Delivery of two-part self-healing chemistry via microvascular networks

Kathleen S. Toohey, Christopher J. Hansen, Jennifer A. Lewis, Scott R. White, Nancy R. Sottos

Research output: Contribution to journalArticlepeer-review


Multiple healing cycles of a single crack in a brittle polymer coating are achieved by microvascular delivery of a two-part, epoxy-based self-healing chemistry. Epoxy resin and amine-based curing agents are transported to the crack plane through two sets of independent vascular networks embedded within a ductile polymer substrate beneath the coating. The two reactive components remain isolated and stable in the vascular networks until crack formation occurs in the coating under a mechanical load. Both healing components are wicked by capillary forces into the crack plane, where they react and effectively bond the crack faces closed. Healing efficiencies of over 60% are achieved for up to 16 intermittent healing cycles of a single crack, which represents a significant improvement over systems in which a single monomeric healing agent is delivered.

Original languageEnglish (US)
Pages (from-to)1399-1405
Number of pages7
JournalAdvanced Functional Materials
Issue number9
StatePublished - May 8 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials


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