Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2021-04-07 , DOI: 10.1016/j.porgcoat.2021.106258 Diego Moreira Schlemper , Sérgio Henrique Pezzin
This study evaluated the self-healing efficiency of an epoxy coating added with poly(urea-formaldehyde) microcapsules filled with triethylenetetramine (TETA), aminated poly(dimethylsiloxane) (PDMS-a), or a polyamide/polyamine compound (PA), by measurements of corrosion evolution (salt spray tests), scanning electron microscopy (SEM), electrochemical impedance (EIS), infrared (FTIR) and x-ray photoelectron (XPS) spectroscopies. Salt spray tests showed that the coatings added with PDMS-a and PDMS-a/TETA had better substrate protection. It was also observed that the protective performance is influenced by the increase in the mass content of microcapsules and by the curing temperature. In general, the addition of 15 % of microcapsules, with curing at 60 °C, showed better protection effect. EIS results showed that additives coated with PDMS-a and PDMS-a/ TETA present higher values of impedance modulus |Z| than the original coating without microcapsules, proving the partial self-healing of the system. It was found that some EIS measurements reached |Z| values close to the coating without failure, a consequence of the point release of PDMS-a, as observed in SEM images, which also confirm that the crack width was significantly reduced and part of crack planes relinked after 48 h. XPS spectra indicated that the polymer found in the region of the failure was PDMS-a.
中文翻译:
包含填充有不同胺化合物的微胶囊的自修复环氧涂料–对比研究
这项研究通过以下方法评估了环氧涂料的自修复效率,该环氧涂料添加了填充有三亚乙基四胺(TETA),胺化聚(二甲基硅氧烷)(PDMS-a)或聚酰胺/多胺化合物(PA)的聚(脲-甲醛)微胶囊。腐蚀演变的测量(盐雾测试),扫描电子显微镜(SEM),电化学阻抗(EIS),红外(FTIR)和X射线光电子(XPS)光谱。盐雾测试表明,添加了PDMS-a和PDMS-a / TETA的涂料具有更好的基材保护性能。还观察到保护性能受微胶囊质量含量的增加和固化温度的影响。通常,添加15%的微胶囊并在60°C的温度下固化会显示出更好的保护效果。EIS结果表明,涂有PDMS-a和PDMS-a / TETA的添加剂呈现出较高的阻抗模量| Z |。与没有微胶囊的原始涂层相比,证明了系统的部分自我修复。发现一些EIS测量值达到| Z |。SEM图像中观察到,PDMS-a点释放的结果是接近涂层而没有破坏的值,这也证实了裂纹宽度显着减小,并且48 h后部分裂纹平面重新连接。XPS光谱表明,在失效区域发现的聚合物为PDMS-a。在SEM图像中观察到PDMS-a的点释放的结果,这也证实了裂纹宽度显着减小,并且48 h后部分裂纹平面重新连接。XPS光谱表明,在失效区域发现的聚合物为PDMS-a。在SEM图像中观察到PDMS-a的点释放的结果,这也证实了裂纹宽度显着减小,并且48 h后部分裂纹平面重新连接。XPS光谱表明,在失效区域发现的聚合物为PDMS-a。