Development of an epoxy self-healing coating through the incorporation of acrylic acid-co-acrylamide copolymeric gel
Development of an epoxy self-healing coating through the incorporation of acrylic acid-co-acrylamide copolymeric gel
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DOI：
10.1016/j.porgcoat.2020.105948
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发表时间：
2020-12-01
影响因子：
6.6
通讯作者：
Ramakrishna, Seeram
中科院分区：
文献类型：
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作者：
Ghomi, Erfan Rezvani;Neisiany, Rasoul Esmaeely;Ramakrishna, Seeram
在目前的研究中，通过在二氧化钛（TiO2）表面合成吸收性共聚物凝胶并将其掺入环氧树脂中制备了自修复涂层。纳米凝胶复合材料的制备分两步进行；首先采用甲基丙烯酸3-(三乙氧基甲硅烷基)丙酯(MPS)，然后采用吸收剂丙烯酰胺(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的热稳定性和形态，分别利用热重分析（TGA）和场发射扫描电子显微镜（FESEM）。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 纳米凝胶复合材料的掺入对环氧涂层自修复行为的功效。所制备的纳米凝胶复合材料对腐蚀性介质表现出优异的阻隔性能。研究发现功能化的 TiO2 纳米颗粒可显着增强环氧涂层的防腐性能。此外，结果验证了含有 1 wt.% TiO2 纳米凝胶复合材料的环氧树脂是最具防腐性的样品，EIS 和动电位极化测试的修复效率分别为 98% 和 94%。
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.