Samenvatting
We explore the behavior of a supramolecular polymer subjected to repeated shear-startup runs. This interesting test was proposed 50 years ago as a measure of disentanglement kinetics in linear polymers. A key experimental finding was that the recovery time (originally attributed exclusively to the relaxation of partially disentangled state) decreased with increasing imposed shear rate. Recent modeling and simulations put the work in perspective by showing that the recovery time mainly reflects chain reorientation. However, for the present supramolecular polymer, the recovery time was found to be rate independent. This drastic difference is attributed to the different mechanism of stress relaxation, which involves a combination of bond breaking/recombination and reptation processes. Hence, the repeated shear-startup protocol may serve as a sensitive indicator of (supramolecular) polymer signatures and a tool to evaluate stress relaxation models.
| Originele taal-2 | Engels |
|---|---|
| Artikelnummer | 105021 |
| Tijdschrift | Journal of Non-Newtonian Fluid Mechanics |
| Volume | 315 |
| DOI's | |
| Status | Gepubliceerd - mei 2023 |
Bibliografische nota
Publisher Copyright:© 2023 Elsevier B.V.
Financiering
It is a pleasure to contribute to this special issue of JNNFM honoring Professor Evan Mitsoulis, a friend and colleague of many years, who has made significant contributions to computational viscoelastic fluid mechanics and was instrumental in establishing the Hellenic Society of Rheology. Partial support has been received by the European Commission (Horizon2020-INFRAIA-2016-1, EUSMI grant no. 731019).