Cao Lin, Wang Qi, Wang Wei, Li Qiyuan, Chen Shougang
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China.
ACS Appl Mater Interfaces. 2022 Jun 15;14(23):27168-27176. doi: 10.1021/acsami.2c05048. Epub 2022 Jun 6.
Organic protective coatings are widely used to protect metal structures from corrosion but they are vulnerable to undetectable damage. Without timely detection and repair, it could lead to severe consequences. How to warn and heal damaged areas simultaneously and automatically has become a challenging problem. Herein, we report an intelligent protective coating with self-warning and self-healing functions. This strategy was achieved by embedding bifunctional nanofibers containing 1,10-phenanthroline (Phen) in organic coatings. The nanofibers with Phen as a core and a poly(vinyl alcohol) (PVA)─chitosan (CS) blend solution as a shell were synthesized by coaxial electrospinning. The PVA/CS@Phen nanofiber-embedded coating displayed self-healing and high contrast indication function of the damaged area on coatings. Prominent red could warn microdamage and macrosurface damage, which occurred rapidly and healed permanently. The intelligent coating exhibited high healing performance under artificial injury with self-warning characteristics, and the cure rate was about 98.4% without external intervention. In the healing process, free amino groups of CS in the shell of nanofibers enhanced the sustained release of Phen. This convenient, economical, and efficient strategy with cooperative functions of self-warning and self-healing delivers an effective solution for prolonging the service life of protective coatings. This multifunctional coating exhibits excellent potential in the field of marine engineering applications.
有机防护涂层被广泛用于保护金属结构免受腐蚀，但它们容易受到难以察觉的损伤。如果不及时检测和修复，可能会导致严重后果。如何同时自动地对受损区域进行预警和修复已成为一个具有挑战性的问题。在此，我们报道了一种具有自我预警和自我修复功能的智能防护涂层。该策略是通过将含有1,10-菲啰啉（Phen）的双功能纳米纤维嵌入有机涂层中来实现的。以Phen为核、聚乙烯醇（PVA）-壳聚糖（CS）共混溶液为壳的纳米纤维通过同轴静电纺丝合成。嵌入PVA/CS@Phen纳米纤维的涂层表现出对涂层受损区域的自我修复和高对比度指示功能。显著的红色能够对微观损伤和宏观表面损伤进行预警，损伤发生迅速且能永久修复。该智能涂层在人工损伤下表现出具有自我预警特性的高修复性能，在无外部干预的情况下治愈率约为98.4%。在修复过程中，纳米纤维壳层中CS的游离氨基增强了Phen的持续释放。这种具有自我预警和自我修复协同功能的便捷、经济且高效的策略为延长防护涂层的使用寿命提供了有效的解决方案。这种多功能涂层在海洋工程应用领域展现出优异的潜力。
