Abstract
ABSTRACT The stable Fe3O4 magnetorheological fluids were first prepared by coprecipitation method without using any surfactants and characterized by X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The polyurethane elastomers were further polymerized in the presence of stable Fe3O4 magnetorheological fluids. Furthermore, the effect of Fe3O4 loading on mechanical, magnetic, thermal, electrical, and microwave-absorbing properties of the polyurethane elastomers were systematically investigated. The results indicated that the synthesis process and Fe3O4 loading had great effects on the properties of polyurethane elastomers. A synthesis-based in situ polymerization method using Fe3O4 magnetorheological fluids instead of dry powder could improve the dispersion of Fe3O4 nanoparticles in the polyurethane matrix. The Fe3O4/polyurethane nanocomposites showed high mechanical, magnetic, thermal, electrical, and microwave-absorbing properties at a low loading of 2 wt%, and could potentially be used for a wide range of applications.
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