Structural colors originating from melanin in nature have attracted great attention in recent years. Structural colorization is an eco-friendly dyeing method which may be a substitute of the traditional highly polluting dyeing method. In this study, the structural color originating from biomimetic melanin-like polydopamine (PDA) nanofilm coating on flexible silk fabric and its color performance have been studied. Five different bright structural colors were obtained through the different polymerization reaction time of PDA nanofilm coating. However, the prepared structural colors nanofilm coating exist cracking and poor colorfastness due to the capillary tension during the formation of PDA film and the weak interaction with fabric substrate. P(GMA-co-PEGMA) copolymer containing reactive epoxy groups was used to improve the interface bonding strength between PDA film and substrate by forming covalent bond. The introducing covalent bond will be beneficial for the improving interface bonding strength, thus to obtain high colorfastness structural color coating. This research would provide experimental basis for the fabrication of crack-free and high colorfastness structural color coating originating from biomimetic melanin-like PDA nanofilm which would achieve the application in textile colorization.

近年来，自然界中源自黑色素的结构色引起了极大的关注。结构染色是一种生态友好的染色方法，可以替代传统的高污染染色方法。在这项研究中，研究了仿生黑色素样聚多巴胺（PDA）纳米膜在柔性丝织物上的结构色及其色彩表现。通过PDA纳米膜涂层的不同聚合反应时间获得了五种不同的亮结构色。然而，由于在PDA膜的形成过程中的毛细张力以及与织物基质的弱相互作用，所制备的结构色纳米膜涂层存在开裂和差的色牢度。使用含有反应性环氧基的P（GMA-co-PEGMA）共聚物通过形成共价键来提高PDA膜与基材之间的界面结合强度。引入共价键将有利于提高界面键合强度，从而获得高的色牢度结构彩色涂料。该研究为仿生黑色素样PDA纳米膜的无裂纹，高色牢度结构彩色涂料的制备提供了实验依据，并将其应用于纺织品的着色。