Tailoring Performance, Damping, and Surface Properties of Magnetorheological Elastomers via Particle-Grafting Technology

Abstract

A novel concept based on advanced particle-grafting technology to tailor performance, damping, and surface properties of the magnetorheological elastomers (MREs) is introduced. In this work, the carbonyl iron (CI) particles grafted with poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) of two different molecular weights were prepared via surface-initiated atom transfer radical polymerization and the relations between the PHEMATMS chain lengths and the MREs properties were investigated. The results show that the magnetorheological performance and damping capability were remarkably influenced by different interaction between polydimethylsiloxane chains as a matrix and PHEMATMS grafts due to their different length. The MRE containing CI grafted with PHEMATMS of higher molecular weight exhibited a greater plasticizing effect and hence both a higher relative magnetorheological effect and enhanced damping capability were observed. Besides bulk MRE properties, the PHEMATMS modifications influenced also field-induced surface activity of the MRE sheets, which manifested as notable changes in surface roughness.

Magnetorheological Elastomers: Fabrication, Characteristics, and Applications

“…For pure CI, saturation magnetization was 198 Am 2 /kg and CI/PGMA was 153 Am 2 /kg, respectively, confirming that the saturation magnetization is reduced by the coating of PGMA. Figure 6 b is the magnetization curve of CI particles coated with poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) [ 118 ]. It indicated that the saturation magnetization value decreased as the PHEMATMS coating thickness increased from 11 nm to 22 nm.…”

“… ( a ) VSM curves of pure CI (open dark square) particles and PGMA coated CI (open blue circle) particles [ 60 ] and ( b ) magnetization curves of a—bare CI, b—CI-g-PHEMATMS-1 (11 nm), and c—CI-g-PHEMATMS-2 (22 nm) particles obtained via VSM [ 118 ]. …”

Preparation of electrospun magnetic polyvinyl butyral/Fe2O3 nanofibrous membranes for effective removal of iron ions from groundwater

“…[40] Interestingly, research has recently been conducted elsewhere on magnetic elastomers with modified particle/ matrix interaction. [41] Prior to the present study, though, field-induced restructuring of magnetic nanofibers had not been previously explored in this context. Figure 9 shows low-field magnetic susceptibility, plotted as a function of magnetic field strength, for the PVB nanofibrous membranes with various MNP concentrations.…”

Material Characterization of Magnetorheological Elastomers with Corroded Carbonyl Iron Particles: Morphological Images and Field-dependent Viscoelastic Properties

“…Recently, Cvek at al. [23] fabricated two types of CI particles grafted with poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) of two different molecular weights. The results revealed that the PHEMATMS did enhanced the stability of CI particles and prevented the degradation in an acidic condition.…”