Creep and creep recovery measurements of several mLLDPEs were used to investigate the time dependence and to determine both the zero shear‐rate viscosity and the steady‐state elastic recovery compliance The well‐known correlation between the zero shear‐rate viscosity and the molar mass was found to be obeyed by all samples containing comonomer contents up to 29 wt.‐%, too. This is somewhat surprising, as such a high comonomer content means that more than 25 wt.‐% of the molar mass are not in the main chain and thus the number of entanglements should be significantly reduced. For the linear steady‐state elastic compliance an increase with growing molar mass (for constant molar mass distribution) was observed independent of the kind and content of the comonomer. The reasons for this molar mass dependence of are not clear, as independent of was found for linear monodisperse polymers, but might be attributed to intrachain phase separation. However, to our knowledge this is one of the first studies so far for polydisperse polyethylenes with constant MMD.
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7 July 2008
THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting
3–8 August 2008
Monterey (California)
Research Article|
July 07 2008
Elastic and Viscous Properties of Linear and Long‐Chain Branched Ethene/α‐Olefin Copolymers in the Terminal Regime
Florian J. Stadler;
Florian J. Stadler
aInstitute of Polymer Materials, Friedrich‐Alexander‐University Erlangen‐Nürnberg, Martensstr. 7, 91058 Erlangen, Germany
bUnité des Hauts Polymères, Université catholique de Louvain, B‐1348 Louvain‐la‐Neuve, Belgium
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Helmut Münstedt
Helmut Münstedt
aInstitute of Polymer Materials, Friedrich‐Alexander‐University Erlangen‐Nürnberg, Martensstr. 7, 91058 Erlangen, Germany
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AIP Conf. Proc. 1027, 470–472 (2008)
Citation
Florian J. Stadler, Helmut Münstedt; Elastic and Viscous Properties of Linear and Long‐Chain Branched Ethene/α‐Olefin Copolymers in the Terminal Regime. AIP Conf. Proc. 7 July 2008; 1027 (1): 470–472. https://doi.org/10.1063/1.2964732
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