Development of bio-based polyester-urethane-acrylate (PUA) from citric acid for UV-curable coatings / Debarati Maity in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1083-1097 Titre : Development of bio-based polyester-urethane-acrylate (PUA) from citric acid for UV-curable coatings Type de document : texte imprimé Auteurs : Debarati Maity, Auteur ; Rahul Tade, Auteur ; Anagha S. Sabnis, Auteur Année de publication : 2023 Article en page(s) : p. 1083-1097 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères Bois -- Revêtements protecteurs Caractérisation Chimie analytique Citrique, Acide L'acide citrique est un acide alpha hydroxylé de formule C6H8O7. Il joue un rôle central dans le métabolisme de tous les organismes vivants et tient son nom de son origine; le citron. L'acide citrique est biodégradable et n'est pas toxique pour l'homme ni pour l'environnement. Cependant, comme tout acide, il est irritant et peut provoquer des brûlures s'il entre en contact prolongé avec des muqueuses. À pH physiologique, il est présent sous forme de sa base conjuguée, le citrate, qui est un chélateur de l'ion calcium dans le sang. Copolymère uréthane acrylate Polyesters Polymères -- Synthèse Polymères ramifiés Polyols Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : A novel UV-curable hyperbranched polyester-urethane-acrylate (PUA) resin was successfully synthesized using citric acid as a core bio-based material and ester-urethane-acrylate linkage as the arm and was applied on both wood and metal substrates. Citric acid was employed as a functionality-enhancing bio-based monomer for coating applications. This resin (PUA) was synthesized from citric acid (CA)-based polyester-polyol (CAP) and subsequently reacted with isophorone diisocyanate (IPDI) and end-capped with 2-hydroxyethylmethacrylate (HEMA) to form a tetra-functional acrylate precursor (UCAP). Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H-NMR) and gel permeation chromatography (GPC) were used to characterize the citric acid-based polyester-urethane-acrylate (UCAP). This oligomer was formulated with a reactive diluent and a photoinitiator (UCAP PUA), applied on both wood and metal substrates and cured under UV-radiation. The mechanical, chemical and thermal properties of the coated substrates were investigated and compared to a commercial urethane acrylate (CUA). The mechanical properties such as crosscut adhesion, pencil hardness, impact strength and flexibility showed comparable results. Even though the chemical resistance and free film properties of the synthesized urethane acrylate (UCAP) were found to be inferior, the thermal properties were observed to be superior. Note de contenu : - MATERIALS AND METHODS : Raw materials and chemicals - Synthesis of citric acid-based polyester-polyol (CAP) - Synthesis of citric acid based polyester-urethane-acrylate (UCAP) - Formulation of citric acid-based polyester-urethane-acrylate (UCAP PUA) - Characterizations and instrumentations - RESULTS AND DISCUSSION : Chemical analysis - Instrumental analysis - Characterization of coated films - Table 1 : Formulations of commercial and UCAP UV oligomers - Table 2 : GPC analysis of CAP and UCAP - Table 3 : Comparative optical and mechanical properties between commercial UA and UCAP PUA coatings - Table 4 : Comparative chemical properties between commercial UA and UCAP PUA coatings - Table 5 : Comparative free film properties between commercial UA and UCAP PUA coatings - Table 6 : Comparative stain tests between commercial UA and UCAP PUA - Table 7 : Comparative TGA data of Commercial UA and UCAP PUA DOI : https://doi.org/10.1007/s11998-022-00728-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00728-5.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39449 [article]

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