The preparation and study of functionalized graphene oxide/self-healing waterborne polyurethane composites / Zhiqiang Li 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. 1121-1132 Titre : The preparation and study of functionalized graphene oxide/self-healing waterborne polyurethane composites Type de document : texte imprimé Auteurs : Zhiqiang Li, Auteur ; Zhaoyang Zhang, Auteur ; Shouxiang Liu, Auteur ; Yang Qiao, Auteur ; Yanyan Wei, Auteur Année de publication : 2023 Article en page(s) : p. 1121-1132 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Angle de contact Caractérisation Diels-Alder, Réaction de La réaction de Diels-Alder est une réaction chimique utilisée en chimie organique, dans laquelle un alcène (diénophile) s'additionne à un diène conjugué pour former un dérivé du cyclohexène. Otto Diels et Kurt Alder reçurent le prix Nobel de chimie en 1950 pour les travaux relatifs à cette réaction. Dans le domaine des matériaux avancés et de la robotique souple on parle de "Polymères Diels-Alder" ("Diels-Alder polymers") pour décrire des polymères constitués de réseaux covalents thermoréversibles. (Wikipedia) Humidité -- Absorption:Eau -- Absorption Matériaux -- Propriétés fonctionnelles Oxyde de graphène Polyuréthanes Réaction de couplage Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Revêtements organiques Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, silane coupling agent KH560-FA containing furan groups was synthesized to modify the surface of graphene oxide, and maleimide group-capped waterborne polyurethane was synthesized at the same time. A self-healing material with a microcrosslinking network structure based on polymer/modified graphene oxide was synthesized by Diels–Alder (DA) reaction. The materials obtained can control the formation and fracture of DA chemical bonds under thermal stimulation and repair the damage macroscopically. With the addition of modified graphene oxide from 0 wt% to 0.4 wt%, the tensile strength of the material increased from 3.59 MPa to 15.27 MPa, the repair efficiency reached a maximum of 89.19%, the water contact angle increased from 61° to 77°, and the water absorption decreased from 10.52% to 3.40%. The addition of modified graphene oxide significantly improved the hydrophobicity and mechanical properties of the material. When the addition of KH560-FA-GO was 0.4 wt%, the corrosion resistance of the coating prepared by the emulsion was remarkably improved in deionized water, 5% sodium chloride solution, and 5% sulfuric acid solution. It showed the application potential of materials in the field of coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation of KH560-FA - Preparation of KH560-FA-modified graphene oxide - Preparation of KH560-FA-GO-modified waterborne polyurethane - CHARACTERIZATIONS - RESULTS AND DISCUSSION : Nuclear magnetic hydrogen spectrum - Infrared spectra of GO and KH560-FA-GO - Infrared spectra of waterborne polyurethane modified by KH560-FA-GO - RAMAN - XPS : Mechanical properties and self-healing properties - Analysis of mechanical properties and self-healing properties - Cross-sectional topography of composites with different KH560-FA-GO content - Water contact angle test - Water resistance test - Corrosion resistance - Table 1 : hxWPU with different proportions of KH560-FA-GO - Table 2 : Record of mechanical properties of WPU with different proportions of modified GO - Table 3 : Water absorption of self-healing WPU with different KH560-FA-GO contents - Table 4 : The surface condition of coatings with different KH560-FA-GO contents in different solutions on the third and ninth day DOI : https://doi.org/10.1007/s11998-022-00732-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00732-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39452 [article]

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