▎ 摘　　要

In order to expand the application of magnetorheological elastomers (MREs) in the field of sensor technology and improve their dielectric properties, a type of MRE with modified graphene, graphene/silicone rubber-based magnetorheological elastomer (GR/RTV-MRE), is proposed and its dielectric sensing properties were investigated. A model for calculating the relative permittivity of MRE was developed and combined with VASP software simulation to obtain the relative permittivity of GR/RTV-MRE with different graphene contents. Combining the silicone rubber matrix with 30 vol% micro-sized (ca 3.5 mu m) spherical carbonyl iron particles, GR/RTV-MRE samples with different graphene contents were prepared and tested for their relative permittivity. There is an error of approximate 7% between the test results and the simulation results, and the relative permittivity of GR/RTV-MRE with a graphene content of 3 vol% reaches a maximum value of 35.400. An experimental platform for compressive properties was constructed and the compressive modulus of GR/RTV-MRE with a graphene content of 3 vol% was tested under a magnetic field of 0-1 T. The results show that the modulus of compressibility is positively correlated with the magnetic field intensity in the range 0-0.9 T, up to 3.98 MPa, and is almost constant in the range 0.9-1 T. GR/RTV-MRE with a graphene content of 3 vol% was used as the dielectric of a capacitive type transducer. The sensitivity of the capacitive sensor was measured to be 0.07 kPa(-1) with a linear fitting of 99.6%. It is shown that GR/RTV-MRE with 3 vol% graphene has good dielectric sensing capability. (c) 2022 Society of Industrial Chemistry.