Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 59: Composites and Functional Polymer Hybrids

CPP 59.3: Vortrag

Donnerstag, 4. April 2019, 15:45–16:00, H8

Touching and detachment: Nickel-particle movement in an elastomer matrix under exertion to magnetic field — •Henrik Schmidt¹ and Günter K. Auernhammer² — ¹Max Planck Institute for Polymer Research, Mainz, Germany — ²Leibniz Institute for Polymer Research, Dresden, Germany

Magnetorheological elastomers are hybrid materials comprising a non-magnetic polymer matrix with interspersed magnetic filler particles. As they are complementary to MR fluids and MR foams they gained a lot of interest for applications. To be useful the volume ratio of particles has to be in the order where the particle distance is roughly around one particle diameter. To get a basic idea of the mutual interaction under a rotating magnetic field we reduced the system to two superparamagnetic nickel particles enclosed by a PDMS-matrix. For the correct parameters of particle diameter, distance and elastic modulus of the surrounding matrix the system exhibit a new state described in the following: After applying the magnetic field particles snap into contact. During rotation the particles separate at certain points to take their original position. Thus the particle distance shows a hysteresis in relation to the angle between magnetic field and particle axes. Calculating the dipole interaction shows an agreement with the experiments even though in contact a treatment of the particles as point-like dipoles should be not valid. Presented state of the MREs needs to be compared to theoretical models.