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Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS
Versatile product protective coatings that deliver faster drying times and shorter minimum overcoat intervals that enable curing at faster line speeds and though lower energy consumption are often desired by coating manufacturers. Product protective coatings, based on silsesquioxane-modified diglyci...
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/PMC7182962/ https://www.ncbi.nlm.nih.gov/pubmed/32151007 http://dx.doi.org/10.3390/polym12030591 |
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author | Rodošek, Mirjana Mihelčič, Mohor Čolović, Marija Šest, Ervin Šobak, Matic Jerman, Ivan Surca, Angelja K. |
author_facet | Rodošek, Mirjana Mihelčič, Mohor Čolović, Marija Šest, Ervin Šobak, Matic Jerman, Ivan Surca, Angelja K. |
author_sort | Rodošek, Mirjana |
collection | PubMed |
description | Versatile product protective coatings that deliver faster drying times and shorter minimum overcoat intervals that enable curing at faster line speeds and though lower energy consumption are often desired by coating manufacturers. Product protective coatings, based on silsesquioxane-modified diglycidyl ether of bisphenol-A (DGEBA) epoxy resin, are prepared through a glycidyl ring-opening polymerization using dicyandiamide (DICY) as a curing agent. As silsesquioxane modifier serves the octaglycidyl-polyhedral oligomeric silsesquioxane (GlyPOSS). To decrease the operational temperature of the curing processes, three different accelerators for crosslinking are tested, i.e., N,N-benzyl dimethylamine, 2-methylimidazole, and commercial Curezol 2MZ-A. Differential scanning calorimetry, temperature-dependent FT-IR spectroscopy, and rheology allow differentiation among accelerators’ effectiveness according to their structure. The former only contributed to epoxy ring-opening, while the latter two, besides participate in crosslinking. The surface roughness of the protective coatings on aluminum alloy substrate decreases when the accelerators are applied. The scanning electron microscopy (SEM) confirms that coatings with accelerators are more homogeneous. The protective efficiency is tested with a potentiodynamic polarization technique in 0.5 M NaCl electrolyte. All coatings containing GlyPOSS, either without or with accelerators, reveal superior protective efficiency compared to neat DGEBA/DICY coating. |
format | Online Article Text |
id | pubmed-7182962 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-71829622020-05-01 Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS Rodošek, Mirjana Mihelčič, Mohor Čolović, Marija Šest, Ervin Šobak, Matic Jerman, Ivan Surca, Angelja K. Polymers (Basel) Article Versatile product protective coatings that deliver faster drying times and shorter minimum overcoat intervals that enable curing at faster line speeds and though lower energy consumption are often desired by coating manufacturers. Product protective coatings, based on silsesquioxane-modified diglycidyl ether of bisphenol-A (DGEBA) epoxy resin, are prepared through a glycidyl ring-opening polymerization using dicyandiamide (DICY) as a curing agent. As silsesquioxane modifier serves the octaglycidyl-polyhedral oligomeric silsesquioxane (GlyPOSS). To decrease the operational temperature of the curing processes, three different accelerators for crosslinking are tested, i.e., N,N-benzyl dimethylamine, 2-methylimidazole, and commercial Curezol 2MZ-A. Differential scanning calorimetry, temperature-dependent FT-IR spectroscopy, and rheology allow differentiation among accelerators’ effectiveness according to their structure. The former only contributed to epoxy ring-opening, while the latter two, besides participate in crosslinking. The surface roughness of the protective coatings on aluminum alloy substrate decreases when the accelerators are applied. The scanning electron microscopy (SEM) confirms that coatings with accelerators are more homogeneous. The protective efficiency is tested with a potentiodynamic polarization technique in 0.5 M NaCl electrolyte. All coatings containing GlyPOSS, either without or with accelerators, reveal superior protective efficiency compared to neat DGEBA/DICY coating. MDPI 2020-03-05 /pmc/articles/PMC7182962/ /pubmed/32151007 http://dx.doi.org/10.3390/polym12030591 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 Rodošek, Mirjana Mihelčič, Mohor Čolović, Marija Šest, Ervin Šobak, Matic Jerman, Ivan Surca, Angelja K. Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS |
title | Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS |
title_full | Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS |
title_fullStr | Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS |
title_full_unstemmed | Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS |
title_short | Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS |
title_sort | tailored crosslinking process and protective efficiency of epoxy coatings containing glycidyl-poss |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7182962/ https://www.ncbi.nlm.nih.gov/pubmed/32151007 http://dx.doi.org/10.3390/polym12030591 |
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