121st General Meeting of the KCS

Type Symposium
Area Recent Trends in Self-healing Polymers and Composites
Room No. Room 301
Time FRI 10:00-:
Code POLY2-3
Subject Microcapsule-based self-healing protective coatings
Authors Chan-Moon Chung*, Dong-Min Kim, YUJIN CHO
Department of Chemistry, Yonsei University, Korea
Abstract A protective coating is used to protect surface of a material from various deterioration factors. When the protective coating is damaged by microcracking or scratching, water, chloride ion, and carbon dioxide would penetrate through damaged holes. This results in deterioration of the material, leading to significant reduction in their serviceability. If the protective coating can automatically heal the damaged region, reduced maintenance cost and enhanced public safety can be achieved. We have developed microcapsule-based self-healing protective coating systems for concrete or metal. Healing-agent-loaded microcapsules are prepared and embedded in a coating matrix to obtain a self-healing protective coating. When the capsules are ruptured by damage, the healing agent is released from the ruptured capsules, and fills the damaged region which then undergoes a healing reaction. Sunlight-induced self-healing was accomplished using a methacryloxypropyl-terminated polydimethylsiloxane healing agent and a photoinitiator. A cinnnamide moiety-containing polydimethylsiloxane healing agent was prepared and used to develop a microcapsule-type repeatable self-healing coating system. The self-healing capability of a protective coating by atmospheric moisture was demonstrated by the usage of isophorone diisocyanate healing agent. Organogel was utilized to develop a microcapsule-based self-healing system in which secondary damage does not occur in the healed region. Low-temperature self-healing of a protective coating was demonstrated using a combination of a silanol-terminated polydimethylsiloxane as a healing agent and dibutyltin dilaurate as a catalyst.
E-mail cmchung@yonsei.ac.kr