Entangled linear polymers in fast shear and extensional flows: evaluating the performance of the Rolie-Poly model
(2021) Rheologica Acta : an international journal of rheology — Vol. 60, n° 10, p. 617-641 (2021)
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- Abstract
- This work evaluates the performance of the Rolie-Poly (RP) model in uniaxial elongation and shear. Predictions of four RP versions are compared against literature data for monodisperse, entangled polystyrene (PS) chains. The examined RP versions differ in two respects, namely, the method by which they implement reptation and finite extensibility (FENE). In some cases, the reptation term leads to unrealistic strain hardening at transient shear. In contrast, predictions at relaxation after shear and uniaxial elongation are practically unaffected by variations in the reptation term. For all examined flows, the FENE treatment has a considerable influence on the model outcomes. Comparison of RP predictions and data reveals successes as well as limitations of the model. For example, some systematic disagreements are evident when the Rouse Weissenberg (WiR) number exceeds ten. Possible improvement of the model by incorporation of overlooked mechanisms like entanglement loss and chain tumbling is discussed.
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Taghipour, H., & Hawke, L. G. D. (2021). Entangled linear polymers in fast shear and extensional flows: evaluating the performance of the Rolie-Poly model. Rheologica Acta : an international journal of rheology, 60(10), 617-641. https://doi.org/10.1007/s00397-021-01295-z (Original work published 2021)