Electrophysical and Acoustic Properties of Magnetic Elastomers Structured by an External Magnetic Field

摘要

Magnetoactive elastomers are promising for use in designing of magnetically operated devices for signal processing and sensors. The results from studying the electrophysical and acoustic properties of new magnetoactive elastomers structured by a nonuniform magnetic field are presented. It is shown that the prestructuring of the magnetic disperse filler by a magnetic field during composite synthesis substantially improves the coefficient of the transmission of electromagnetic radiation through the sample. The effect gets stronger as the mass fraction of filler increases. As the filler concentration grows, the transmission coefficient falls by 50%, and the ref lection coefficient grows by a factor of 150%. The longitudinal elastic modulus and the density vary within the ranges of 1.4-1.8 GPa and 2485-3362 kg m~(-3), respectively, depending on the magnetic filler concentration and the sample's structuring. The obtained results demonstrate the potential of usinf structured magnetoactive elastomers as radar absorbing materials.