Effects of magnetic particle concentration on magneto-mechanical bending of vitrimer composite micropillar arrays
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초록
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Vitrimers exhibit outstanding mechanical performances in comparison with thermoplastic polymers and reprocessability via exchange reaction of covalent adaptive networks. In this study, we synthesized magnetic micropillar arrays by embedding hard magnetic particles into epoxy vitrimer that can facilitate magnetization of the composites. By applying an external magnetic field, magneto-mechanical bending actuation is achieved for the micropillar arrays. We discuss the influence of magnetization and mechanical properties on the bending deformation of the magnetic vitrimer composites depending on the concentration of magnetic particles. Through the investigation of structure-property relationship, we identified an optimum magnetic particle concentration which can maximize the magneto-mechanical bending of micropillar arrays. Finally, we demonstrate shape retention of bent micropillar arrays via dynamic covalent bonding of vitrimer.