The giant reduction of the barrier properties due to self-healing microcapsules and the lack of real-time protection during the healing remained the main challenges in self-healing anticorrosion coatings. Herein, a facile strategy using Janus graphene oxide (GO) as a dense and flexible shell has been proposed to synergistically solve these challenges. Benzotriazole (BTA) was used to synthesize Janus GO at the oil–water interface, and Janus GO/BTA/poly(methyl methacrylate) microcapsules were prepared. Energy-dispersive X-ray spectroscopy, Fourier infrared spectroscopy, Raman spectroscopy, and ultraviolet spectrophotometer analysis confirmed the formation of a Janus GO structure with one surface hydrophilic and the other hydrophobic. The surface morphology of J-GO-capsules with a high GO coverage rate was observed by scanning electron microscopy. The high biobased content coating containing J-GO-capsules showed a low-frequency impedance value above 10¹⁰ as assessed by electrochemical impedance spectroscopy after being immersed in 3.5 wt % NaCl solution for 60 days. In addition, the low-frequency impedance values of the coating were maintained after being scratched due to the self-healing properties of the J-GO-capsules as well as the real-time protective effect of the BTA. Biobased coatings with the best overall properties among all of the self-healing anticorrosion coatings were prepared.

中文翻译：

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Janus GO/BTA/PMMA 微胶囊用于超高性能生物基自修复防腐涂料


自修复微胶囊导致的阻隔性能大幅下降以及修复过程中缺乏实时保护仍然是自修复防腐涂料面临的主要挑战。在此，提出了一种使用 Janus 氧化石墨烯（GO）作为致密且灵活的壳的简单策略来协同解决这些挑战。采用苯并三唑（BTA）在油水界面合成Janus GO，制备了Janus GO/BTA/聚甲基丙烯酸甲酯微胶囊。能量色散X射线光谱、傅里叶红外光谱、拉曼光谱和紫外分光光度计分析证实了Janus GO结构的形成，其一个表面亲水，另一个表面疏水。通过扫描电子显微镜观察具有高GO覆盖率的J-GO胶囊的表面形貌。含有J-GO胶囊的高生物基含量涂层在浸入3.5重量% NaCl溶液60天后通过电化学阻抗谱评估显示出高于10 ^{10 的}低频阻抗值。此外，由于J-GO胶囊的自愈特性以及BTA的实时保护作用，涂层在被划伤后仍能保持低频阻抗值。制备了所有自修复防腐涂料中综合性能最好的生物基涂料。