| Titre : |
Effect of addition of cellulose nanocrystals to wood coatings on color changes and surface roughness due to accelerated weathering |
| Type de document : |
texte imprimé |
| Auteurs : |
Vahe Vardanyan, Auteur ; Tigran Galstian, Auteur ; Bernard Riedl, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 247-258 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Bois
CelluloseLa 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.
Copolymère uréthane acrylate
Couleurs -- Stabilité
Cristaux
Essais accélérés (technologie)
Formulation (Génie chimique)
Nanoparticules
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet
Revêtements:Peinture
Rugosité
Vernis en phase aqueuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
An aqueous ultraviolet-cured polyurethane acrylate transparent resin formulation was submitted for accelerated weathering for 1200 h, on wood substrate, with and without added cellulose nanocrystals (CNC) in coatings. In previous work, addition of CNC improved several mechanical properties of the coating without changing other desirable properties such as optical transparency, color, and gloss. Measurements of nanoroughness were performed with atomic force microscopy on coated weathered surfaces. Surface roughness increased 8–10 times following weathering. Color and lightness measurements were done periodically, each 100 h, during the weathering. Testing was also done for a multilayer coating, varnish on an opaque coating on wood. Addition of unmodified, i.e., hydrophilic, CNC to transparent coatings did not downgrade the color stability of coatings but actually increased their color stability, while the effect on hydrophobically modified CNC was somewhat less. Thus, addition of CNC to coatings not only increases mechanical properties but also increases color stability of coated wood. |
| Note de contenu : |
- INTRODUCTION AND LITERATURE REVIEW : Effect of UV/humidity on color wood surfaces - Effect of UV/humidity on color of coated wood - Effect of addition of nanoparticles in coatings
- EXPERIMENTAL : Varnish formulation - Wood samples preparation - Accelerated weathering
- RESULTS AND DISCUSSION : Wheathering of varnishes with added CNC : color and appearance - Wheathering of paints with added CNC : color and appearance - Changes in roughness following wheathering : AFM profiles |
| DOI : |
10.1007/s11998-014-9634-3 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9634-3.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23644 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 2 (03/2015) . - p. 247-258
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Effect of addition of cellulose nanocrystals to wood coatings on color changes and surface roughness due to accelerated weathering in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)
