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Facile fabrication of biomimetic superoleophobic composite coating via Schiff base reaction and self-assembly
Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.porgcoat.2020.105568
Guolin Zheng , Dan Zhang , Chuang Zheng , Yajuan Yao , Zhu Long

Abstract Inspired by the defects of superoleophobic surface with poor friction resistance and the complicated preparation method, the bio-dopamine was utilized and the friction-durable superoleophobic composite coating was successfully obtained via Schiff base reaction and self-assembly. Dopamine contains the phenolic hydroxyl groups that can react with an amine group or a thiol group. Polydopamine is formed via dopamine self-polymerization under aerobic and weakly alkaline conditions. Additionally, polydopamine can adhere to the surface of virtually all materials. First, the self-polymerization of folic acid induced dopamine to form polydopamine micro-nanoparticles under weakly alkaline conditions. Second, 3,5-Bis(trifluoromethyl)aniline reacted with the phenolic hydroxyl groups of polydopamine nanoparticles via Schiff base reaction. Ammonium hexafluorosilicate was adsorbed on the surface of polydopamine microspheres via electrostatic interactions. Then, the self-assembly behavior of fs-81 and fs-63 with ammonium hexafluorosilicate occurred on polydopamine nanoparticles via electrostatic interactions. Accordingly, the surface roughness was further increased, for which the limitation of traditional methods of using additional nanoparticles to construct hierarchical rough surface was broken. Eventually, the superoleophobic composite coating was applied to the surface of cotton fabric. The results showed that the contact angles of the cotton fabric surface with edible oil, ethylene glycol and glycerol were greater than 150° in the air, respectively, after two cycles of self-assembly modification. The contact angles between the cotton fabric surface and edible oil droplets were still greater than 150°after 25 mechanical abrasion cycles. In addition, the surface free energy of cotton fabric was decreased by 64.1 % after finishing the coating.

中文翻译:

通过席夫碱反应和自组装轻松制造仿生超疏油复合涂层

摘要 针对超疏油表面摩擦阻力差和制备方法复杂的缺陷,利用生物多巴胺,通过席夫碱反应和自组装成功获得了耐摩擦超疏油复合涂层。多巴胺含有可与胺基或硫醇基反应的酚羟基。聚多巴胺是在有氧和弱碱性条件下通过多巴胺自聚合形成的。此外,聚多巴胺几乎可以粘附在所有材料的表面。首先,在弱碱性条件下,叶酸的自聚合诱导多巴胺形成聚多巴胺微纳米颗粒。其次,3,5-双(三氟甲基)苯胺通过席夫碱反应与聚多巴胺纳米颗粒的酚羟基反应。六氟硅酸铵通过静电相互作用吸附在聚多巴胺微球表面。然后,fs-81 和 fs-63 与六氟硅酸铵的自组装行为通过静电相互作用发生在聚多巴胺纳米颗粒上。因此,表面粗糙度进一步增加,打破了传统方法使用额外的纳米粒子来构建分级粗糙表面的局限性。最后,将超疏油复合涂层涂覆在棉织物表面。结果表明,经过2个循环的自组装改性后,棉织物表面与食用油、乙二醇和甘油在空气中的接触角分别大于150°。经过25次机械磨损循环后,棉织物表面与食用油滴的接触角仍大于150°。此外,涂层整理后棉织物的表面自由能降低了64.1%。
更新日期:2020-05-01
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