Enhancing weathering durability of pre-protected and unprotected wood by using bark extracts as natural UV absorbers in waterborne acrylic coating / Özlem Özgenç in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 303–321 Titre : Enhancing weathering durability of pre-protected and unprotected wood by using bark extracts as natural UV absorbers in waterborne acrylic coating Type de document : texte imprimé Auteurs : Özlem Özgenç, Auteur ; Ebru Bilici, Auteur ; Sefa Durmaz, Auteur ; Cevdet Sögütlü, Auteur ; Serkan Emik, Auteur Année de publication : 2022 Article en page(s) : p. 303–321 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet Adhésion Bois -- Revêtements protecteurs Caractérisation Colorimétrie Ecorces Essais accélérés (technologie) Extraits de plantes Polyacryliques Résistance aux conditions climatiques Revêtements -- Analyse Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : One of the crucial problems for wooden garden furniture is fading with the effect of UV rays. The color changes as a result of weathering have affected the usage of furniture. In this study, waterborne acrylic coatings containing bark extracts were evaluated as an environment-friendly wood surface preservative to improve the service life of wood in outdoor conditions. For this purpose, waterborne acrylic coatings were produced using extracts from the bark of 10 tree species applied on two different wood surfaces (scots pine and beech). The natural weathering test was conducted to determine the changes in the physical, mechanical and chemical structures of the coatings and wooden surfaces. It was observed that the color changes and surface roughness values were similar to the control samples for the heat-treated wood while they were the lowest for the impregnated scots pine. The color change of the test coatings applied on the unprotected scots pine surfaces provided similar results to the control coatings. The ATR-FTIR spectroscopy analysis revealed changes in the chemical structure, which explained why color changes occurred. The pre-protection methods affected the penetration of coatings and adhesion strength. The differences in the chemical structure of barks also influenced the viscosity of the coatings. After the weathering test, the change in the dry film thickness and adhesion strength of the acrylic coatings containing bark extract was similar to the control coatings for the heat-treated wood. The change in the adhesion strength values in the test coatings on the pine surfaces was similar to the control coatings. The macroscopic evaluation also showed the effectiveness of the bark extracts against weathering conditions. It is thought that it may be possible to use tree bark extracts with high UV absorbability instead of commercial UV absorbers in waterborne acrylic coatings used in outdoor conditions. Note de contenu : - MATERIAL AND METHOD : Wood and bark samples - Pre-protection methods - Bark extraction and coating system process - Coating system process - Chemical analysis of coating systems - Natural weathering test - Color measurement - Adhesion strength test - RESULTS AND DISCUSSION : UV–Vis spectroscopy analysis and liquid ATR-FTIR of test and control coatings - Color change in natural weathering conditions - ATR-FTIR spectroscopy analysis - Surface roughness change and macroscopic evaluation in natural weathering conditions - Change in dry film thickness - Change in adhesion strength - Table 1: Impregnation retention and heat treatment weight loss values of wood samples - Table 2 : Total phenol content and antioxidant activity of tree bark extracts (BE) - Table 3 : Acrylic resin types for wood coating systems - Table 4 : The viscosity values of test and control waterborne acrylic coatings - Table 5 : Some characteristic IR bands of functional groups in all coatings on the pre-protected and unprotected wood pine surfaces - Table 6 : Relative changes in the characteristic peak bands’ high ratio for FTIR analysis - Table 7 : Macroscopic evaluation scoring of test and control coatings on the wood surfaces after weathering test DOI : https://doi.org/10.1007/s11998-021-00528-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00528-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37160 [article]

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Synthesis of silicone-acrylic-modified high-ortho novolac resin with enhanced thermal resistance and surface coating properties / Serkan Emik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1679-1690 Titre : Synthesis of silicone-acrylic-modified high-ortho novolac resin with enhanced thermal resistance and surface coating properties Type de document : texte imprimé Auteurs : Serkan Emik, Auteur ; Tülin Banu Iyim, Auteur ; Saadet özgümüs, Auteur Année de publication : 2021 Article en page(s) : p. 1679-1690 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Caractérisation Polymères -- Synthèse Résistance à l'humidité:Résistance à l'eau Revêtements -- Propriétés chimiques Revêtements -- Propriétés physiques Revêtements -- Propriétés thermiques Revêtements organiques Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Vinyltriméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, vinyltrimethoxysilane was used to modify high-ortho novolac resin (NR) to obtain a vinyl silicone-modified phenolic oligomer (Si-mod NR). Subsequently, this oligomer is polymerized with methyl methacrylate. The mid-products (NR and Si-mod NR) and synthesized silicone-modified phenolic/acrylic resin (Ac/Si-mod NR) were characterized by Fourier transform infrared spectroscopy, and thermal properties were investigated by using thermal gravimetric analysis and differential scanning calorimetry techniques. In addition, the surface coating properties, including drying, hardness, adhesion, impact resistance, gloss, acid, alkaline, water, and solvent resistance of the films prepared from these products, were comparatively investigated. The results showed that the modification reactions yield a novel resin (Ac/Si-mod NR), which can be easily used as a surface coating material with high thermal resistance, flexibility, and excellent film properties. Note de contenu : - EXPERIMENTAL : Material and instruments - Synthesis of high-ortho novolac resin (NR) - Synthesis of silane and vinyl-modified novolac intermediate (Si-mod NR) - Polymerization of Si-mod NR intermediate with the acrylic monomer (Ac/Si-mod NR) - Film preparation - Characterization of surface coating properties - RESULTS AND DISCUSSION : Synthesis and characterization studies - Film properties of the products - - Table 1 : The list of surface coating test standards - Table 2 : Specific weight loss temperatures and the char yields of the products - Table 3 : Film properties of the products (drying, adhesion, hardness, impact resistance, and gloss) - Table 4 : Water resistance properties of the films - Table 5 : Alkaline resistance properties of the films - Table 6 : Acid resistance properties of the films - Table 7 Solvent resistance properties of the films DOI : https://doi.org/10.1007/s11998-021-00527-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00527-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36825 [article]

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