[article]
| Titre : |
Graphene oxide/waterborne polyurethane nanocoatings : effects of graphene oxide content on performance properties |
| Type de document : |
texte imprimé |
| Auteurs : |
C. Bernard, Auteur ; D. G. Goodwin, Auteur ; X. Gu, Auteur ; M. Celina, Auteur ; M. Nyden, Auteur ; D. Jacobs, Auteur ; L. Sung, Auteur ; T. Nguyen, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 255-269 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Absorption
Adsorption
Caractérisation
Charges (matériaux)
Inflammabilité
Matériaux hybrides
Oxyde de graphène
Oxygène
Perméabilité
Polymères en émulsion
Polyuréthanes
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse
Revêtements organiques
Thermocinétique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Graphene oxide (GO) is a good nanofiller candidate for waterborne coatings because of its outstanding physical and mechanical properties, good dispersibility in water, and low cost relative to graphene. Here, we report on the performance of a one-part, waterborne polyurethane (WPU) nanocoating formulated with four different GO loadings ([0.4% to 2.0%] by mass). The degree of GO dispersion/adhesion was evaluated using scanning electron microscopy, laser scanning confocal microscopy, and Raman microscopy. Nanocoating performance was evaluated using a dynamic mechanical thermal analyzer for mechanical properties, a customized coulometric permeation apparatus for oxygen barrier properties, a combustion microcalorimeter for flammability, a hot disk analyzer for thermal conductivity, thermogravimetric analysis for thermal stability, and a moisture sorption analyzer for water uptake. The results show that GO sheets were well dispersed in, and have good adhesion to, WPU. At the higher mass loadings ([1.2% or 2%] by mass), GO increased the modulus and yield strength of WPU by 300% and 200%, respectively, increased the thermal conductivity by 38%, reduced the burning heat release rate (flammability) by 43%, and reduced the oxygen permeability by up to sevenfold. The presence of GO, however, increased water vapor uptake at high humidity; the moisture content of 2% mass loading GO/WPU nanocoatings at 90% RH was almost twice that of the moisture content for unfilled WPU. Overall, with the exception of water uptake at very high humidity (> 70% RH), the observed improvements in physical and mechanical properties combined with the ease of processing suggest that GO is a viable nanofiller for WPU coatings. |
| Note de contenu : |
- EXPERIMENTAL MATERIALS AND METHODS : Materials and preparation of GO/WPU nanocoatings - Characterization of GO/WPU nanocoating properties
- RESULTS AND DISCUSSION : Characterization of GO/WPU nanocoating dispersion quality - Mechanical properties - Oxygen permeability - Water sorption of GO/WPU nanocoatings at different relative humidity levels - Flammability - Thermal conductivity |
| DOI : |
10.1007/s11998-019-00267-6 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-019-00267-6.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33743 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 255-269
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