Pan Changou, Song Yibo, Liu Peng
State Key Laboratory of Applied Organic Chemistry and Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
ACS Appl Mater Interfaces. 2021 Jun 9;13(22):26498-26504. doi: 10.1021/acsami.1c04939. Epub 2021 May 25.
Amphiphobic surfaces have been developed for various applications. However, the harsh construction conditions and multistep processes limit their practical application. Especially for those with a particular surface roughness and morphology, the amphiphobic property might provide a slight deformation. Here, a facile large-area construction of transparent and flexible amphiphobic coatings with excellent fold resistance has been established by simple casting of the fluorinated liquid nitrile-butadiene rubber (F-LNBR) followed by solvent-free photocuring. It was found that the fluorocarbon groups could concentrate onto the coating surface during the UV-induced photocuring. With a certain coating amount, a stable oleophobic coating was achieved with static contact angles of about 95° and 111° for nonpolar oil (-hexadecane) and polar oil (diiodomethane). Most importantly, the static contact angles of water and diiodomethane of the amphiphobic coatings on the iron sheet increased after bending and remained around 131° and 120° after being completely folded in half for 100 cycles because the inner fluorocarbon groups could be squeezed out from the flexible cross-linked rubber matrix as a reservoir. Such features indicated the promising self-cleaning and surface protection of the proposed transparent and flexible amphiphobic coatings for deformable substrates.
两疏表面已被开发用于各种应用。然而，苛刻的构建条件和多步工艺限制了它们的实际应用。特别是对于那些具有特定表面粗糙度和形态的两疏表面，其两疏性能可能会出现轻微变形。在此，通过简单浇铸氟化液态丁腈橡胶（F-LNBR）然后进行无溶剂光固化，实现了具有优异抗折叠性的透明且柔性两疏涂层的简便大面积构建。研究发现，在紫外线诱导的光固化过程中，氟碳基团能够集中在涂层表面。在一定的涂层量下，对于非极性油（正十六烷）和极性油（二碘甲烷），分别获得了静态接触角约为95°和111°的稳定疏油涂层。最重要的是，铁片上两疏涂层的水和二碘甲烷的静态接触角在弯曲后增大，并且在完全对折100次循环后仍保持在131°和120°左右，这是因为内部的氟碳基团可以从作为储存库的柔性交联橡胶基体中挤出。这些特性表明所提出的用于可变形基材的透明且柔性两疏涂层具有良好的自清洁和表面保护前景。
