COARSE-GRAINED APPROACH FOR FAST SHEAR FLOW OF SOFT MATTER FLUIDS IN THE BULK MELT
(2017) 11th Annual European Rheology Conference — Location: Copenhagen, Denmark (3.April.2017)
Files
AERC2017-AbstractBook-20170322.pdf
Open Access - Adobe PDF
- 4.84 MB
Details
- Authors
Taghipour, Hamid 
- Abstract
- Our main goal is to provide insight on the non-linear shear rheology of entangled polymer chains. More specific, we would like to identify the molecular origin of the stress overshoot as well as to thoroughly understand how chain retraction and disentanglement are influenced by the deformation rate and the chain topology (e.g. linear or star chains). As a first step, we compare the predictions of two different tube models, namely the Rolie-Poly [1] and the Mead-Larson-Doi [2] (MLD) models, against experimental data on Poly-hydroxybutyrate (PHB) melts of linear topology [3]. Both aforementioned models incorporate the molecular mechanisms of reptation, chain stretch, chain retraction, and convective constraint release. To examine how chain retraction and disentanglement are influenced by the chain of topology, we consider the non-linear response of star polymers. We make appropriate modifications to the Rolie-Poly and MLD models, such as suppression of chain reptation and incorporation of arm retraction, as to compare their predictions against shear start-up data of 3-armed and 6-armed PHB chains [3]. We comment on the performance of the models; we also highlight similarities and/or differences, which we explain in terms of the underlying molecular physics and the way the latter have been implemented in the models.
- Affiliations
Citations
Taghipour, H., & Van Ruymbeke, E. (2017). COARSE-GRAINED APPROACH FOR FAST SHEAR FLOW OF SOFT MATTER FLUIDS IN THE BULK MELT. In Dr. Roland Kádár (ed.), AERC 2017. https://hdl.handle.net/2078.5/52729