Surface modification of carbonyl iron particles using dopamine and silane coupling agent for high-performance magnetorheological elastomers. (February 2023)

• Record Type: Journal Article
• Authors: Zhao, Jiaqing; Li, Dongliang; Sun, Baojie; Jiang, Liang; Zhou, Yanfen; Wen, Shipeng; Jerrams, Stephen; Ma, Jianwei; Chen, Shaojuan
• Is Part Of: Polymer testing. Volume 119(2023)
• Publication Date: 2023-02
• Subjects: Magnetorheological elastomers -- Carbonyl iron -- Polydopamine -- n-dodecyltrimethoxysilane -- Viscoelastic properties; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2023.107935
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: Magnetorheological elastomers (MREs) are smart materials whose mechanical properties can quickly respond to changes in the external magnetic field. This phenomenon is known as the magnetorheological (MR) effect and is the key to the application of magnetorheological elastomers. Previous studies have found that the interface between magnetic particles and elastomers is a critical factor that influencing the MR effect of MREs. To improve the interfacial interaction between silicone rubber (SR) and carbonyl iron (CI) particles, in the MREs considered in this work, CI particles were subjected to surface modification through polydopamine (PDA) deposition and n-dodecyltrimethoxysilane (DTMS) grafting. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed the successful deposition of PDA@DTMS coating layer with a thickness of about 30.6 nm. The tensile strength of anisotropic MREs increased by 31.5% after surface modification of CI particles. The study of magnetic field induced changes in viscoelastic properties showed that CI-PDA@DTMS based MREs exhibited a superior MR effect to the CI-based MREs. Highlights: Carbonyl iron (CI) particles were modified by polydopamine and n-dodecyltrimethoxysilane. Surface modification improved the dispersibility of CI in silicone rubber. The mechanical properties of the MREs were enhanced through CI modification. MREs with surface modified CI exhibited a superior magnetorheological effect.