Investigation of cure advancement in dual-cure polyurethane-acrylate coatings over metal substrates / Mohsen Sarrafi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 3 (05/2018) . - p. 527-534 Titre : Investigation of cure advancement in dual-cure polyurethane-acrylate coatings over metal substrates Type de document : texte imprimé Auteurs : Mohsen Sarrafi, Auteur ; Babak Kaffashi, Auteur ; Saeed Bastani, Auteur Année de publication : 2018 Article en page(s) : p. 527-534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés organiques -- Synthèse Copolymère uréthane acrylate Diluants Fourier, Spectroscopie infrarouge à transformée de Photoréticulation Polyesters Polyols Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, a polyurethane acrylate (PUA) system cured via a thermal–UV (dual-cure process) was developed. The system selected for this work was a two-pack polyurethane acrylate with polyester polyol as the main component and urethane monoacrylate (UMA) as hardener. The polyester polyol was synthesized in a way to provide a final film coating containing both a suitable flexibility and high surface hardness. The thermal and photochemical curing behavior of the resin was studied via the chemorheology technique and the real-time FTIR. The Boltzmann sigmoidal model was implemented and well-fitted to the data obtained from the chemorheology measurements. The comparison between two reactive diluents, butanediol diacrylate (BDDA) and trimethylolpropane triacrylate (TMPTA) showed that BDDA reacts faster than TMPTA in the thermal curing condition. Nevertheless, the network buildup is stronger when TMPTA is used. The photopolymerization is also faster for the case of TMPTA. However, its final double bond conversion is restricted to a lower amount due to steric hindrance and higher viscosity of the system. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Synthesis of polyester polyol - Synthesis of urethane monoacrylate - Sample preparation - RESULTS AND DISCUSSION : Chemorheology - Real-time FTIR - MECHANICAL PROPERTIES DOI : 10.1007/s11998-017-0008-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0008-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30749 [article]

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