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Magnetic polyurethane elastomers with wide range modulation of elasticity

von Dr. Tetsu Mitsumata, Suguru Ohori

A new magnetorheological elastomer that demonstrates drastic and reversible changes in dynamic modulus in air was obtained. the magnetic elastomer consists of polyurethane and carbonyl iron particles. the magnetic elastomer with a volume fraction of 0.29 exhibited a reversible increase by factors of 277 of the storage modulus and 96 of the loss modulus upon a magnetic field of 500 mt. the elastomer underwent high mechanical toughness with a braking strain exceeding 0.8, and demonstrates the giant magnetorheological behavior for half year after the synthesis without degradation.