Synthesis of phosphorous-containing bio-based curing agent for flame retardant epoxy resin system / V. E. Naiker in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1325-1341 Titre : Synthesis of phosphorous-containing bio-based curing agent for flame retardant epoxy resin system Type de document : texte imprimé Auteurs : V. E. Naiker, Auteur ; Ganesh A. Phalak, Auteur ; D. A. Patil, Auteur ; Aarti Purushottam More, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2023 Article en page(s) : p. 1325-1341 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Caractérisation Combustion Dichlorure de phénylphosphoneux Epoxydes Essais de comportement au feu Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Réticulants -- Synthèse Vanilline Index. décimale : 667.9 Revêtements et enduits Résumé : A phosphorous containing primary amine-based curing agent, 4-(((3-aminopropyl) imino) methyl)-2-methoxyphenyl(4-(((3-aminopropyl) imino) methyl)-2-methoxyphenyl) phenylphosphonate (VDTS2), was successfully synthesized. The chemical structure of the intermediate and the curing agent was characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance spectroscopy. An epoxy resin was then cured with the phosphorous-based curing agent used in different ratios and with a petroleum-based curing agent. The flame-retardant (FR) properties and thermal decomposition of the respective films were investigated by the limiting oxygen index (LOI), UL-94 burning test, differential scanning calorimetry, thermogravimetric analysis (TGA) and FTIR spectroscopy. Scanning electron microscopy (SEM) analysis was also conducted to study the characteristics of the char obtained. The results of the FR tests showed that the epoxy films cured with the novel amine VDTS2 were able to achieve flame retardancy with an LOI value of 35% and a UL-94 rating of V-0. The TGA analysis showed that the residue of the flame retardant epoxy systems was almost double that of the epoxy resin cured with the petroleum-based amine. The respective films’ mechanical properties were also investigated, and it was observed that the phosphorous-containing amine-based curing agent showed potential to replace the petroleum-based amine for crosslinking epoxy resins. Note de contenu : - EXPERIMENTAL DETAILS : - Materials - Synthesis of VDTS1 (bis(4-formyl-2-methoxyphenyl) phenylphosphonate) - Synthesis of VDTS2 (4-(((3-aminopropyl)imino)methyl)-2-methoxyphenyl (4-(((3-aminopropyl)imino)methyl)-2-methoxyphenyl) phenylphosphonate) - Film and panel preparation - CHARACTERIZATION : - Chemical analysis - Fourier transform infrared (FTIR) spectroscopy - Nuclear magnetic resonance (NMR) spectroscopy - Thermogravimetric analysis (TGA) - Differential scanning calorimetry (DSC) analysis - Scanning electron microscopy (SEM) - Limiting oxygen index (LOI) and UL-94 vertical burning test - Mechanical properties - RESULTS AND DISCUSSION : - Chemical analysis - Fourier transform infrared (FTIR) spectroscopy - Nuclear magnetic resonance (NMR) spectroscopy - Thermogravimetric analysis (TGA) - Differential scanning calorimetry (DSC) analysis - Limiting oxygen index (LOI) and UL-94 vertical burning test - Scanning electron microscopy (SEM) - FTIR of char residue - Mechanical properties - Table 1 Epoxy and amine weight ratios - Table 2 UL-94 ratings - Table 3 Theoretical and experimental amine values of VDTS2 - Table 4 Thermal property of cured epoxy films - Table 5 UL-94 and LOI test results - Table 6 Mechanical property of films DOI : https://doi.org/10.1007/s11998-022-00747-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00747-2.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39719 [article]

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