Nano-cerium dioxide synergistic potential on abrasion resistance and surface properties of polyurethane-nanocomposite coatings for esthetic and decorative applications on wood / Akbar Mastouri Mansourabad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1559-1570 Titre : Nano-cerium dioxide synergistic potential on abrasion resistance and surface properties of polyurethane-nanocomposite coatings for esthetic and decorative applications on wood Type de document : texte imprimé Auteurs : Akbar Mastouri Mansourabad, Auteur ; Mohammad Azadfallah, Auteur ; Asghar Tarmian, Auteur ; Davood Efhami Sisi, Auteur Année de publication : 2020 Article en page(s) : p. 1559-1570 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de glissement Bois -- Revêtements protecteurs Caractérisation Essais dynamiques Formation de film Oxyde de cérium Polyuréthanes Résistance à l'abrasion Revêtements -- Propriétés optiques Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Statistique Synergie Traitement thermique Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Development of an antiabrasion and optical shield clearcoat for wooden art and decorative works improves its esthetic durability and lifetime. In this study, the synergistic potentials of cerium dioxide nanoparticles (NPs) were exploited to improve the abrasive, structural, and surface properties of polyurethane (PU)/silica nanocomposite coatings applied on the thermally modified spruce wood. Microhardness, adhesion strength, contact angle, and UV–Vis spectroscopy were used to evaluate the nanocomposite coatings’ surface properties. FE-SEM and EDS techniques were also employed to scrutinize distribution of NPs in the structure of nanocomposite coatings. The results showed that the abrasion resistance significantly improves by increasing the content of silica NPs. However, microhardness and performance of nanocomposite coatings containing a high percentage of silica diminished due to the aggregation of NPs and poor crosslinking of the polymer matrix. The presence of cerium dioxide NPs as a synergistic function in the PU coatings containing nano-silica enhanced the abrasion resistance as well as the glass transition temperature and caused enhanced hardness. Incorporation of cerium dioxide NPs exhibited an incremental effect on the adhesion strength of nanocomposite coatings. However, its presence in high concentration caused an adverse impact on the transparency of the nanocomposite films. In addition, wettability of PU/silica composites remained constant after incorporating high levels of cerium oxide NPs. These findings suggest that use of Ce–Si NPs hybrid/blend in the structure of PU coatings can assure the durability of wood coatings for esthetic applications and interior decoration by strengthening the surface, mechanical, and optical properties. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Preparation of nanocomposite coatings - Differential scanning calorimetry (DSC) - Microhardness and adhesion strength measurements - Scanning electron microscopy (SEM) studies - Optical properties - Abrasion resistance and film thicknesses on wood - Contact angle - Statistical analysis - RESULTS AND DISCUSSION : Glass transition temperature (Tg) - Microhardness - Adhesion strength - SEM and EDS - Nanocomposite film formation - Abrasion resistance - Optical properties of coated wood and nanocomposite films - Contact angle DOI : https://doi.org/10.1007/s11998-020-00374-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00374-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34960 [article]

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