Synthesis and characterization of solvent-free hybrid alkyd resin with hyperbranched melamine core / Güngör Gündüz in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 831-843 Titre : Synthesis and characterization of solvent-free hybrid alkyd resin with hyperbranched melamine core Type de document : texte imprimé Auteurs : Güngör Gündüz, Auteur ; Nagehan Keskin, Auteur ; Ãœner Çolak, Auteur ; Bora Mavis, Auteur Année de publication : 2018 Article en page(s) : p. 831-843 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Brillance (optique) Composés organiques -- Synthèse Esterification Hexaméthylol mélamine Matériaux hybrides Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Polyalkydes Polymères ramifiés Revêtement de surface Revêtements -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a new hybrid alkyd resin was formulated using melamine-based hyperbranched polymer having 24 hydroxyl groups on its structure and relatively low molecular weight alkyd. The alkyd was synthesized using an oil mixture (40% linseed + 60% sunflower). Melamine was used as the core molecule for the hyperbranched polymer due to its excellent properties such as greater hardness, alkali and solvent resistance, and thermal stability. Melamine was first hydroxylated using formaldehyde and changed into hexamethylol melamine. This product was then twice hydroxylated with dimethylol propionic acid to obtain a hyperbranched polymer with 24 hydroxyl end groups. It was then reacted with low molecular weight alkyd resin at different proportions. The product had a low viscosity and could easily flow like oil. It is a solvent-free and water-free liquid. The ‘hyperbranched polymer/alkyd’ ratio affected physical properties of the liquid polymer and also the mechanical properties of the hardened polymer, which can be used for surface coating. The viscosity of the liquid resin decreases from 148 to 8.84 Pa.s as the hyperbranched-polymer-to-alkyd ratio is decreased from 1:3 to 1:24. On the other hand, the hardness of heat-treated resin decreases from 198 Persoz to 43 Persoz, respectively. That is, the increase in the amount of hyperbranched polymer in the resin increases hardness, whereas the increase in the amount of alkyd decreases it. The mechanical tests of hardened resins showed that all specimens passed conical mandrel bending test, and they all depicted high adhesion, and high abrasion and impact resistance. The specimens also had excellent gloss properties. Note de contenu : - SYNTHESIS OF HYPERBRANCHED POLYMER WITH MELAMINE CORE : Synthesis of hexamethylol melamine - Esterification of hexamethylol melamine - Synthesis of alkyd - CHARACTERIZATION OF PRODUCTS : FTIR spectra - Effect of the type of oil on surface appearance - MECHANICAL PROPERTIES : Hardness - Impact resistance - Bending resistance - Abrasioin resistance - Adhesion - Gloss DOI : 10.1007/s11998-017-0031-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0031-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30860 [article]

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