Abstract In the current study, a self-healing coating was prepared by the synthesis of an absorbent copolymeric gel on the surfaces of titanium dioxide (TiO2) and its incorporation into epoxy resin. The preparation of the nanogel composite occurred in two steps; firstly, by using 3-(triethoxysilyl) propyl methacrylate (MPS) and then by the absorbent acrylamide (AAm) and acrylic acid (AA) copolymeric gel. The prepared nanogel composite was then added to the epoxy resin in different loading weight percentages (1, 2, and 4). The chemical structure of the synthesized TiO2 nanogel composite was evaluated using Fourier transform infrared (FTIR), and X-ray diffraction (XRD). In order to investigate the thermal stability and morphology of the nanogel composite thermogravimetric analysis (TGA) and Field Emission Scanning Electron Microscopy (FESEM) were utilized, respectively. The result of the characterization tests verified the successful synthesis of the TiO2 nanogel composite. The efficacy of the incorporation of the TiO2 nanogel composite on the self-healing behavior of the epoxy coatings was assessed in 3.5 wt.% NaCl solution by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The prepared nanogel composite exhibited excellent barrier properties against corrosive media. Functionalized TiO2 nanoparticles were found to noticeably enhance the anticorrosive behavior of the epoxy coating. Furthermore, the results verified the epoxy resin containing 1 wt.% of TiO2 nanogel composite as the most anticorrosive sample with the healing efficiencies of 98 % and 94 % obtained from the EIS and potentiodynamic polarization tests, respectively.

中文翻译：

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通过加入丙烯酸-共聚-丙烯酰胺共聚凝胶开发环氧自修复涂层

摘要 在目前的研究中，通过在二氧化钛 (TiO2) 表面合成吸收性共聚凝胶并将其掺入环氧树脂制备自修复涂层。纳米凝胶复合材料的制备分两步进行；先用甲基丙烯酸3-（三乙氧基甲硅烷基）丙酯（MPS），再用吸水丙烯酰胺（AAm）和丙烯酸（AA）共聚凝胶。然后将制备的纳米凝胶复合材料以不同的负载重量百分比（1、2 和 4）添加到环氧树脂中。使用傅里叶变换红外 (FTIR) 和 X 射线衍射 (XRD) 评估合成的 TiO2 纳米凝胶复合材料的化学结构。为了研究纳米凝胶复合材料热重分析 (TGA) 和场发射扫描电子显微镜 (FESEM) 的热稳定性和形态，分别被利用。表征测试结果验证了TiO2纳米凝胶复合材料的成功合成。通过电化学阻抗谱 (EIS) 和动电位极化，在 3.5 wt.% NaCl 溶液中评估了 TiO2 纳米凝胶复合材料对环氧树脂涂层自修复行为的影响。制备的纳米凝胶复合材料对腐蚀介质表现出优异的阻隔性能。发现官能化的 TiO2 纳米颗粒显着增强了环氧树脂涂层的防腐性能。此外，结果证实了含有 1 重量份的环氧树脂。