Effect Of The Elastomer Stiffness And
Coupling Agents On Rheological Properties
Of Magnetorheological Elastomers
Author(s)
A. Boczkowska & S. F. Awietjan
Abstract
The reported studies are related to a new group of intelligent materials, such as
magnetorheological elastomers (MREs), which are composites of ferromagnetic
particles embedded in elastomer matrix. Studies on fabrication of MREs were
carried out using two different polyurethane elastomers as a matrix,
ferromagnetic particles and coupling agent. The matrices were differed in
elastomer stiffness and hardness. As a ferromagnetic component carbonyl–iron
powder with particle size of 6-9 μm was used. Particles were oriented into chains
under the external magnetic field of 240 kA/m. Samples with anisotropic
particles arrangement and particles volume fraction equal to 11.5% were
examined. Microstructure of MREs was observed using Scanning Electron
Microscopy. Structural and magnetic anisotropy of the MREs was derived from
the magnetic studies. Rheological properties of the MREs, such as storage and
loss modulus and loss factor, were characterized as a function of shear frequency
and strength of the magnetic field. Absolute and relative magnetorheological
effects were calculated taking the microstructure into account, which was formed
in the course of the MRE fabrication, by changing the elastomer type and
application of the coupling agent. As a result of the studies it was found that the
MREs with stiffer matrix exhibit much lower MR effect than the soft ones. Also
the application of coupling agent lead to a decrease of MR effect by the
formation of bound elastomer surrounding the particles, which increases the
stiffness of the matrix.
Keywords: magnetorheological elastomers, polyurethanes, carbonyl iron,
rheological properties, coupling agents, microstructure, magnetic properties,
magnetorheological effect.
Keywords
magnetorheological elastomers, polyurethanes, carbonyl iron,
rheological properties, coupling agents, microstructure, magnetic properties,
magnetorheological effect
Related Book
Other papers in this volume
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