Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Polymer Networks and Dynamics I: Elastomers and Magnetic Materials

CPP 5.7: Vortrag

Montag, 20. März 2017, 12:15–12:30, ZEU 255

The Dipolar Mean Field Model: A promising Ansatz to describe Magneto-Sensitive Elastomers — •Dirk Romeis and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden e.V., D-01069 Dresden, Germany

Magneto-sensitive elastomers are composed of magnetizable micro-particles embedded into a soft-elastic polymer network. In the presence of an external magnetic field these composites can change their mechanical properties significantly. The precise relations and conditions responsible for the actual changes are not fully understood, neither experimentally nor theoretically. Recently, we developed a dipolar mean field approach [1] to describe the effective behavior of such composites in the macroscopic limit. The approach itself provides a very efficient calculation method for various situations and it is partially even analytically solvable. This allows a comprehensive understanding of the mechanisms underlying the behavior of magneto-sensitive elastomers and we are able to predict a discontinuous shape change for very oblate samples. It will also be shown, that the results for the case of a random isotropic distribution of magnetizable particles in the elastomer are in quantitative agreement with a micro-scale continuum model [2].

Literature

[1] Romeis D. et. al. Soft Matter 12, 9364-9376 (2016)

[2] Metsch P. et. al. Comp. Mat. Science 124, 365-374 (2016)