Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Polymer Networks and Elastomers

CPP 3.7: Vortrag

Montag, 7. März 2016, 11:30–11:45, H40

Dynamic moduli of anisotropic magneto-sensitive elastomers — •Dmytro Ivaneyko, Vladimir Toshchevikov, and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden e.V.

The dynamic mechanical behavior of anisotropic magneto-sensitive elastomers (MSEs) with chain-like or plane-like distributions of magnetic particles is investigated in a low-frequency regime under a uniform external magnetic field. By this study we continue our previous work [1], in which a coarse-grained network model was proposed for description of dynamic mechanical behavior of isotropic MSEs. The average positions of magnetic particles are distributed on the sites of tetragonal lattice. The lattice anisotropy is defined by the ratio α of average distances between neighboring particles along and perpendicular to the symmetry axis: α=⟨ r_∥⟩/⟨ r_⊥⟩. Equations of motion for magnetic particles take into account the influence of the elastic network and magnetic interactions between the particles under external magnetic field. It is shown that the relaxation spectrum depends on the anisotropy parameter α. The shear dynamic moduli G′ and G″ of anisotropic MSEs are calculated for different geometries of application of the oscillating shear strain with respect to the magnetic field H, applied along the symmetry axis of the MSE.

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