The extrusion flow instabilities of three commercial styrene-butadiene rubbers (SBR) are investigated as a function of molecular weight distribution (MWD); molecular architecture (linear, branched); and temperature. The samples have multimodal MWD, with the main component being SBR and a low amount, less than 10 wt. %, of low-molecular weight hydrocarbons. Deviation from the Cox–Merz rule at high angular frequencies/shear rates becomes intense as the amount of medium-molecular weight component increases. Optical analysis is used to identify and quantify spatial surface distortions, specifically wavelength (λ) and height (h), of the different types of extrusion flow instabilities. Qualitative constitutive models are reviewed and used to fit the experimental data for the spatial characteristics of extrusion flow instability. The fitting parameters as obtained by the models are correlated with molecular properties of the materials. It is found that the characteristic spatial wavelength (λ) increases as the extrusion temperature decreases. Hence, the influence of temperature on the spatial characteristic wavelength is investigated and an Arrhenius behavior is observed.
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Modeling the spatial characteristics of extrusion flow instabilities for styrene-butadiene rubbers: Investigating the influence of molecular weight distribution, molecular architecture, and temperature
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September 2021
Research Article|
September 21 2021
Modeling the spatial characteristics of extrusion flow instabilities for styrene-butadiene rubbers: Investigating the influence of molecular weight distribution, molecular architecture, and temperature
Christos K. Georgantopoulos;
Christos K. Georgantopoulos
1
Institute of Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT)
, Engesserstraße 18, 76131 Karlsruhe, Germany
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Masood K. Esfahani;
Masood K. Esfahani
1
Institute of Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT)
, Engesserstraße 18, 76131 Karlsruhe, Germany
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Carlo Botha;
Carlo Botha
1
Institute of Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT)
, Engesserstraße 18, 76131 Karlsruhe, Germany
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Michael A. Pollard;
Michael A. Pollard
1
Institute of Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT)
, Engesserstraße 18, 76131 Karlsruhe, Germany
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Ingo F. C. Naue;
Ingo F. C. Naue
1
Institute of Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT)
, Engesserstraße 18, 76131 Karlsruhe, Germany
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Andrea Causa;
Andrea Causa
2
Pirelli Tyre S. p. A., R&D
, Viale Piero e Alberto Pirelli 25, 20126 Milan, Italy
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Roland Kádár
;
Roland Kádár
3
Department of Industrial and Materials Science, Division of Engineering Materials, Chalmers University of Technology
, SE-412 96 Gothenburg, Sweden
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Manfred Wilhelm
Manfred Wilhelm
a)
1
Institute of Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT)
, Engesserstraße 18, 76131 Karlsruhe, Germany
a)Author to whom correspondence should be addressed: manfred.wilhelm@kit.edu
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a)Author to whom correspondence should be addressed: manfred.wilhelm@kit.edu
Physics of Fluids 33, 093108 (2021)
Article history
Received:
June 25 2021
Accepted:
August 20 2021
Citation
Christos K. Georgantopoulos, Masood K. Esfahani, Carlo Botha, Michael A. Pollard, Ingo F. C. Naue, Andrea Causa, Roland Kádár, Manfred Wilhelm; Modeling the spatial characteristics of extrusion flow instabilities for styrene-butadiene rubbers: Investigating the influence of molecular weight distribution, molecular architecture, and temperature. Physics of Fluids 1 September 2021; 33 (9): 093108. https://doi.org/10.1063/5.0061334
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