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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)

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inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023)

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 phases
Index. 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 fraction
DOI :	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 :	Pdf
Permalink :	https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38778

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