Robust and Highly Transparent Photocurable Fluorinated Polyurethane Coating Prepared via Thiol-Click Reactions and What Essentially Influences Omniphobic Coating's Anti-Graffiti Properties
Robust and Highly Transparent Photocurable Fluorinated Polyurethane Coating Prepared via Thiol-Click Reactions and What Essentially Influences Omniphobic Coating's Anti-Graffiti Properties
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DOI：
10.1021/acsapm.2c01311
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发表时间：
2022-10-14
影响因子：
5
通讯作者：
Zhang, Qiuyu
中科院分区：
文献类型：
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作者：
Fu, Kang;Tian, Yi;Zhang, Qiuyu
由于没有脆弱的微/纳米结构，全疏涂层在机械耐久性方面比超全疏涂层具有天然优势，特别是在实际使用中面临手指擦拭和挤压时。许多报道的全疏涂层具有较低的液体滑动角，具有较好的耐油墨痕迹性能。然而，根据我们的结果，这两种性质并不是正相关的。降低液体滑动角和抵抗微小污染物（如油墨笔划和指纹）的关键因素仍然难以捉摸。通过三个步骤的硫醇点击反应，表面干燥，高度透明，机械和化学坚固，氟化聚氨酯涂层被有效地光固化。表面表现出较好的滑动性能，但较差的抗笔划和指纹。我们的研究结果表明，重交联结构有利于抵抗微小污染物，而液体滑动性能仅取决于表面氟含量，特别是柔性低表面张力链的表面富集。有趣的是，在制备过程中观察到从浑浊分散体到透明溶液的意外转变。有效的巯基键合反应诱导胶束状结构打开，并赋予最终涂层高透明度。因此，这项工作为促进全疏涂层的研究提供了有用的信息，并为防涂鸦应用提供了良好的候选材料。
Without a fragile micro/nanostructure, omniphobic coatings have a natural advantage over superomniphobic coatings in mechanical durability, especially when confronted with finger wipes and squeezes in practical use. Many reported omniphobic coatings with lower liquid sliding angles showed better ink trace resistance. However, according to our results, these two properties are not positively related. The respective critical factors for lowering the liquid sliding angle and resisting tiny contaminants, such as ink stroke and fingerprint, remain elusive. Through three steps of the thiol-click reaction, a surface-dried, highly transparent, mechanically and chemically robust, fluorinated polyurethane coating was photocured efficiently. Surfaces that exhibited better sliding performance but worse resistance to ink stroke and fingerprint were reported. Our results indicate that a heavy cross-linked structure was beneficial for the resistance to tiny contaminants, while the liquid sliding performance only depended on the surface fluorine content, especially the surface enrichment of flexible low-surface-tension chains. Interestingly, an unexpected transformation from a turbid dispersion to a transparent solution during the preparation was observed. The efficient thiol-click reaction induces a micelle-like structure to open and imparts high transparency to the final coatings. Therefore, this work provides useful information to facilitate the study of omniphobic coatings, as well as a good candidate in anti-graffiti applications.