Method for measuring water diffusion in a coating applied to a substrate / T. Nguyen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 844 (05/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 844 (05/1995) . - p. 37-46 Titre : Method for measuring water diffusion in a coating applied to a substrate Type de document : texte imprimé Auteurs : T. Nguyen, Auteur ; D. Bentz, Auteur ; E. Byrd, Auteur Année de publication : 1995 Article en page(s) : p. 37-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Diffusion (physique) Epoxydes Fourier, Spectroscopie infrarouge à transformée de Perméabilité Polyalkydes Réflectance Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : A method based on Fourier transform infrared-multiple internal reflection (FTIR-MIR) spectroscopy was developed for measuring the apparent diffusion coefficient of water in a coating applied to a substrate. The method requires an appliction of a coating of any thickness on an internal reflection element, which serves as the substrate, with the attachment of a water chamber to the coated specimen. Water is introduced to the chamber and FTIR-MIR spectra are collected automatically without disturbing the specimen or the instrument. The amount of water at the coating/substrate interface was determined using a model based on the theory of internal reflection spectroscopy. A mass-time curve for water at the interface is established, which provides the time-lag value, the time required for water to diffuse through the coating film and reach the interface. The diffusion coefficient (D) is then determined by the time-lag equation. For thick coating films (>25 μm), D may be estimated from the FTIR-MIR in situ intensity data only. The sensitivity of FTIR-MIR spectroscopy and the strong FTIR absorption of water molecules make this an ideal method for measuring the diffusivity of liquid water through a coating applied to a substrate. Note de contenu : - BACKGROUND : Water diffusion in coatings - Fourier transform infrared-multiple internal reflection spectroscopy - RESULTS AND DISCUSSION : Amount of water at the coating/substrate interface - Diffusion coefficient of water in coatings applied to a substrate Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18511 [article]

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