Accelerated weathering performance of Scots pine preimpregnated with copper-based chemicals before varnish coating - Part 1 : coated with cellulosic and polyurethane varnishes / Ahmet Gunduz in COLORATION TECHNOLOGY, Vol. 136, N° 1 (02/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 1 (02/2020) . - p. 34-44 Titre : Accelerated weathering performance of Scots pine preimpregnated with copper-based chemicals before varnish coating - Part 1 : coated with cellulosic and polyurethane varnishes Type de document : texte imprimé Auteurs : Ahmet Gunduz, Auteur ; Ergun Baysal, Auteur ; Turkay Turkoglu, Auteur ; Caglar Altay, Auteur ; Mustafa kucuktuvek, Auteur ; Huseyin Peker, Auteur Année de publication : 2020 Article en page(s) : p. 34-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique) Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Cuivre Décoloration Essais accélérés (technologie) Matériaux -- Imprégnation Pin sylvestre Polyuréthanes Vernis Index. décimale : 667.7 Cires, laques, vernis Résumé : This study aimed to determine the effect of accelerated weathering on gloss, surface hardness and colour changes of Scots pine (Pinus sylvestris L.). Test samples were impregnated with Adolit KD-5, Wolmanit CX-8 and Celcure AC-500 covered with cellulosic and polyurethane varnishes. The results showed that the values of surface hardness and gloss increased after accelerated weathering. While the surface hardness of Scots pine was increased for impregnated and polyurethane-coated varnish, it decreased for impregnated and cellulosic varnish-coated Scots pine after 1000 hours of accelerated weathering exposure. Copper-based chemical impregnation and varnish coating developed the gloss of Scots pine specimens relative to the surface characteristics observed in single-coated Scots pine specimens. While the most appropriate chemical was Celcure AC-500 for surface hardness, it was Adolit KD-5 for the gloss of Scots pine after 1000 hours of accelerated weathering exposure. Wood specimens impregnated prior to the application of varnish were more effective in stabilising the colour of Scots pine than Scots pine only coated with varnish. Polyurethane varnish-treated Scots pine showed better colour stability for each partial and total accelerated weathering exposure period. The total colour changes were lowest for polyurethane varnish-coated Scots pine impregnated with Celcure AC-500 after 1000 hours of accelerated weathering exposure. Note de contenu : - EXPERIMENTAL : Preparation of wood specimens and chemicals - Impregnation procedure - Coating of the wood surfaces - Surface hardness test - Gloss test - Colour test - Accelerated weathering test - RESULTS AND DISCUSSION : Surface hardness changes - Gloss changes - Colour changes DOI : https://doi.org/10.1111/cote.12435 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12435 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33698 [article]

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Surface properties of oriental beech wood coated with vegetable oil-based epoxide-amin nanocomposite materials after weathering / Yahya Kabasakal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 3 (05/2024) . - p. 925-938 Titre : Surface properties of oriental beech wood coated with vegetable oil-based epoxide-amin nanocomposite materials after weathering Type de document : texte imprimé Auteurs : Yahya Kabasakal, Auteur ; Ilknur Babahan-Bircan, Auteur ; Ergun Baysal, Auteur ; Caglar Altay, Auteur ; Hilmi Toker, Auteur Année de publication : 2024 Article en page(s) : p. 925-938 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Composites Corrosion par érosion Couleur Enrobage (technologie) Epoxy amine Hêtre Nanoparticules Nanotubes Revêtements organiques Rugosité Surfaces (Physique) Index. décimale : 667.9 Revêtements et enduits Résumé : This work examined the changes in surface characteristics of Oriental beech (Fagus orientalis L.) covered with vegetable oil-based epoxide-amine (ETO + D230) and its nanocomposite derivatives Epoxy + amine + carbon nanotube (ETO + D230 + C), Epoxy + amine + fullerene (ETO + D230 + F), and Epoxy + amine + graphene (ETO + D230 + G) doped with carbon nanoparticles following weathering. Results showed that while all coated groups displayed good lightness stability following weathering, the non-coated (control) group produced negative lightness stability values. The coated Oriental beech had greater overall color stability than the uncoated (control) group. The specimens coated with ETO + D230 + C nanocomposite exhibited the best color stability. All uncoated and coated specimens produced negative a* and positive b* values, indicating a propensity to turn greenish or yellowish after weathering, respectively. After weathering, while the surface roughness values of all specimens increased, their gloss decreased. In addition, after weathering, all coated samples had less gloss loss and lower surface roughness than the control group. Our findings show that following weathering, Oriental beech coated with ETO + D230 + C, ETO + D230 + F, and ETO + D230 + G nanocomposites have better surface properties than ETO + D230-coated Oriental beech. Note de contenu : - MATERIALS AND METHODS : Experimental - Methods - Preparation of epoxide-amine coatings - Preparation of epoxide-nanocomposite coatings - Preparation of wood - Color test - Gloss test - Surface roughness test - Weathering test - RESULTS AND DISCUSSION : Color - Gloss test - Surface roughness DOI : https://doi.org/10.1007/s11998-023-00860-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00860-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41067 [article]

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