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Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica
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 ca...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7600192/ https://www.ncbi.nlm.nih.gov/pubmed/33049946 http://dx.doi.org/10.3390/polym12102298 |
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author | Fernández-Álvarez, Maria Velasco, Francisco Bautista, Asuncion Lobo, Flavia Cristina M. Fernandes, Emanuel M. Reis, Rui L. |
author_facet | Fernández-Álvarez, Maria Velasco, Francisco Bautista, Asuncion Lobo, Flavia Cristina M. Fernandes, Emanuel M. Reis, Rui L. |
author_sort | Fernández-Álvarez, Maria |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-7600192 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-76001922020-11-01 Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica Fernández-Álvarez, Maria Velasco, Francisco Bautista, Asuncion Lobo, Flavia Cristina M. Fernandes, Emanuel M. Reis, Rui L. Polymers (Basel) Article 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. MDPI 2020-10-08 /pmc/articles/PMC7600192/ /pubmed/33049946 http://dx.doi.org/10.3390/polym12102298 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Fernández-Álvarez, Maria Velasco, Francisco Bautista, Asuncion Lobo, Flavia Cristina M. Fernandes, Emanuel M. Reis, Rui L. Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica |
title | Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica |
title_full | Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica |
title_fullStr | Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica |
title_full_unstemmed | Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica |
title_short | Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica |
title_sort | manufacturing and characterization of coatings from polyamide powders functionalized with nanosilica |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7600192/ https://www.ncbi.nlm.nih.gov/pubmed/33049946 http://dx.doi.org/10.3390/polym12102298 |
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