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Fracture toughness of inorganic-organic hybrid coatings / R. L. Ballard in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 913 (02/2001)
[article]
Titre : Fracture toughness of inorganic-organic hybrid coatings Type de document : texte imprimé Auteurs : R. L. Ballard, Auteur ; R. A. Sailer, Auteur ; B. Larson, Auteur ; Mark D. Soucek, Auteur Année de publication : 2001 Article en page(s) : p. 107-114 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Polymère organominéral Propriété mécanique Feuil Ténacité Energie rupture Alkyde résine Alcoolate Titane Composé organique Zirconium Procédé sol gel Analyse thermomécanique Résistance propagation fissure Eprouvette entaillée Essai traction Etude expérimentale isopropanolate propanolate hybride Index. décimale : 667.9 Revêtements et enduits Résumé : The concepts of fracture toughness and the energy release rate at fracture for thin polymeric films are introduced. Fracture toughness and energy release rate data for ceramer films based on a linseed oil alkyd, a sunflower oil alkyd, and a commercial alkyd with titanium diisopropoxide bis(acetylacetonate), titanium(IV) isopropoxide, and zirconium(IV) propoxide are presented and compared to previously reported tensile data. Differences between the fracture data and the tensile data demonstrate the usefulness of fracture toughness testing. The energy release rate at fracture may be the one property to maximize in order to optimize all of the other coating properties. It may therefore be a great aid in the optimization of coating formulations. Data, from dynamic mechanical thermal analysis indicate that there may be a correlation between fracture properties and secondary relaxation processes in the films. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5692
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 913 (02/2001) . - p. 107-114[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001221 - Périodique Bibliothèque principale Documentaires Disponible A selective catalyst for two-component waterborne polyurethane coatings / Z. Alex He in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 930 (07/2002)
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Titre : A selective catalyst for two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Z. Alex He, Auteur ; Werner J. Blank, Auteur ; Marie E. Picci, Auteur Année de publication : 2002 Article en page(s) : p. 31-36 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Zirconium Complexe Catalyseur Adjuvant Formulation Peinture eau Uréthanne polymère deux constituants Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : The potential for formulating low VOC, high performance, two-component waterborne isocyanate crosslinked coatings has generated a great deal of interest. The difficulties in formulating these coatings, however, are significant. A major problem associated with such systems is the isocyanate-water side reaction, which can lead to gassing/foaming, loss of isocyanate functionality, low gloss, and a reduced pot life. To compensate for this side reaction, these formulations usually contain a large excess of isocyanate. One novel approach to control the water side reaction is the use of catalysts which selectively catalyze the isocyanate-polyol reaction and not the isocyanate-water reaction. The selectivity of a variety of metal catalysts to catalyze the preferred reaction was measured using an FTIR method. A zirconium complex has shown unusually high selectivity for the isocyanate-polyol reaction in comparison to the standard dibutyltin dilaurate catalyst. This zirconium complex catalyst has been evaluated in several waterborne polyurethane formulations and has demonstrated less gassing/foaming, longer pot life, and higher gloss than dibutyltin dilaurate at equal cure time. The mechanism of catalysis and formulating techniques of this novel zirconium catalyst will be discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5644
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 930 (07/2002) . - p. 31-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001241 - Périodique Bibliothèque principale Documentaires Disponible