Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 59: Composites and Functional Polymer Hybrids
CPP 59.8: Vortrag
Donnerstag, 4. April 2019, 17:15–17:30, H8
Implicit-medium model for viscoelastic properties of fractal-like aggregates polymer nanocomposites — •François Detcheverry1, Yang Wang1, Gaëtan Maurel2, Marc Couty2, and Samy Merabia1 — 1Univ Lyon, CNRS, Institut Lumière Matière, Villeurbanne, France — 2MFP MICHELIN 23, Place des Carmes-Déchaux Clermont-Ferrand, France
Dispersing solid fillers into a polymer matrix is a common strategy to enhance its properties. Polymer nanocomposites (PNCs) so obtained with fractal-like aggregates have exceptional rheological behavior long exploited in the tire industry. However, due to disparity of time and length scales, our understanding of the relation between nanocomposites structure and rheology remains incomplete. Here, we propose a mesoscopic model to simulate fractal-like aggregate PNCs. While aggregates are represented explicitly, we use for the polymer matrix an implicit description based on generalized Langevin and Stokes equations, that capture the average effect of a viscoelastic medium. Such a two-level description allows us to simulate large PNCs systems containing dozens of aggregates. Investigating the linear viscoelastic properties of PNCs, we find that compared to nanoparticles, aggregates may induce levels of reinforcement considerably larger and we characterize the influence of aggregate size, rigidity and volume fraction. We also examine the Payne effect and relate it to the alignment of aggregates under the imposed deformation. Our results may help in building connections between the macroscopic mechanical response of the PNCs and the mesoscopic morphology of the fillers.