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Étude du démouillage de systèmes multicouches polymères ultra-minces sous cisaillement

Abstract : The objective of this PhD work was to study the role of shear on the rupture of ultra-thin polymer films, by coupling a numerical study to an experimental one. First, a numerical method adapted to the resolution of the thin film equation was set up without shear but taking into account the capillary and van der Waals forces. This method was validated by comparing the dynamics obtained to theoretical predictions. With the addition of shear, two regimes have then been evidenced as a function of the shear rate: in the case of low shear rates the rupture is delayed, while at higher shear rates it is suppressed. The use of spatio-temporal diagrams allowed the characterization of the interface deformation. The transition from the delayed to the suppressed rupture regime is similar to a phase transition. The experimental study at low shear rate allowed to confirm this delayed rupture, but also showed after the rupture an increased dewetting speed. This study will allow a better understanding of the rupture phenomena occurring during nanolayer coextrusion.
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Submitted on : Monday, January 17, 2022 - 10:16:38 AM
Last modification on : Tuesday, September 27, 2022 - 10:34:33 AM

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  • HAL Id : tel-03483534, version 3

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Kheireddin Kadri. Étude du démouillage de systèmes multicouches polymères ultra-minces sous cisaillement. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE067⟩. ⟨tel-03483534v3⟩

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