Synthesis of phytic acid-layered zinc oxide hybrid nanoparticles and their flame-retardant applications in polyurethane coatings / Karan Bansal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 369-382 Titre : Synthesis of phytic acid-layered zinc oxide hybrid nanoparticles and their flame-retardant applications in polyurethane coatings Type de document : texte imprimé Auteurs : Karan Bansal, Auteur ; Siavash Mansouri, Auteur ; Dilpreet Bajwa, Auteur ; Shanti Swarup, Auteur ; Mohiuddin Quadir, Auteur Année de publication : 2024 Article en page(s) : p. 369-382 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Enrobage (technologie) Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Nanoparticules -- Synthèse Oxyde de zinc Phytique, Acide Polyuréthanes Revêtements -- Additifs Revêtements -- Propriétés thermiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Phytic acid (PA)-coated zinc oxide (ZnO) nanoparticles were developed to produce high-efficiency flame-retarding (FR) additives for coating formulations. These hybrid (organic/inorganic) additives were fabricated using a layer-by-layer (LBL) approach to harness the FR properties of PA and ZnO on a single-platform nanoscale scaffold. These nanoparticles can be uniformly dispersed in a polyurethane (PU) coating for applications on metal substrates. The incorporation of the PA/ZnO layer-by-layer nanoparticles at 20 wt% of the polymeric resin did not adversely affect the physico-mechanical properties of the coatings. Flame-retardant properties of PU samples containing nanomaterials, showed a 50% reduction in flame spread rate than that observed from the samples prepared with only ZnO nanoparticles. Cone calorimeter studies performed on the metal panels coated with 20 wt% PA/ZnO nanoparticles-infused PU resins showed a 25% reduction in peak heat release rate and a 50% reduction in total heat release (THR) compared to control coatings prepared without nanoparticles. Scanning electron microscopy images revealed the presence of bubble-like morphologies in the burnt samples containing the nanoparticles, indicating char formation and obstruction of escaping gases produced during the burning of the coating materials. This study clearly reveals that the coatings prepared with PA/ZnO hybrid nanoparticles can protect metal substrates against fire-related damage. Note de contenu : - MATERIALS : Methods - Characterization of nanoparticles - Characterization of PU coatings on metal substrates - RESULTS AND DISCUSSION : Synthesis of PA-layered ZnO nanoparticles as functional FR nanomaterials - Nano-chemical and thermal characterization of nanoparticles - Incorporation of PA-layered ZnO nanoparticles in PU coatings and analysis of coating properties - Characterization of thermal properties of PU coatings containing PA/ZnO nanoparticles using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) - Evaluation of FR properties using cone calorimeter studies - Horizontal burning test of UL-94 samples prepared from nanoparticle-infused PU resins - Table 1 : Particle size (hydrodynamic diameter) of the nanoparticles along with PDI and zeta potential - Table 2 : Coating properties of polyurethane (PU) formulations containing ZnO nanoparticles and ZnO/PA-BL nanoparticles at different loading concentrations - Table 3 : Glass transition temperature (Tg), degradation temperature at 5% weight loss (Td5), and weight remaining of the film after exposure to 500°C of the polyurethane coatings - Table 4 : Time to ignition (TTI), peak heat release rate (pHRR), total heat release (THR), total smoke release (TSR), and flame retardancy index (FRI) of control coating and coatings containing ZnO and ZnO/PA-BL nanoparticles at 20 wt% loading concentration DOI : https://doi.org/10.1007/s11998-023-00828-w En ligne : https://drive.google.com/file/d/13XsUainuKttYmpAr5TC8PkMi_hhQEXdE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40459 [article]

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