Coupling Agent, Particle Diameter And The Magnetic Field On The Influences Of The Magnetic Rheological Properties Of Magnetorheological Elastomer

As a new branch of magnetorheological smart materials, magnetorheological elastomer is composed of magnetic particles and polymer, overcoming the disadvantages of easy sedimentation and sealed application of magnetorheological fluid. Magnetorheological elastomer exhibits rapidly and reversibly controllable mechanical properties in the presence of external magnetic field, which makes its possess wide application prospects and attracts great attentions of researcher.The preparation methods are the important factors that affect the magnetorheological effect. So this paper investigated the MRE prepared with different additives, magnetic particles and magnetic field respectively, and its microstructure and dynamic performance were analyzed.Start with a two-component RTV silicone rubber and pure iron as raw material, the interface bonding strength of the silane coupling agent KH560and the titanium acid fat coupling agent NDZ-101were compared, and the mechanism was analyzed future. The result shows that, with the same quality, KH560showed the higher interface bonding performance and higher shear strength.The microstructure and dynamic performance of magnetorheological elastomers with different size of carbonyl iron powder were test. The results show that, with the increasing of the particle diameter, the distance of the adjacent particles along the direction increased, and the initial shear modulus Go decreases gradually, and finally reached a constant value, at the same time,△Gmax first increases then decreases. Thus, according to the relationship between the particle diameter and the rheological shear modulus, found that when the particle diameter is74μm, the magnetorheological effect is the highest, up to90.84%.Five magnetorheological elastomers in1~100Hz low frequency pulse magnetic field were prepared, found that, their initial shear modulus Go, saturated magnetic shear modulus△Gmax and magnetorheological effect MReffeet are higher than MRE prepared in DC magnetic field. And the rheology performance related to the frequency of the pulse magnetic field. When the frequency between1~100Hz, with the increase of frequency, the initial shear modulus Go increases gradually, the saturated magnetic shear modulus△Gmax first increases then decreases and when the frequency is25Hz, the magnetorheological effect is the highest, up to63%...