Documents disponibles écrits par cet auteur

Epoxy Resins Cross-Linked with Bisphenol A/Methylenedianiline Novolac Resin Type / Fanica R. Mustata in Industrial & engineering chemistry research, Vol. 51 N° 25 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8415–8424 Titre : Epoxy Resins Cross-Linked with Bisphenol A/Methylenedianiline Novolac Resin Type : Curing and Thermal Behavior Study Type de document : texte imprimé Auteurs : Fanica R. Mustata, Auteur ; Nita Tudorachi, Auteur ; Ioan Bicu, Auteur Année de publication : 2012 Article en page(s) : pp. 8415–8424 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermal  behavior Résumé : A novolac type resin was synthesized from bisphenol A, 4,4′-methylenedianiline, and formaldehyde in the presence of HCl. The chemical structure was confirmed using elemental analysis, FT-IR spectroscopy, and 1H NMR spectroscopy. The curing kinetics of these epoxy resins at an epoxy ring/amine proton molar ratio of 1/1, were studied by nonisothermal differential scanning calorimetry (DSC) at different heating rates. The kinetic analysis of the curing reactions was evaluated using the variable peak exotherm method of Flynn–Wall–Ozawa and Kissinger. The thermal degradation mechanisms for novolac resin (FR) and cured resins were identified taking place between two and four steps, depending on the chemical structure of the sample. The most probable kinetic model and kinetic parameters of the degradation process were estimated using Netzsch Thermokinetics software. The cured resins have good thermal stability, with activation energies of thermal degradation reactions having values situated in the range 127–184 kJ·mol–1. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202909s [article] Epoxy Resins Cross-Linked with Bisphenol A/Methylenedianiline Novolac Resin Type : Curing and Thermal Behavior Study [texte imprimé] / Fanica R. Mustata, Auteur ; Nita Tudorachi, Auteur ; Ioan Bicu, Auteur . - 2012 . - pp. 8415–8424. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8415–8424 Mots-clés : Thermal  behavior Résumé : A novolac type resin was synthesized from bisphenol A, 4,4′-methylenedianiline, and formaldehyde in the presence of HCl. The chemical structure was confirmed using elemental analysis, FT-IR spectroscopy, and 1H NMR spectroscopy. The curing kinetics of these epoxy resins at an epoxy ring/amine proton molar ratio of 1/1, were studied by nonisothermal differential scanning calorimetry (DSC) at different heating rates. The kinetic analysis of the curing reactions was evaluated using the variable peak exotherm method of Flynn–Wall–Ozawa and Kissinger. The thermal degradation mechanisms for novolac resin (FR) and cured resins were identified taking place between two and four steps, depending on the chemical structure of the sample. The most probable kinetic model and kinetic parameters of the degradation process were estimated using Netzsch Thermokinetics software. The cured resins have good thermal stability, with activation energies of thermal degradation reactions having values situated in the range 127–184 kJ·mol–1. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202909s