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A new type of visco-plastic flow curve observed in certain concentrated diblock copolymer solutions

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Abstract

A diblock copolymer of styrene and isoprene (hydrogenated) is dissolved in C11/C12 n-paraffins and o-xylene (or cyclohexane) mixtures. An unusual type of flow curve is obtained in certain ranges of composition and under certain conditions of preparation. With increasing shear rates, the flow curve is first of the Bingham type, followed by a sudden shear thickening at almost discrete rate of shear and then by a second branch of almost linear increase. Time independent and reproducible behaviour can be achieved. A linear model is proposed and the possible molecular arrangement that corresponds to this model is discussed.

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Authors and Affiliations

  1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-3300, Braunschweig, ČSSR

    H. Bauer & G. Meerlender

  2. Institute of Hydrodynamics, Czechoslovak Academy of Sciences, Podbabská 13, 16612, Prague, ČSSR

    P. Štern

Authors
  1. H. Bauer
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  2. G. Meerlender
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  3. P. Štern
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Bauer, H., Meerlender, G. & Štern, P. A new type of visco-plastic flow curve observed in certain concentrated diblock copolymer solutions. Rheol Acta 25, 389–396 (1986). https://doi.org/10.1007/BF01331510

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  • DOI: https://doi.org/10.1007/BF01331510

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