4D Printing of Thermally Activated Self-Healing Shape Memory Polyurethanes

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