UV-curable polyurethane inorganic-organic hybrid coatings / Tong Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1461-1479 Titre : UV-curable polyurethane inorganic-organic hybrid coatings Type de document : texte imprimé Auteurs : Tong Xu, Auteur ; Irina J. Zvonkina, Auteur ; Mark D. Soucek, Auteur Année de publication : 2021 Article en page(s) : p. 1461-1479 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aminopropyltriethoxysilane Composés organiques -- Synthèse Diisocyanate d'isophorone Diluants Formulation (Génie chimique) Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Oligomères Polyméthacrylate d'hydroxyéthyle Polyuréthanes Revêtements -- Propriétés mécaniques Sol-gel, Procédé Tétraéthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : A UV-curable inorganic/organic hybrid coating was prepared from a methacrylated urethane oligomer, a reactive diluent, tetraethyl orthosilicate (TEOS) oligomers, and a free radical photoinitiator. The reactive diluent was synthesized using IPDI, HEMA, and aminopropyltetraethoxysilane (APTES), resulting in both inorganic and organic reactive groups. The photocuring kinetics was investigated using photo-DSC and real-time FTIR spectroscopy. The effect of the reactive diluent and TEOS oligomers concentration was investigated using impact resistance, pencil hardness, and adhesion. Two glass transition temperatures were observed, indicating a substantial interfacial phase generated between the inorganic and organic domains. The reactive diluent-to-reactive oligomer ratio had a larger effect on the mechanical behavior of the system than the TEOS concentration did. Adhesion improves with increasing TEOS oligomer concentration or reactive diluent concentration until maxima, after which increasing concentration has an adverse effect on adhesion. Note de contenu : - MATERIALS : Synthesis of the reactive diluents - Synthesis of the acrylated urethane oligomers - Synthesis of TEOS oligomers - Coating formulation and application - Characterization of the film properties - RESULTS AND DISCUSSION : The photocuring kinetics - Viscoelastic properties of the hybrid films - Tensile and general coatings properties - Table 1 : Formulation of hybrid coatings with different contents of the reactive diluent - Table 2 : Formulations of hybrid coatings with different contents of the TEOS oligomers - Table 3 : Viscoelastic properties of the hybrid films as a function of the reactive diluent contents with 2.5 wt% of the TEOS oligomers - Table 4 : Viscoelastic properties of hybrid films as a function of TEOS oligomers with the ratio of reactive diluents to acrylated urethane prepolymers: 25/75 - Table 5 : General coating properties of hybrid films as a function of reactive diluents with 2.5 wt% TEOS oligomers - Table 6 : General coating properties of the hybrid films as a function of the TEOS oligomers, with the ratio of reactive diluents to urethane oligomers of 2.0 mol/mol DOI : https://doi.org/10.1007/s11998-021-00473-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00473-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36802 [article]

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