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Surface-initiated self-healing of polymers in aqueous media

  • Author(s): Ahn, BK
  • Lee, DW
  • Israelachvili, JN
  • Waite, JH
  • et al.

Published Web Location

https://doi.org/10.1038/nmat4037Creative Commons Attribution-NonCommercial 4.0 International Public License
Abstract

Polymeric materials that intrinsically heal at damage sites under wet or moist conditions are urgently needed for biomedical and environmental applications1-6. Although hydrogels with self-mending properties have been engineered by means of mussel-inspired metal-chelating catechol-functionalized polymer networks7-10, biological self-healing in wet conditions, as occurs in self-assembled holdfast proteins in mussels and other marine organisms11,12, is generally thought to involve more than reversible metal chelates. Here we demonstrate self-mending in metal-free water of synthetic polyacrylate and polymethacrylate materials that are surface-functionalized with mussel-inspired catechols. Wet self-mending of scission in these polymers is initiated and accelerated by hydrogen bonding between interfacial catechol moieties, and consolidated by the recruitment of other non-covalent interactions contributed by subsurface moieties. The repaired and pristine samples show similar mechanical properties, suggesting that the triggering of complete self-healing is enabled underwater by the formation of extensive catechol-mediated interfacial hydrogen bonds. © 2014 Macmillan Publishers Limited.

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