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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 98: Composites and Functional Polymer Hybrids

CPP 98.3: Vortrag

Donnerstag, 19. März 2020, 15:30–15:45, ZEU 114

Magneto-sensitive elastomer beyond the linear magnetization regime — •Dirk Romeis and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden e.V.

Magneto-Sensitive Elastomer (MSE) describes a composite material of a soft-elastic polymer network with embedded micron-sized magnetizable particles. Upon applying an external magnetic field, it can undergo large deformations. Due to the long-range nature of the magnetic interactions, the pronounced sensitivity to preparation conditions and a complex interplay of different mechanisms, such as deformation- and field-induced particle rearrangements, the theoretical description of MSE represents a challenging task. Accordingly, various simplifying assumptions are introduced. A very prominent simplification is the restriction to an exclusive linear magnetization behavior. Often in experiments, and in order to yield pronounced effects, rather large magnetic fields are applied where the linear approximation regime is no longer justified. We will present a generalized theoretical approach which correctly describes the low and the large field limit, and also provides a reasonable approximation for intermediate field strengths. Furthermore, we show how this formalism can be adopted to account additionally for different MSE sample forms.