weissenberg number around 5, like the stress which is known to present a plateau for these systems. Using the Zero Average Contrast technique, we have also measured the form factor, which displays the same saturation effect reaching a deformation ratio of the order of 2. These results agree with the Convective Constraint Release models (CCR) elaborated in order to predict the stress effects in the non-Newtonian regime (Marrucci-Ianniruberto) and their extension predicting also the scattering (Likhtman-Milner-McLeish).

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Authors and Affiliations

  1. Laboratoire de spectrométrie physique, CERMO, UJF - CNRS UMR 5588, F-38402 , Saint Martin d’Héres, France

    I. Morfin

  2. Institut Laue et Langevin, Ave. des martyrs, F-38049, Grenoble, France

    P. Lindner

  3. Laboratoire Léon Brillouin, CEA Saclay, F-91191, Gif-sur-Yvette, France

    F. Boué

Authors
  1. I. Morfin
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  2. P. Lindner
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  3. F. Boué
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Correspondence to I. Morfin.

Additional information

Received: 5 July 2004, Published online: 1 October 2004

PACS:

61.12.Ex Neutron scattering (including small-angle scattering) - 47.15.-x Laminar flow - 61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling

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Morfin, I., Lindner, P. & Boué, F. Shear-induced concentration fluctuations and form factor changes in polymer solution in the good-solvent regime. Eur. Phys. J. E 15, 41–45 (2004). https://doi.org/10.1140/epje/i2004-10033-1

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  • DOI: https://doi.org/10.1140/epje/i2004-10033-1

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