Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: (Hydro) Gels and Elastomers
CPP 28.4: Vortrag
Mittwoch, 2. April 2014, 10:30–10:45, ZEU 222
Mechanical properties of magneto-sensitive elastomers with the finite shape and different particle distributions — •Dmytro Ivaneyko1,2, Vladimir Toshchevikov1, Marina Saphiannikova1, and Gert Heinrich1,2 — 1Technische Universität Dresden — 2Leibniz-Institut für Polymerforschung Dresden e.V.
A new theoretical formalism is developed for the studies of the mechanical behaviour of magneto-sensitive elastomers (MSEs) under a uniform external magnetic field [1]. This formalism allows to combine macroscopic continuum-mechanics and microscopic approaches for complex analysis of MSEs with different shapes and with different particle distributions. It is shown that starting from a model based on an explicit discrete particle distribution one can separate the magnetic field inside the MSE into two contributions: one which depends on the shape of the sample with finite size and the other, which depends on the local spatial particle distribution. The magneto-induced deformation and the change of elastic modulus are found to be either positive or negative, their dependences on the magnetic field being determined by a non-trivial interplay between these two contributions. Mechanical properties are studied for two opposite types of coupling between the particle distribution and the magneto-induced deformation: absence of elastic coupling and presence of strong affine coupling. Predictions of a new formalism are in a qualitative agreement with existing experimental data.
[1] D. Ivaneyko, V. Toshchevikov, M. Saphiannikova and G. Heinrich, Soft Matter, submitted.