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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster: Polymer Networks and Dynamics

CPP 17.3: Poster

Montag, 20. März 2017, 18:30–21:00, P1C

Low-frequency dynamics of anisotropic magneto-sensitive elastomers — Dmytro Ivaneyko, •Vladimir Toshchevikov, and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden

The low-frequency dynamics of magneto-sensitive elastomers (MSEs) with isotropic, chain-like and plane-like distributions of magnetic particles is studied under a uniform magnetic field H. A coarse-grained network model is used, in which the magnetic particles are positioned on the sites of a tetragonal lattice [1]. The lattice anisotropy is defined by the ratio α of average distances between neighboring particles along and perpendicular to the symmetry axis of an MSE. In our calculations we take into account the influence of the elastic network and magnetic interactions between the particles under the magnetic field. It is shown that the relaxation spectrum of MSE depends on α. The dynamic storage G' and loss G'' moduli are calculated for three different geometries of application of the oscillating shear strain with respect to the symmetry axis of MSE, coinciding with the direction of H. The application of the magnetic field leads to a strong anisotropy of G' and G'' moduli. Moreover, G' and G'' can change up to several orders of magnitude in agreement with recent experiments.

[1] Ivaneyko D. et al., Soft Matter, 2015, 11, 7627-7638; Ivaneyko D. et al., Soft Matter, 2016, submitted.