Self-healing polyurethane materials based on supramolecular interactions
Polyurethane materials are considered ideal self-healing materials due to their inherent hydrogen bonding structure.It has been found that introduction of supramolecular chemistry into polyurethane can achieve even better performance in self-healing,with most of their physical and chemical properties recovered after damage.Herein,the recent advances in supramolecule-based self-healing polyurethane materials with different healing mechanisms were reviewed,including widely used hydrogen bonding systems,aromatic π-π stacking systems,ion-crosslinked polymer systems with ionic side chains that formed interlocking points,metal-ligand interaction systems that crosslinked materials through coordination of metal ions and ligands,and host-guest interaction systems where macrocyclic molecules interacted with specific sized molecules.Finally,the future development directions of self-healing polyurethane were discussed.
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