Shape Fixation of Magneto-Mechanically Deformed Micropillar Arrays via Dynamic Covalent Bonds
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Polymeric micropillar arrays containing magnetic particles have demonstrated the ability to undergo contactless and programmable shape reconfiguration when an external magnetic field is applied. However, the magnetically reconfigured shape is temporary and reverts to its original geometry upon the removal of the magnetic field. Herein, we employed vitrimer as matrix of magnetic composites to achieve shape-fixation of the actuated geometry via dynamic covalent bonds. The magnetic deformation was accomplished by containing hard magnetic particles at various concentrations in the magnetic composites. We discuss concentration effects of magnetic particles on structure-property relationships and suggest optimum concentration of magnetic particles for maximizing the magnetic deformation of the micropillars. Finally, we will demonstrate the thermomechanical shape-fixation of magnetically actuated micropillars by constructing new chemical networks with adjacent micropillars via dynamic covalent bonds.