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Auteur Duygu Kocaefe
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Université du Québec - Chicoutimi - Canada
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Boreal forest conifer extracts : potential natural additives for acrylic polyurethane coatings for the protection of heat-treated jack pine / Sudeshna Saha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)
[article]
Titre : Boreal forest conifer extracts : potential natural additives for acrylic polyurethane coatings for the protection of heat-treated jack pine Type de document : texte imprimé Auteurs : Sudeshna Saha, Auteur ; Duygu Kocaefe, Auteur ; Yaman Boluk, Auteur ; Vakhtang Mshvildadze, Auteur ; Jean Legault, Auteur ; André Pichette, Auteur Année de publication : 2013 Article en page(s) : p. 109-122 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet
Additifs anti rayonnement ultraviolet
Antioxydants
Bioadditifs
Bois -- Revêtements protecteurs
Conifères
Décoloration
Ecorces
Essais accélérés (technologie)
Photodétérioration
Polyacryliques
Polyphénols
Polyuréthanes
Résistance au rayonnement ultraviolet
TerpènesLes terpènes sont une classe d'hydrocarbures, produits par de nombreuses plantes, en particulier les conifères. Ce sont des composants majeurs de la résine et de l'essence de térébenthine produite à partir de résine. Les terpènes se rencontrent également chez les Metazoas (phéromones et hormones sesquiterpéniques des Hexapodas, diterpènes d'organismes aquatiques (Cnidarias, Poriferas).Index. décimale : 667.9 Revêtements et enduits Résumé : Among consumers, heat-treated wood recently gained more importance due its attractive darker color along with several other advantages such as improved biological resistance, dimensional stability, and thermal insulating properties. However, exposure to the exterior environment drastically changes the attractive darker color of this product. From dark brown, it becomes almost white. For this reason, development of a nontoxic transparent coating which can protect the heat-treated wood from photodegradation is very important. Addition of UV stabilizers (UV absorbers, HALS, antioxidant) is necessary for transparent coatings in order to filter the harmful UV/VIS radiation. In this present study, the effectiveness of natural antioxidants, extracted from conifer barks or needles from trees in protecting the color of wood, as additives to acrylic polyurethane coating is examined. Also, their UV/VIS absorption capacities and semi-quantitative component analyses have been presented. The toxicity of these new products was also evaluated on human normal skin cells due to ever increasing environmental legislation. The chemical modification of acrylic polyurethane coating containing conifer bark and needle extract were examined by ATR–FTIR analysis. Promising results were obtained for these natural antioxidants which showed very high UV absorption characteristics and antioxidant activity. Note de contenu : - EXPERIMENTAL : Wood surface preparation - Preparation of bark crude extracts - Preparation of needle crude extracts - Transmission tests - Cell culture - Cytotoxicity - ORAC FL assay - This layer chromatography (TLC) - Preparation of coatings - Accelerating aging test - Color measurements - FTIR analysis
- RESULTS AND DISCUSSION : Extraction yield and cytotoxicity of various conifer bark extracts and needle extract - Antioxidant activity of extracts - UV absorption spectra of tested extracts - Chromatographic assessment of tested extracts - Color measurement - Visual assessments - FTIR analysesDOI : 10.1007/s11998-012-9435-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9435-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17479
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 1 (01/2013) . - p. 109-122[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14636 - Périodique Bibliothèque principale Documentaires Disponible 15124 - Périodique Bibliothèque principale Documentaires Disponible Effect of TiO2-containing nano-coatings on the color protection of heat-treated jack pine / Saha Sudeshna in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)
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Titre : Effect of TiO2-containing nano-coatings on the color protection of heat-treated jack pine Type de document : texte imprimé Auteurs : Saha Sudeshna, Auteur ; Duygu Kocaefe, Auteur ; K. Sarkar, Auteur ; Yaman Boluk, Auteur ; André Pichette, Auteur Année de publication : 2011 Article en page(s) : p. 183-190 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet
Bois -- Conservation
Dioxyde de titane
Essais accélérés (technologie)
Résistance au rayonnement ultraviolet
Revêtements
Revêtements protecteurs
Traitement thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The UV protective coatings were developed by incorporating triazine derivative organic UV stabilizers into inorganic titania particles which were produced by sol–gel method. The objective of this study is to delay the color change of heat-treated wood subjected to outdoor conditions. The protective coatings were prepared in air at room temperature. The coatings were not further treated thermally after their application to heat-sensitive materials. Coatings were applied to heat-treated jack pine wood. Subsequently, accelerated aging tests were carried out using coated and uncoated jack pine samples. The color change of the wood samples was studied, and the results were compared. Also, the morphological analyses were done using XPS after having weathered the wood at different times. Note de contenu : - EXPERIMENTAL : Coating preparation - Optical investigation - Accelerated aging test - Color measurement - XPS analysis.
- RESULTS : Transmittance of inorganic UV absorbing nano-coatings - Transmittance of organic UV absorber embedded in inorganic UV absorber - Accelerated aging of wood samples and color measurements - XPS analysis of the weathered wood samplesDOI : 10.1007/s11998-010-9294-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9294-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11360
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 2 (03/2011) . - p. 183-190[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012999 - Périodique Bibliothèque principale Documentaires Disponible