[article]
| Titre : |
Preparation of UV-opaque, Vis-transparent acrylic–silica nanocomposite coating with promising physico-mechanical properties via miniemulsion polymerization |
| Type de document : |
texte imprimé |
| Auteurs : |
Ali Gharieh, Auteur ; Abdolreza Mirmohseni, Auteur ; Manouchehr Khorassani, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 781-789 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Latex
Matériaux hybrides
Miniémulsions
Nanoparticules
Opacité (optique)
Polyacryliques
Polymérisation en émulsion
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés optiques
Revêtements -- Propriétés physiques
Revêtements en phase aqueuse
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Transparence (optique)
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Here, waterborne coatings with enhanced physico-mechanical properties were prepared by incorporation of modified silica nanoparticles into an acrylic matrix through miniemulsion polymerization. In order to circumvent the inherent incompatibility of organic and inorganic portions, methylene diphenyl diisocyanate and 2-hydroxyethyl methacrylate molecules were chemically coupled to the surface of silica nanoparticles to alter the hydrophilic nature of inorganic nanoparticles to hydrophobic ones. Also, for investigating the effect of the exploited surface modification process, unmodified silica nanoparticles were used in preparing acrylic latex via miniemulsion polymerization. The optical and physico-mechanical properties of the acrylic–silica nanocomposite films with 0–10 wt% of unmodified and modified SiO2 were characterized by measuring their surface roughness, haziness, gloss values, UV–Vis transmittance, scratch resistance, tensile, and pendulum hardness. It was found that by using modified SiO2 nanoparticles, due to their better dispersion state and ability for establishing covalent linkage with acrylic polymer chains, it is possible to obtain nanocomposite coatings with improved physico-mechanical properties, high transparency in Vis region, considerable UV adsorption, and comparable surface roughness, glossiness, and haziness with pure acrylic film. However, unmodified silica nanoparticles formed many aggregates in the polymer matrix which deteriorated optical and different physico-mechanical properties of acrylic latex. It was found that the greatest improvement in properties is achieved by incorporation of 7 wt% modified silica nanoparticles in acrylic polymer. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Chracterization - Preparation of silica-acrylic nanocomposite latexes
- RESULTS AND DISCUSSION : Optical properties - Physico-mechanical properties |
| DOI : |
10.1007/s11998-018-00155-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00155-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32590 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 781-789
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Preparation of UV-opaque, Vis-transparent acrylic–silica nanocomposite coating with promising physico-mechanical properties via miniemulsion polymerization in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
