首先用共沉法(不使用表面剂)制备稳定的Fe_3O_4磁流变流体,并用X-射线衍射、透射电子显微镜和振动试样磁力计表征。在稳定的Fe_3O_4磁流变流体中进一步聚合聚氨酯弹性体。另外,研究了Fe_3O_4用量对聚氨酯弹性体力学性能、磁性能、热性能、电性能和微波吸收性能的影响。结果表明:合成工艺 The co-precipitation method (without surface agent) was used to prepare the stable Fe_3O_4 magnetorheological fluid and characterized by X-ray diffraction, transmission electron microscopy and vibrational sample magnetometer. Polyurethane elastomers were further polymerized in a stable Fe_3O_4 magnetorheological fluid. In addition, the effects of Fe 3 O 4 dosage on mechanical properties, magnetic properties, thermal properties, electrical properties and microwave absorption properties of polyurethane elastomers were studied. The results show that: the synthesis process