KADRI, Kheireddin; PEIXINHO, Jorge; SALEZ, Thomas; MIQUELARD-GARNIER, Guillaume; SOLLOGOUB, Cyrille

doi:10.1016/j.polymer.2021.124283

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KADRI, Kheireddin
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

PEIXINHO, Jorge
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

SALEZ, Thomas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Polymer. 2021-10-19, vol. 235, p. 124283

Elsevier

Résumé en anglais

The objective of this work is to give new insight into the stability of thin polymer films under shear, in order to pave the way to a better control of the nanolayer coextrusion process. To do so, a finite-difference numerical scheme for the resolution of the thin film equation was set up taking into account capillary and van der Waals (vdW) forces. This method was validated by comparing the dynamics obtained from an initial harmonic perturbation to established theoretical predictions. With the addition of shear, three regimes have then been evidenced as a function of the shear rate. In the case of low shear rates the rupture is delayed when compared to the no-shear problem, while at higher shear rates it is even suppressed: the perturbed interface goes back to its unperturbed state over time. In between these two limiting regimes, a transient one in which shear and vdW forces balance each other, leading to a non-monotonic temporal evolution of the perturbed interface, has been identified. While a linear analysis is sufficient to describe the rupture time in the absence of shear, the nonlinearities appear to be essential otherwise.< Réduire

Mots clés en anglais

Polymers and Plastics

Materials Chemistry

Organic Chemistry

DOI

http://dx.doi.org/10.1016/j.polymer.2021.124283

Project ANR

Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010

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Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798