Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Focus: Field Controllable Functional Polymers II

CPP 13.5: Hauptvortrag

Montag, 16. März 2015, 16:00–16:30, C 264

Magnetic particles in polymer harness: Modeling mesoscopic magnetomechanics of polymer composites — •Yuriy Raikher^1,2 and Oleg Stolbov^1,2 — ¹Institute of Continuous Media Mechanics, Ural Branch of RAS, Perm, 614013, Russia — ²Perm National Research Polytechnic University, Perm, 614990, Russia

Weakly-linked rubber-like materials filled with micron-size multi-domain grains are nowadays considered as the most technologically desirable media. They are sufficiently soft elastically and sufficiently loaded magnetically as to display strong magnetomechanical effects like field-induced strains, tuning of the elastic modulus, etc. In now discussed and tested applications of these soft magnetic elastomers (SMEs), a usual working element is a 3D sample. Here we consider SME films, which are more flexible mechanically and, thus, more sensitive to the field than the 3D ones. The macroscopic behavior of a SME film comes out as a net result of the particle-matrix interaction. In such samples, the particle displacements crucially depend on the direction of the applied field. Moreover, in the numerical modeling, we use, instead of the customary dipole-dipole potential, another one, which much better accounts for the magnetic softness of the multi-domain particles. The field-induced response of SME films at the mesoscopic scale is discussed and projected to the macroscopic observations. Support by RFBR grants 13-01-96056 and 14-02-96003 and project MIG S26/617 from the Ministry of Education and Science of Perm Region are acknowledged.