| Titre : |
A comparative study of grafting steps on the preparation and properties of modified nanosilica for UV-curable coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Jianbing Wu, Auteur ; Lixia Ling, Auteur ; Guozhang Ma, Auteur ; Baojun Wang, Auteur |
| Année de publication : |
2014 |
| Article en page(s) : |
p. 717-726 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acrylsilane
Greffage (chimie)
Nanoparticules
Réticulation (polymérisation)
Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet
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.
Traîtements de surface
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Nanosilica was modified and functionalized with acrylsilane by the “grafting to” method via different grafting steps, i.e., prepared-grafting step and step-wise propagation. The prepared-grafting step was achieved by grafting the nanosilica surface with the prepared acrylsilane, which was obtained by thiol-ene click reaction between 3-mercaptopropyl trimethoxysilane (MPTMS) and trimethylolpropane triacrylate (TMPTA). The step-wise propagation was achieved by first grafting MPTMS onto the nanosilica surface and then using the mercapto groups as initiators to react with TMPTA. The acrylsilane was characterized by FTIR. The modified nanosilica was characterized by FTIR, TGA, and contact angle analysis. It was demonstrated that the thiol-ene click reaction can easily occur between MPTMS and TMPTA. The grafting ratio of modified nanosilica via prepared-grafting step was higher than that of step-wise propagation. The SEM images of fractured films containing modified nanosilica also indicated that the former is more effective than the latter in reducing the self-aggregation of nanosilica. The effects of modified nanosilica on the viscosity and hardness of UV-curable coatings were also investigated. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Grafting acrylsilane to nanosilica surface via prepared-grafting step - Grafting acrylsilane to the nanosilica surface via step-wise propagation - Preparation of UV-curable coatings - Characterizations and measurements
- RESULTS AND DISCUSSION : Preparation and characterization of acrylsilane - The difference in preparation of modified nanosilica via different steps - The dispersion of modified nanosilica in the UV-curable coatings - Effect of modified nanosilica on the viscosity of UV-curable coatings - Effect of modified nanosilica on the hardness of UV-curable coatings |
| DOI : |
10.1007/s11998-014-9593-8 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9593-8.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22054 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 5 (09/2014) . - p. 717-726
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