A high-performance magnetorheological material: preparation, characterization and magnetic-mechanic coupling properties

Abstract

A novel high-performance magnetorheological material, named as magnetorheological plastomer (MRP), was developed by dispersing iron particles into a plastic polyurethane (PU) matrix. The dynamic properties (including storage modulus and loss factor) of the MRP material were systematically tested and the influences of the iron particle content and magnetic field were analyzed. It is found that the anisotropic MRP product with 80% iron particle weight fraction (A-MRP-80), shows a high dynamic property: the maximum magneto-induced storage modulus is 6.54 MPa; the relative MR effect reaches as high as 532%; the loss factor can be reduced to 0.03 by adjusting magnetic field. This kind of MRP shows a much higher magnetorheological performance than the previously reported magnetorhelogical elastomer (MRE). The mechanism for its high MR performance was proposed and the influence of the iron particle distribution and temperature on the dynamic properties were discussed.

Magneto-induced normal stress of magnetorheological plastomer

“…Test sample was polyurethane based MRP with 70 wt.% carbonyl iron particle (type CIP-CN, produced by BASF, Germany) which is prepared using the same method as was used in our previous work. 1 A commercial rheometer (type Physica MCR 301, produced by Anton Paar GmbH, Austria) with a magneto-controllable accessory (type MRD180) was used to test magneto-induced normal force. The test sample was imposed to the gap of upper plate (type PP20/MRD) and base bed, with parallel gap fixed as 1.000 mm to confine the vertical strain of test sample.…”

“…1, 2 MRP appears to be an interphase between magnetorheological fluid 3 and magnetorheological elastomer. 4 In the absence of external magnetic field the iron particles cannot move in the plastic matrix, but they can arrange or rearrange to form some chain-like microstructures along an applied magnetic field.…”

“…This versatile characteristic makes MRP show a much higher magnetorheological effect than magnetorheological elastomer. 1 Except for novel performance in rheology, MRP can also overcome the headache particle sedimentation problem 5 of magnetorheological fluid.…”

Physicochemical Properties and Stress-Strain Compression Behaviors of a Waste based Magnetorheological Elastomers

“…Thermal analyses such as Di erential Scanning Calorimetry (DSC), thermogravimetric analysis (TGA/DTA), Dynamic Mechanical-Thermal Analysis (DMTA), aging test, thermal oxidation, and UV oxidation are usually conducted to investigate the performance of the elastomeric materials including MREs as their response to thermal loads. The studies on thermal ans of the MREs based on virgin rubber and/or saturated elastomers can be found in some previous works [27,41,57,[79][80][81][82]. However, since the specimens studied in this report are made of waste rubber as the MREs matrix, there is no report that precisely explains their stability and degradation.…”

Conducting poly(N-methylaniline)-coated cross-linked poly(methyl methacrylate) nanoparticle suspension and its steady shear response under electric fields

“…They can be used in shock absorbers [12], damper systems [13], microfluidics [14], and tactile displays [15] along with magnetically analogous magnetorheological (MR) fluids under external magnetic fields [16]. However, the application of ER fluids is not as successful as the case of MR fluids in general owing to their relatively lower yield stress compared to MR fluids, except giant ER fluids [17,18].…”