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Reaction-driven solvent transport in UV-curable phase-separating coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)
[article]
Titre : Reaction-driven solvent transport in UV-curable phase-separating coatings Type de document : texte imprimé Année de publication : 2023 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fourier, Spectroscopie infrarouge à transformée de
Lumière -- Diffusion
Microscopie électronique à balayage
Photoréticulation
Polyester acrylate
Réaction de couplage
Réflexion totale atténuée
Revêtement en phase solvant
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Séparation de phasesIndex. décimale : 667.9 Revêtements et enduits Résumé : We experimentally examined the time-evolutions of local compositions in photocurable, monomer-solvent-initiator ternary liquid film coatings using attenuated total-reflectance-Fourier transform infrared spectroscopy. The coatings exhibited phase separation upon UV exposure owing to the inherent partial miscibility between the solvent and the polymer. The solvent concentration at the bottom of the coating increased when exposed to UV light for 1 s from the top, showing a solvent transport along the irradiation direction. The differences in solvent concentration before and after UV exposure showed good agreement with model predictions based on stress-induced non-Fickian solvent mass transport. The solvent concentrations at the bottom remained constant in the case of discrete phase structures, whereas it exponentially decayed over time in bicontinuous phase structures. These results suggest that light-tunable microstructures enable the relaxation of the reaction-driven nonuniformity in solvent concentration distributions. Note de contenu : - Materials
- Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) analysis
- Scanning electron microscopy
- Light scattering analysis
- Table 1 : Material constants to express A1363/A981 as a cubic function with respect to the solvent mass fractionDOI : https://doi.org/10.1007/s11998-022-00661-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00661-7.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38778
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