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Stress relaxation of bi-disperse polystyrene melts

Exploring the interactions between long and short chains in non-linear rheology

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Abstract

We present start-up of uniaxial extension followed by stress relaxation experiments of a bi-disperse 50 % by weight blend of 95k and 545k molecular weight polystyrene. We also show, for comparison, stress relaxation measurements of the polystyrene melts with molecular weight 95k and 545k, which are the components of the bi-disperse melt. The measurements show three separated relaxation regimes: a fast regime, a transition regime, and a slow regime. In the fast regime, the orientation of the long chains is frozen and the stress relaxation is due to stretch relaxation of the short chains primarily. Conversely in the slow regime, the long chains have retracted and undergo relaxation of orientation in fully relaxed short chains.

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Acknowledgments

The research leading to these results has received funding from the Danish Council for Independent Research - Natural Sciences under EPMEF on Grant 0602-02179B, and Aage og Johanne Louis-Hansens Fond. We would like to thank the anonymous reviewers for constructive observations and suggestions.

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Authors and Affiliations

  1. Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs., Lyngby, Denmark

    Ludovica Hengeller, Qian Huang & Ole Hassager

  2. Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Kgs., Lyngby, Denmark

    Andriy Dorokhin & Kristoffer Almdal

  3. Department of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA, USA

    Nicolas J. Alvarez

Authors
  1. Ludovica Hengeller
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  2. Qian Huang
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  3. Andriy Dorokhin
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  4. Nicolas J. Alvarez
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  5. Kristoffer Almdal
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  6. Ole Hassager
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Correspondence to Ole Hassager.

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Hengeller, L., Huang, Q., Dorokhin, A. et al. Stress relaxation of bi-disperse polystyrene melts. Rheol Acta 55, 303–314 (2016). https://doi.org/10.1007/s00397-016-0916-9

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  • DOI: https://doi.org/10.1007/s00397-016-0916-9

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