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Determination of elongational viscosity of polymer melts by RME and Rheotens experiments

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Abstract.

Several linear (LLDPE, HDPE, PS) and long-chain-branched (LDPE, PP) polymer melts were investigated by an elongational rheometer (RME Rheometrics) and by Rheotens (Göttfert). The Molecular Stress Function (MSF) theory is briefly reviewed and used to extrapolate the steady-state elongational viscosity. To evaluate Rheotens experiments, a new process model is introduced which assumes that the elongational viscosity in the Rheotens test is a function of the draw ratio only. The apparent elongational viscosities extracted from Rheotens curves are found to lie in between the steady-state elongational viscosity and three times the shear viscosity.

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Authors and Affiliations

  1. Polymertechnik/Polymerphysik, Institut für Werkstoffwissenschaften und –technologien, TU Berlin, Germany, Germany

    Manfred H. Wagner

  2. Institut für Kunststofftechnologie, Universität Stuttgart, Germany, Germany

    Heike Bastian & Anka Bernnat

  3. INA Werk Schaeffler oHG, Herzogenaurach, Germany, Germany

    Stefan Kurzbeck

  4. BP Amoco Chemicals, Lavèra, France, France

    Choon K. Chai

Authors
  1. Manfred H. Wagner
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  2. Heike Bastian
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  3. Anka Bernnat
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  4. Stefan Kurzbeck
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  5. Choon K. Chai
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Correspondence to Manfred H. Wagner.

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Wagner, M.H., Bastian, H., Bernnat, A. et al. Determination of elongational viscosity of polymer melts by RME and Rheotens experiments. Rheol Acta 41, 316–325 (2002). https://doi.org/10.1007/s00397-002-0228-0

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  • DOI: https://doi.org/10.1007/s00397-002-0228-0

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