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Microcapsule-Type Self-Healing Protective Coating for Cementitious Composites with Secondary Crack Preventing Ability

1
Department of Chemistry, Yonsei University, Wonju, Gangwon-do 26493, Korea
2
Department of Civil and Environmental Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Nele De Belie
Materials 2017, 10(2), 114; https://doi.org/10.3390/ma10020114
Received: 28 November 2016 / Accepted: 24 January 2017 / Published: 26 January 2017
(This article belongs to the Special Issue Self-Healing Concrete)
A microcapsule-type self-healing protective coating with secondary crack preventing capability has been developed using a silanol-terminated polydimethylsiloxane (STP)/dibutyltin dilaurate (DD) healing agent. STP undergoes condensation reaction in the presence of DD to give a viscoelastic substance. STP- and DD-containing microcapsules were prepared by in-situ polymerization and interfacial polymerization methods, respectively. The microcapsules were characterized by Fourier-transform infrared (FT-IR) spectroscopy, optical microscopy, and scanning electron microscopy (SEM). The microcapsules were integrated into commercial enamel paint or epoxy coating formulations, which were applied on silicon wafers, steel panels, and mortar specimens to make dual-capsule self-healing protective coatings. When the STP/DD-based coating was scratched, self-healing of the damaged region occurred, which was demonstrated by SEM, electrochemical test, and water permeability test. It was also confirmed that secondary crack did not occur in the healed region upon application of vigorous vibration to the self-healing coating. View Full-Text
Keywords: microcapsule; self-healing protective coating; secondary crack prevention; cementitious materials microcapsule; self-healing protective coating; secondary crack prevention; cementitious materials
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MDPI and ACS Style

Kim, D.-M.; Yu, H.-C.; Yang, H.-I.; Cho, Y.-J.; Lee, K.-M.; Chung, C.-M. Microcapsule-Type Self-Healing Protective Coating for Cementitious Composites with Secondary Crack Preventing Ability. Materials 2017, 10, 114.

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