Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 19, Issue 9, Pages 1399-1405Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200801824
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Funding
- Air Force Office of Scientific Research Multidisciplinary University Research Initiative [F49550-05-10346]
- Beckman Institute for Advanced Science and Technology Graduate Fellows Program
- NSF Graduate Student Fellowship
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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 a mine-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.
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