Fluorine‐Free Superhydrophobic Coatings: Rapid Fabrication and Highly Efficient Oil/Water Separation,Macromolecular Materials and Engineering

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Fluorine‐Free Superhydrophobic Coatings: Rapid Fabrication and Highly Efficient Oil/Water Separation
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-09-23 , DOI: 10.1002/mame.202000400
Ítalo G. M. da Silva _{1,

2} , Elizabete F. Lucas ₃ , Rigoberto Advincula _{1,

4}

Affiliation

In this work, a rapid method is demonstrated to obtain a fluorine‐free superhydrophobic/superoleophilic coating by a simple two‐step method: dip‐coating and oven curing. The chemical structure of the coating is based on the crosslinking reaction of an alkyl methacrylate, a dimethacrylate (crosslinker) and a silane (adhesive), using AIBN as initiator, toluene as solvent, and silica nanoparticles to enhance surface roughness. Chemorheology results show that the coating is fully cured even in 20 min at 100 °C, exhibiting a water contact angle (CA) of 162 ± 2°, sliding angle (SA) of 4 ± 1°, nanometrical structures throughout the surface, and excellent adhesion properties for the mesh screen. The coating exhibits outstanding oil/water separation efficiency (96–99%) for seven different types of oil (gasoline, diesel, petroleum ether, hexane, toluene, chloroform, and dichloromethane), and in addition presents high recyclability. Based on nonisothermal TGA, the activation energy of degradation, calculated using the Kissinger and Ozawa models, is 113.5 and 114 kJ mol^‐1, respectively. Finally, the coating is thermally aged at 150 °C: the CA exhibits a smooth decrease up to 129 ± 1° at 120 min, and FTIR analysis shows structural changes possibly related to the generation of thermal oxidation products.

中文翻译：

无氟超疏水涂层：快速制造和高效油/水分离

在这项工作中，演示了一种快速方法，该方法可通过简单的两步法获得无氟的超疏水/超亲油涂层：浸涂和烤箱固化。涂层的化学结构基于甲基丙烯酸烷基酯，二甲基丙烯酸酯（交联剂）和硅烷（胶粘剂）的交联反应，使用AIBN作为引发剂，甲苯作为溶剂，以及二氧化硅纳米颗粒以提高表面粗糙度。化学流变学结果表明，即使在100°C下20分钟，涂层也能完全固化，水接触角（CA）为162±2°，滑动角（SA）为4±1°，整个表面均具有纳米结构，并且筛网具有出色的附着力。该涂层对七种不同类型的油（汽油，柴油，石油醚，己烷，甲苯，氯仿和二氯甲烷），此外还具有很高的可回收性。基于非等温TGA，使用基辛格和小泽模型计算的降解活化能为113.5和114 kJ mol^‐1。最后，将涂层在150°C的温度下进行热时效：CA在120分钟内显示出高达129±1°的平滑下降，并且FTIR分析表明结构变化可能与热氧化产物的产生有关。

更新日期：2020-09-23

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