Song Young-Kyu, Kim Hyun-Woo, Chung Chan-Moon
Department of Chemistry, Yonsei University, Wonju 26493, Korea.
Polymers (Basel). 2022 May 15;14(10):2013. doi: 10.3390/polym14102013.
Generally, microcapsule-based self-healing materials have the limitation of single local self-healing. A few studies have reported repeatable self-healing in these microcapsular materials, but there is a challenge to develop multi-cycle self-healing materials that have the advantages of easier preparation and a more efficient operation. In this work, a mixture of two vegetable oils, soybean and olive oil, was used as a healing agent. The atmospheric oxygen-induced reaction behavior (in the presence of a catalyst) was investigated for various compositions of the vegetable oil mixtures; infrared spectroscopy, recovery testing, and viscoelasticity measurement were performed to find an optimum composition of the healing agent. Microcapsules loaded with soybean oil and catalyst-containing olive oil were separately prepared and used to prepare a dual-capsule self-healing coating. It was demonstrated through optical and scanning electron microscopy that, upon scribing the self-healing coating, the vegetable oils flowed out from microcapsules to self-heal the damaged area. When the healed area of the self-healing coating was re-scribed, self-healing was repeated, which was confirmed by scanning electron microscopy (SEM) and anticorrosion and electrochemical testing. Our new repeatable self-healing coating provides the merits of easy preparation, no need for external intervention such as light irradiation, and an environmentally-friendly nature.
一般来说，基于微胶囊的自修复材料存在单一局部自修复的局限性。一些研究报道了这些微胶囊材料中的可重复自修复，但开发具有制备更简便、操作更高效优点的多循环自修复材料仍面临挑战。在这项工作中，大豆油和橄榄油这两种植物油的混合物被用作修复剂。针对植物油混合物的各种组成，研究了大气氧诱导的反应行为（在催化剂存在下）；进行了红外光谱、恢复测试和粘弹性测量，以找到修复剂的最佳组成。分别制备了负载大豆油和含催化剂橄榄油的微胶囊，并用于制备双胶囊自修复涂层。通过光学显微镜和扫描电子显微镜表明，在划刻自修复涂层时，植物油从微胶囊中流出以自修复受损区域。当自修复涂层的愈合区域再次被划刻时，自修复得以重复，这通过扫描电子显微镜（SEM）以及防腐和电化学测试得到证实。我们新的可重复自修复涂层具有制备简便、无需光照射等外部干预以及环保的优点。
