Changes in composition and characteristics of latex paints applied on porous inorganic substrates / Dan Y. Perera in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 919 (08/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 919 (08/2001) . - p. 89-93 Titre : Changes in composition and characteristics of latex paints applied on porous inorganic substrates Type de document : texte imprimé Auteurs : Dan Y. Perera, Auteur ; D. Vanden Eyende, Auteur ; J. M. Borsus, Auteur Année de publication : 2001 Article en page(s) : p. 89-93 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  eau  émulsion  Utilisation  Bâtiment  poreux  Formation  film  Composition  chimique  Relation  composition  propriété  Chromatographie  phase  gazeuse  Analyse  thermique  Liant  Adjuvant  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Changes in film composition and characteristics that occur during and/or immediately after the application of latex paints on porous inorganic substrates were investigated. Gas chromatography (GC) and thermal analysis were among the techniques used for this purpose. The changes in coalescing agent and binder content were determined by GC and thermogravimetric analysis, respectiveely, and the changes in glass transition temperature by differential scanning calorimetry. It was found that the type of porous substrate could significantly affect the paint composition (pigment volume concentration, coalescent level) during the film formation process. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5742 [article]

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Hygrothermal stress evolution during weathering in organic coatings / Dan Y. Perera in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 833 (06/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 833 (06/1994) . - p. 83-88 Titre : Hygrothermal stress evolution during weathering in organic coatings Type de document : texte imprimé Auteurs : Dan Y. Perera, Auteur ; Maarten Oosterbroek, Auteur Année de publication : 1994 Article en page(s) : p. 83-88 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contraintes (mécanique) Copolymère acrylique mélamine Copolymère uréthane acrylique Essais accélérés (technologie) Relaxation des contraintes Vernis -- Effets du climat Index. décimale : 667.9 Revêtements et enduits Résumé : Hygrothermal stresses developing in two clearcoats exposed to two types of accelerated weathering were determined. The physical and chemical changes induced by weathering produce a continuous increase of tensile and compressive stresses which ultimately causes it to crack. It was found that the stress magnitude and the duration of exposure at which the coating cracks depend on the type of the accelerated weathering. Also, the rate of stress relaxation decreases with duration of weathering. However, the shape of curves describing the stress dependence on duration of weathering is the same provided that the main mechanism of coating degradation does not change. When combined with other techniques, the measurement of stress appears to be an important way of studying coating durability (...) Note de contenu : - EXPERIMENTAL: Materials - Accelerated Wheathering - Methods - RESULTS : Physical aging - Type of accelerated Wheathering - Stress relaxation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18652 [article]

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Measurement of stress in multicoat systems / Annelies E. Boerman in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 881 (06/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 881 (06/1998) . - p. 69-75 Titre : Measurement of stress in multicoat systems Type de document : texte imprimé Auteurs : Annelies E. Boerman, Auteur ; Dan Y. Perera, Auteur Année de publication : 1998 Article en page(s) : p. 69-75 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contraintes (mécanique) Couches minces multicouches Modèles mathématiques Revêtements Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : Mathematical relationships to calculate the stress in each layer of a multicoat system are derived. They were verified for a bi- and a trilayer acrylic/melamine system by comparing the thermal stress values determined from the derived equations with those calculated from an equation which requires the knowledge of the layers’ properties (elastic modulus, Poisson’s ratio, and glass transition temperature).Experimental procedures for coating systems unaffected and affected by multiple application and curing are described, and a few cases met in practice are presented. This study should provide a better understanding of the interactions between various layers of a multicoat system, and the damage (delamination, cracking) which might result from them. Note de contenu : - DERIVATION OF MATHEMATICAL RELATIONSHIPS : Single-coat systems - Multicoat systems - USE OF THE EQUATION : Ideal case - Thermally instable coatings - VERIFICATION OF MATHEMATICAL EQUATIONS - PRACTICAL APPLICATION OF THE DERIVED EQUATIONS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18012 [article]

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