Self-healing hyperbranched poly(aroyltriazole)s

The research on self-healing polymers has been a hot topic. The encapsulated-monomer/catalyst, supramolecular self-assembly and reversible or dynamic covalent bond formation are the prevailingly adopted strategies. The alternative of irreversible covalent bond formation is, however, to be further developed. In this contribution, self-healing hyperbranched poly(aroyltriazole)s of PI and PII sharing such mechanism were developed. The polymers were synthesized by our developed metal-free click polymerizations of bis(aroylacetylene)s and triazide. They are processible and have excellent film-forming ability. High quality homogeneous films and sticks free from defects could be obtained by casting. The scratched films could be self-repaired upon general heating. The cut films and sticks could be healed by stacking or pressing the halves together at elevated temperature. Thus, these hyperbranched polymers could find broad applications in diverse areas and our design concept for self-healing materials should be generally applicable to other hyperbranched polymers with reactive groups on their peripheries.