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Particle mobility and macroscopic magnetorheological effects for polyurethane magnetic elastomers The relationship between the particle mobility and magnetorheological effect was investigated for polyurethane magnetic elastomers containing carbonyl iron particles with various cross-linking densities or plasticizer concentrations. The storage modulus at 0 mT increased and the on-field modulus at 500 mT decreased with the cross-linking density.
Voids induce wide-range modulation of elasticity for magnetic elastomers II The magnetic response of dynamic modulus was investigated for polyurethane-based magnetic elastomers densely packed with magnetic particles with different diameters (7 μm and 235 μm). The density indicated that voids were created at volume fractions of magnetic particles above 0.47 (87 wt%) for 7 μm and 0.44 (85 wt%) for 235 μm.
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