Magneto-Responsive Shape Fixable Vitrimer Micropillar Arrays

Magneto-responsive materials have been emerged owing to the contactless actuation with untethered system at the room temperature. However, temporary magneto-induced structure disappears after removing external magnetic fields and recovers its original configuration. In this study, we manufactured micropillar arrays with vitrimer matrix embedding magnetic particles to retain magneto-induced temporary shape. We introduced epoxy vitrimer to facilitate dynamic covalent bond via transesterification. We also discuss trade-off relationships between mechanical stiffness and magnetization depending on the concentration of magnetic particles through the investigation of structure-property relationship. The maximum magneto-mechanical bending is obtained with an optimum magnetic particle concentration. Furthermore, we will discuss shape fixation of vitrimer micropillar arrays by magnetically driven thermomechanical stimuli.