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.
Highlights
Magnetorheological elastomers (MREs) have attracted much attention in scientific as well as industrial fields due to their rapidly-tunable viscoelastic properties once they are exposed to an external magnetic field
The magnetorheological elastomers (MREs) represent composite systems comprising the ferromagnetic particles embedded in an elastomeric matrix they can be perceived as solid analogues to the magnetorheological fluids (MRFs) [1]
In our previous study [26], we have shown that the carbonyl iron (CI) particles covalently grafted with poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) chains (CI-g-PHEMATMS) via surfaceinitiated atom transfer radical polymerization (SI-ATRP) exhibited high thermo-oxidation stability, excellent chemical stability, enhanced dispersibility and significant wettability with PDMS matrix
Summary
Magnetorheological elastomers (MREs) have attracted much attention in scientific as well as industrial fields due to their rapidly-tunable viscoelastic properties once they are exposed to an external magnetic field. High stability and tunable viscoelastic moduli changes make the MREs suitable materials for the applications such as vibration absorbers, adaptive dampers, or stiffness tunable mounts [7,8,9,10]. Pioneer applications such as artificial muscles [11], micro-fluid transport systems [12], radio-absorbers [13], sensors [14], or active elements of electric circuits [15] based on the MREs concept have been reported
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