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Ultraviolet chambers based on integrating spheres for use in artificial weathering / Joannie W. Chin in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 929 (06/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 929 (06/2002) . - p. 39-44 Titre : Ultraviolet chambers based on integrating spheres for use in artificial weathering Type de document : texte imprimé Auteurs : Joannie W. Chin, Auteur ; Eric Byrd, Auteur ; Ned Embree, Auteur ; Jonathan Martin, Auteur ; J. D. Tate, Auteur Année de publication : 2002 Article en page(s) : p. 39-44 Note générale : Bibliogr. Langues : Américain (ame) Tags : Appareillage  essai  Polymère  Irradiation  UV  Essai  vieillissement  accéléré  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Laboratory ultraviolet (UV) chambers are widely used to obtain weathering data for a wide range of commercial polymer products including coatings, textiles, elastomers, plastics, and polymeric composites. Although numerous improvements have been made in the design of UV chambers over the last 80 years, the reproducibility of the exposure results from these chambers has remained elusive. This lack of reproducibility is attributed to systematic errors in their design, operation, and control which prevent direct comparisons of the performance of materials exposed in the same environment, comparisons of the performance of the same material exposed in different laboratories, and the comparison of field and laboratory results. This paper describes an innovative UV chamber design based on integrating sphere technology that greatly reduces the magnitude of these errors, as well as provides additional experimental capabilities. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5645 [article]

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Dynamic simulations of a self-polishing antifouling paint exposed to seawater / Søren Kiil in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 929 (06/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 929 (06/2002) . - p. 45-54 Titre : Dynamic simulations of a self-polishing antifouling paint exposed to seawater Type de document : texte imprimé Auteurs : Søren Kiil, Auteur ; Kim Dam-Johansen, Auteur ; Claus Erik Weinell ; Michael Pedersen (S.) ; Santiago Arias Codolar Année de publication : 2002 Article en page(s) : p. 45-54 Note générale : Bibliogr. Langues : Américain (ame) Tags : Autopolissage  Protection  antisalissure  Modèle  dynamique  Simulation  numérique  Modélisation  Libération  Biocide  Eau  mer  Navire  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A mathematical model for a self-polishing antifouling paint exposed to seawater was extended to handle dynamic simulations. The aim has been to investigate, quantitatively, the transient responses of the paint to changes in seawater temperature, pH, concentration of NaCl, and ship speed. The simulation study revealed that polishing and biocide release rates for a paint present on a ship bottom rarely reach stable conditions, because of the slow response of the paint to changes in temperature and ship speed. It was also found that the paint behavior stabilizes more rapidly from a temperature or speed increase than from temperature or speed reductions. These results are essential for the testing of paints on ships and useful information in the development of novel self-polishing antifouling paints. The modeling approach underlying the simulations can be applied to any type of self-polishing antifouling paint provided that sufficient kinetic, solubility, and diffusivity data are available for the pertinent rate steps influencing the paint behavior. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5646 [article]

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Study of film properties of some urethane oils / F. Seniha Güner in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 929 (06/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 929 (06/2002) . - p. 55-59 Titre : Study of film properties of some urethane oils Type de document : texte imprimé Auteurs : F. Seniha Güner, Auteur ; A. Gümüsel, Auteur ; S. Calica, Auteur ; A. Tuncer Erciyes, Auteur Année de publication : 2002 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Alkyde  résine  comparative  Adhérence  Flexibilité  Dureté  Résistance  chimique  eau  Feuil  Propriété  mécanique  physique  Viscosité  rhéologique  Formulation  Isocyanate  organique  Huile  tournesol  Corps  gras  végétal  Uréthanne  polymère  Liant  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, sunflower oil-based urethane oils were obtained from three kinds of isocyanate components: toluene diisocyanate (TDI), hexamethylene diisocyanate (HMDI) and poly(1,4-butandiol) toluene 2,4-diisocyanate (PBTDI) terminated prepolymer. The polymers were prepared at four different ratios of isocyanate component/oil. Sunflower and linseed oil alkyd resin samples were also prepared as the comparative samples. The results suggest that the viscosity and the film properties of urethane oils depend on the amount and type of isocyanate component. The increase in isocyanate content of the urethane oils caused high viscosity. In comparison with the samples having the same oil content, PBTDI-based samples showed the highest viscosity. Viscosity of the polymers can dramatically affect some film properties. For example, high polymer viscosity caused short drying time. In comparision of alkali and water resistances of urethane oils with those of alkyd resins, better results were obtained depending on the structure of the urethane oils. On the other hand, alkyd resins and TDI-based polymers exhibited the best hardness properties. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5647 [article]

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