Accelerated weathering performance of wood-plastic composites reinforced with carbon and glass fibre-woven fabrics / Sefa Durmaz in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 71-81 Titre : Accelerated weathering performance of wood-plastic composites reinforced with carbon and glass fibre-woven fabrics Type de document : texte imprimé Auteurs : Sefa Durmaz, Auteur ; Yusuf Ziya Erdil, Auteur ; Özlem Özgenç, Auteur Année de publication : 2022 Article en page(s) : p. 71-81 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Composites à fibres Composites à fibres végétales Essais accélérés (technologie) Essais dynamiques Fibres de carbone Fibres de verre Flexion (mécanique) Polyéthylène greffé anhydride maléique Polyéthylène haute densité Réaction de couplage Résistance aux conditions climatiques Index. décimale : 668.4 Plastiques, vinyles Résumé : Wood-plastic composites (WPCs) are new generation materials widely used in outdoor conditions; however, the appearance and mechanical properties of WPCs change with exposure to weather. In this study, high-density polyethylene-based flat-pressed WPCs are reinforced with carbon and glass fibre-woven fabrics for uses where high mechanical properties are needed in outdoor conditions. For this purpose, WPCs are exposed to accelerated weathering conditions to determine the effect of weathering with and without reinforcement. The results show that, after weathering, colour changes are inevitable for WPCs. Attenuated total reflection–Fourier transform-infrared analysis reveals the changes in the matrix's chemical structure, illustrating the alterations in WPC surface characteristics. The mechanical properties of WPCs decrease as a result of photodegradation. However, the reinforced WPCs have higher mechanical properties than the control samples, despite extensive degradation. Carbon fibre (200 g/m2) achieved the greatest flexural strength and modulus of elasticity, 150% and 122% higher, respectively, than unreinforced WPCs. Scanning electron microscopy analysis shows that, despite the intensive photodegradation on the surface, the integration of the matrix and woven fabrics was still strong. The surface erosion was observed with light microscopy. The visual appearance also exhibited some changes that occurred on the surface of WPCs. Note de contenu : - MATERIALS AND METHODS : Materials - Composite processing - Accelerated UV weathering test - Colour measurement - ATR–FTIR spectroscopy analysis - Flexural testing and modulus of elasticity - Microscopic analysis - RESULTS AND DISCUSSION : Colour change - ATR–FTIR spectroscopy analysis - Flexural properties and MOE - Visual appearance - Microscopic images - Table 1 : Changes in the wood index after weathering - Table 2 : Changes in the flexural properties of wood-plastic composites after weathering DOI : https://doi.org/10.1111/cote.12572 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12572 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37500 [article]

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The effect of zinc oxide nanoparticles on the weathering performance of wood-plastic composites / Sefa Durmaz in COLORATION TECHNOLOGY, Vol. 139, N° 4 (08/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 4 (08/2023) . - 430-440 Titre : The effect of zinc oxide nanoparticles on the weathering performance of wood-plastic composites Type de document : texte imprimé Auteurs : Sefa Durmaz, Auteur ; Ozlem Ozgenc Keles, Auteur ; Ugur Aras, Auteur ; Yusuf Ziya Erdil, Auteur ; Fatih Mengeloglu, Auteur Année de publication : 2023 Article en page(s) : 430-440 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Analyse spectrale Colorimétrie Composites à fibres -- Additifs Composites à fibres -- Détérioration Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Composites à matrice organique Essais accélérés (technologie) Microscopie Nanoparticules Oxyde de zinc Réflexion totale atténuée Résistance au rayonnement ultraviolet Solidité de la couleur Statistique Index. décimale : 667.3 Teinture et impression des tissus Résumé : In recent years, wood-plastic composites (WPCs) have become among the most popular engineering materials. Most of their usage areas are outdoors, where they encounter various damaging factors. The weathering conditions cause significant deterioration to WPC surfaces, which negatively influences their service life. In this study, zinc oxide nanoparticles at different concentrations (1%, 3%, 5%, 10%) were added to a high-density polyethylene-based WPC matrix. The effect of zinc oxide nanoparticles on the weathering performance of WPC was evaluated after 840 hours of an artificial weathering test. The highest colour changes (∆E*) were monitored with control samples exposed for 840 hours. Adding zinc oxide nanoparticles improved the ultraviolet (UV) resistance and decreased the colour changes. The wood flour content also affected the colour changes on the WPC surface. A combination of 10% zinc oxide nanoparticles and 50% wood flour content provided the lowest colour changes. The barrier effect of nanoparticles protected the WPC surfaces from UV light. Zinc oxide nanoparticles also positively affected the load transfer, which restricted the reduction in mechanical properties after the weathering test. The degradation on the surface of WPCs was also investigated using attenuated total reflectance-Fourier Transform–infrared analysis. The changes in the characteristic bands of polymer and wood indicated that surface degradation was inevitable. Light and scanning electron microscopy images also demonstrated micro-cracks and roughness on the surface of WPCs. It is concluded that UV degradation is unavoidable, but zinc oxide nanoparticles can improve surface resistance against weathering conditions. Note de contenu : - EXPERIMENTAL : Materials - WPC production - Accelerated UV weathering test - Colour measurement - ATR-FTIR spectroscopy analysis - Mechanical properties - Microscopic analysis - Statistical analysis - RESULTS AND DISCUSSION : Mechanical properties - Colour changes - ATR-FTIR spectroscopy analysis - Light microscopy analysis - Scanning electron microscopy analysis - Table 1 : The wood flour, polymer and nanoparticle content - Table 2 : The mechanical properties of WPCs DOI : https://doi.org/10.1111/cote.12666 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12666 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39680 [article]

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