4D Printing of Thermally\nActivated Self-Healing Shape\nMemory Polyurethanes

Shape\nmemory polyurethanes are polymers with reversible, temporarily\ncross-linked networks that enable them to retain and recover their\noriginal shapes. While shape memory polyurethanes offer many advanced\nfunctionalities and benefits, certain aspects of their production\nand lifecycle pose sustainability concerns. Herein, we fabricated\nshape memory polyurethanes with self-healing properties by incorporating\ndisulfide bonding into the polymer system. We then further developed\nthem as resins for the digital light processing technique, advancing\nthe 4D printing capability of shape memory polyurethanes. Through\nadditive manufacturing, the sustainability of shape memory polyurethanes\nis enhanced by minimizing material waste, optimizing energy efficiency,\nand enabling the production of customized, high-performance components.