Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 73: Functional Polymer Hybrids and Composites

CPP 73.4: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, PC 203

Influence of particle microstructure on the effect of magnetostriction in magneto-sensitive elastomers — •Dirk Romeis, Vladimir Toshchevikov, and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden e.V.

Magneto-sensitive elastomers (MSEs) are field-controllable composite materials with magnetically switchable properties. They consist of a soft-elastic polymer network with immersed magnetizable micro-particles. Under external magnetic field these composites can significantly change their mechanical properties. Recently, we developed a dipolar mean field approach [1] to predict the effective material behavior of MSE in the magnetic field. Especially for random isotropic distribution of the magnetizable particles we find a quantitative agreement with micro-scale continuum simulations [2]. Presently, the mean field approach is limited to special situations, such as a conservation of the particle microstructure and specific orientation of the magnetic field. However, for ultra-soft elastomer we expect the particles to rearrange into different structures if the external field is applied. We will present some modifications in order to describe the mechanical behavior of MSEs under more general conditions. This will help us to gain an enhanced understanding of this type of field-controllable polymer composites. This work was supported by DFG (Project GR 3725 / 7-2).

Literature

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

[2] Romeis D. et. al. Physical Review E 95, 042501 (2017)