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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Study of the simultaneous effects of MMT nanoclay and hydrophobically modified ethoxylated urethane (HEUR) on viscoelastic and steady shear properties of water-based acrylic resins / Mohsen Sarrafi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 5 (09/2013) . - p. 727-731 Titre : Study of the simultaneous effects of MMT nanoclay and hydrophobically modified ethoxylated urethane (HEUR) on viscoelastic and steady shear properties of water-based acrylic resins Type de document : texte imprimé Auteurs : Mohsen Sarrafi, Auteur ; Babak Kaffashi, Auteur ; Mohammad Barmar, Auteur Année de publication : 2013 Article en page(s) : p. 727-731 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Hydrophobie Montmorillonite Nanoparticules Polyacryliques Polyuréthane éthoxylé modifié de façon hydrophobe Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Stabilité au stockage Index. décimale : 667.9 Revêtements et enduits Résumé : The storage stability of montmorillonite/acrylic resin was studied via rheological characterizations. The Na+–MMT nanoclay and a water-based acrylic resin were used for the preparation of different suspension samples. The effect of an associative polymer such as hydrophobically modified ethoxylated urethane (HEUR) in the mixture was also investigated. The result showed that the existence of an associative polymer has an influence on the stability and zero-shear viscosity of the system. In order to determine the behavior of this system under long-term storage, various rheological characterizations such as frequency sweep and rate sweep measurements were carried out. The results showed that adding the montmorillonite nanoclay and HEUR to the acrylic resin causes short- and long-term stabilities of suspensions microstructure. The required stability, a better flow, and a better structure were achieved, respectively, upon addition of an associative polymer, addition of MMT–Na+, and flow cessation. DOI : 10.1007/s11998-013-9496-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9496-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19806 [article]

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