TY - GEN
T1 - Self-healing polymer coatings
AU - Toohey, K. S.
AU - White, S. R.
AU - Sottos, N. R.
PY - 2005
Y1 - 2005
N2 - Inspired by biological systems in which damage triggers an autonomic healing response, structural polymeric materials have been developed that possess the ability to self-heal. First generation self-healing composites incorporate healing agent filled microcapsules and catalyst particles in an epoxy matrix. Although high healing efficiencies have been achieved using this concept, only a limited supply of healing agent is available. If the same crack were to open again, in general a second healing would not be possible. In this paper, we report on a second generation of self-healing composites that utilize an interconnected microvascular network to flow healing agent throughout the matrix. This concept is applied to heal a coating on a substrate containing a microchannel network. A new protocol is developed for coated networks, which entails testing virgin samples in four-point bending until cracks initiate in the coating. The onset of cracking leads to a distinct load drop and corresponding decrease in the bending stiffness. The sample is then allowed to heal (healing agent from the channels permeates the cracks and interacts with a catalyst suspended in the coating) and is retested. The results from this microvascular system are compared with appropriate controls as well as healing efficiencies of a microcapsule coating system.
AB - Inspired by biological systems in which damage triggers an autonomic healing response, structural polymeric materials have been developed that possess the ability to self-heal. First generation self-healing composites incorporate healing agent filled microcapsules and catalyst particles in an epoxy matrix. Although high healing efficiencies have been achieved using this concept, only a limited supply of healing agent is available. If the same crack were to open again, in general a second healing would not be possible. In this paper, we report on a second generation of self-healing composites that utilize an interconnected microvascular network to flow healing agent throughout the matrix. This concept is applied to heal a coating on a substrate containing a microchannel network. A new protocol is developed for coated networks, which entails testing virgin samples in four-point bending until cracks initiate in the coating. The onset of cracking leads to a distinct load drop and corresponding decrease in the bending stiffness. The sample is then allowed to heal (healing agent from the channels permeates the cracks and interacts with a catalyst suspended in the coating) and is retested. The results from this microvascular system are compared with appropriate controls as well as healing efficiencies of a microcapsule coating system.
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M3 - Conference contribution
AN - SCOPUS:32044461793
SN - 0912053909
SN - 9780912053905
T3 - Proceedings of the 2005 SEM Annual Conference and Exposition on Experimental and Applied Mechanics
SP - 241
EP - 244
BT - Proceedings of the 2005 SEM Annual Conference and Exposition on Experimental and Applied Mechanics
T2 - 2005 SEM Annual Conference and Exposition on Experimental and Applied Mechanics
Y2 - 7 June 2005 through 9 June 2005
ER -