TY - JOUR
T1 - Delivery of two-part self-healing chemistry via microvascular networks
AU - Toohey, Kathleen S.
AU - Hansen, Christopher J.
AU - Lewis, Jennifer A
AU - White, Scott R.
AU - Sottos, Nancy R.
PY - 2009/5/8
Y1 - 2009/5/8
N2 - 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.
AB - 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.
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U2 - 10.1002/adfm.200801824
DO - 10.1002/adfm.200801824
M3 - Article
AN - SCOPUS:66149147870
SN - 1616-301X
VL - 19
SP - 1399
EP - 1405
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 9
ER -