| Titre : |
Influence of radical photoinitiator content on UV curing process and UV-cured hybrid sol–gel films |
| Type de document : |
texte imprimé |
| Auteurs : |
Anaïs Even, Auteur ; Guillaume Vignaud, Auteur ; Nadia Guitter, Auteur ; Nathalie Le Bozec, Auteur ; Philippe Tingaut, Auteur ; Yves Grohens, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 333-343 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
AlkylTriméthoxysilane
Matériaux -- Propriétés barrières
Matériaux hybrides
Méthacrylates
Nanostructures
Photoamorceurs (chimie)
Photoréticulation
Polyaddition
Revêtements -- Propriétés thermomécaniques
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Sol-gel, Procédé
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Hybrid sol–gel coatings are widely used as protective layers for aluminum alloys because of their barrier abilities. This study aims at explaining the barrier properties of a sol–gel coating based on alkyltrimethoxysilane and methacrylate resin by its film structure. This approach was examined by modifying one photopolymerization parameter, e.g., by varying the content of radical photoinitiator. By neutral salt spray test and electrochemical impedance spectroscopy, the barrier properties are highlighted. The film structure is related to thermomechanical properties of films whose glass transition temperature and elastic modulus are measured by dynamic mechanical analysis and nanoindentation, respectively. On a finer scale, conversion of methacrylate functions calculated from Fourier transform infrared spectroscopy has given information on the chemical structure of films. The morphology of these coatings is studied by scanning electron microscopy, transmission electron microscopy, atomic force microscopy operating in tapping mode, and X-ray diffraction. Results revealed that formulations containing between 3 and 9 wt% of radical photoinitiator exhibit the maximal conversion of methacrylate functions and, at a microscopic scale, a homogeneous coating where the two organic and inorganic networks are well interpenetrated. This hybrid sol–gel microstructure corresponds to the highest glass transition temperature and the highest mechanical characteristics (elastic modulus, E and hardness, H) and the highest protection performance. This results in the best barrier properties, and thus the highest corrosion resistance. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Film preparation - Methods
- RESULTS AND DISCUSSION : Aspect - Barrier properties - Thermomechanical properties - Hybrid micro and nanostructure of UV-cured films |
| DOI : |
https://doi.org/10.1007/s11998-019-00276-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-019-00276-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33985 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 333-343
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Influence of radical photoinitiator content on UV curing process and UV-cured hybrid sol–gel films in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
