Kim Dong-Min, Yu Hwan-Chul, Yang Hye-In, Cho Yu-Jin, Lee Kwang-Myong, Chung Chan-Moon
Department of Chemistry, Yonsei University, Wonju, Gangwon-do 26493, Korea.
Department of Civil and Environmental Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Korea.
Materials (Basel). 2017 Jan 26;10(2):114. doi: 10.3390/ma10020114.
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.
使用硅醇封端的聚二甲基硅氧烷（STP）/二月桂酸二丁基锡（DD）愈合剂开发了一种具有防止二次开裂能力的微胶囊型自修复保护涂层。STP在DD存在下发生缩合反应，生成一种粘弹性物质。分别通过原位聚合法和界面聚合法制备了含STP和DD的微胶囊。通过傅里叶变换红外（FT-IR）光谱、光学显微镜和扫描电子显微镜（SEM）对微胶囊进行了表征。将微胶囊整合到商用搪瓷漆或环氧涂料配方中，涂覆在硅片、钢板和砂浆试件上，制成双胶囊自修复保护涂层。当基于STP/DD的涂层被划伤时，受损区域发生自修复，这通过SEM、电化学测试和水渗透性测试得到了证明。还证实，在对自修复涂层施加剧烈振动时，愈合区域未出现二次裂纹。
