Fernández-Álvarez Maria, Velasco Francisco, Bautista Asuncion, Lobo Flavia Cristina M, Fernandes Emanuel M, Reis Rui L
Department of Materials Science and Engineering, IAAB, Universidad Carlos III de Madrid, Avda. Universidad 30, Leganés, 28903 Madrid, Spain.
3B's Research Group, I3Bs-Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.
Polymers (Basel). 2020 Oct 8;12(10):2298. doi: 10.3390/polym12102298.
Polyamide coatings are thermoplastics with great advantages such as a good corrosion protection of the base metal and wear resistance. Their application as powder coatings is an environmentally friendly option that is currently attracting growing interest. However, during their life service, they can sometimes be exposed to conditions that they are unable to stand. In this work, a polyamide 11 (PA11) powder was reinforced with different percentages of silica nanoparticles (1-3 wt. %). Powder mixtures were prepared through extrusion followed by compression molding processes to manufacture coatings. For the coatings under study, the effect of 500 h xenon exposure was studied in order to know their ultraviolet (UV) resistance. Attenuated total reflection-Fourier transform infrared spectroscopy (FTIR-ATR) and differential scanning calorimetry (DSC) tests were performed to study changes in polymer structure and if they are affected by nanoparticles. The effect of nanoadditions and xenon exposure on hardness and stiffness were also evaluated. Furthermore, reciprocal wear tests were performed before and after irradiation, and the wear tracks were analyzed using optoelectronic microscopy and scanning electron microscopy (SEM). Finally, the aesthetic properties were measured. The results reveal improvements in mechanical and wear properties when 1% nanosilica is added to the PA11, which then become more relevant after xenon radiation exposure.
聚酰胺涂层是具有诸多优点的热塑性塑料，如对基体金属有良好的防腐蚀性能和耐磨性。它们作为粉末涂料的应用是一种环保选择，目前正吸引着越来越多的关注。然而，在其使用寿命期间，它们有时会暴露在无法承受的条件下。在这项工作中，聚酰胺11（PA11）粉末用不同百分比（1 - 3重量%）的二氧化硅纳米颗粒进行增强。通过挤出随后压缩成型工艺制备粉末混合物以制造涂层。对于所研究的涂层，研究了500小时氙气暴露的影响，以了解其抗紫外线（UV）性能。进行了衰减全反射 - 傅里叶变换红外光谱（FTIR - ATR）和差示扫描量热法（DSC）测试，以研究聚合物结构的变化以及它们是否受到纳米颗粒的影响。还评估了纳米添加剂和氙气暴露对硬度和刚度的影响。此外，在辐照前后进行了往复磨损试验，并使用光电显微镜和扫描电子显微镜（SEM）分析磨损轨迹。最后，测量了美学性能。结果表明，当向PA11中添加1%纳米二氧化硅时，机械性能和耐磨性能得到改善，在氙气辐射暴露后这些性能变得更加显著。
