SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Composites and Functional Polymer Hybrids

CPP 13.5: Vortrag

Montag, 27. März 2023, 16:30–16:45, ZEU 255

Modeling micro-structure evolution and its impact on moduli in magneto-active elastomers — •Mehran Roghani, Dirk Romeis, and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden, Germany

Magneto Active Elastomers (MAEs) are field-controllable composites made of micron-sized, magnetizable particles embedded into a soft elastomeric matrix. These materials show a strong coupling between their mechanical properties and an applied magnetic field. The coupling can be directly related to magnetic interactions between the particles, which lead to the evolution of microstructure under the field. In the case of initially isotropic MAEs, this micro-structure evolution results in chains forming from the magnetized particles. This in turn causes a huge increase in the mechanical moduli along the field direction, leading to anisotropic behavior. We consider a transversely isotropic material model for the mechanics, and magnetic interactions are taken into account by the dipolar mean field approach. To couple the mechanical and magnetic effects, a restructuring parameter is introduced which is a function of material magnetization and moduli. This modeling approach improves our understanding of how microstructure evolution affects magnetically induced material deformation and stiffness. The first predictions are in good agreement with experimental results available in the literature. We thank the DFG for financial support through RTG-2430.