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Partager le résultat de cette rechercheAnalytical investigations on acrylic polyurethane hybrid - dispersions / H. Kagerer in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)
Titre : Analytical investigations on acrylic polyurethane hybrid - dispersions Type de document : texte imprimé Auteurs : H. Kagerer, Auteur ; H. U. Moritz, Auteur ; H. P. Rink, Auteur ; W. A. Jung, Auteur Année de publication : 2002 Article en page(s) : p. 63-67 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Analyse chimique Liaison double Copolymérisation radicalaire Matériau hybride Copolymère greffé Uréthanne copolymère Acrylate Dispersion aqueuse Peinture eau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Water-dispersible polyurethane acrylic graft copolymers are an important class of hybrid polymers for use as resins in waterborne coatings. In order to study fundamental properties of such polymers, a model system of four polyurethane macromonomers that differ in the average number of double bonds per molecule was developed. Free radical copolymerization of the polyurethane macromonomers with acrylates was carried out in aqueous phase using the polyurethanes as the reactive emulsifier. The stability of the product dispersions depends on the average number of double bonds per macromolecule and the weight ratio of hydrophilic polyurethane to the acrylic part. The content of the polyurethane double bonds and their conversion was measured by nuclear magnetic resonance (NMR) spectroscopy and by a titrimetrical method. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5669
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 63-67[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001238 - Périodique Bibliothèque principale Documentaires Disponible 
Titre : Chitosan-hybridized acrylic resins prepared in emulsion polymerizations and their application as interior finishing coatings Type de document : texte imprimé Auteurs : Tamaki Wada, Auteur ; Yasuhiro Matoba, Auteur ; Tadashi Uragami, Auteur Année de publication : 2005 Article en page(s) : p. 577-582 Note générale : Bibliogr. Langues : Américain (ame) Tags : Oside polymère Etude expérimentale Formaldéhyde Composé organique volatil Capacité adsorption Propriété mécanique Latex Relation mise en oeuvre propriété Résistance traction Copolymérisation radicalaire esthétique émulsion Préparation Matériau revêtement Vernis eau Acrylique dérivé copolymère Mélange Chitosane Index. décimale : 667.9 Revêtements et enduits Résumé : Chitosan was used to introduce formaldehyde adsorption abilities into an emulsion binder for interior finishing coatings. Chitosan-hybridized acrylic emulsions were prepared by two methods. To produce stable chitosan-hybridized acrylic emulsions, the pre-emulsion dropping method is superior to the monomer dropping method. The adsorption performances for formaldehyde in chitosan-hybridized acrylic resin films increased with increasing chitosan contents; the films also had adsorption abilities for hydrogen sulfide and ammonia. Tensile strengths and elongation at breaking points decreased with increasing chitosan contents. Interior finishing coatings made from chitosan-hybridized acrylic resin emulsions have the qualities necessary for an interior finishing coating and showed excellent adsorption abilities for formaldehyde. DOI : 10.1007/s11998-005-0017-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0017-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3805
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 577-582[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002327 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Latex produced with carboxylic acid comonomer for waterborne coatings : Particle morphology variations with changing pH Type de document : texte imprimé Auteurs : Daisuke Fukuhara, Auteur ; Donald Sundberg, Auteur Année de publication : 2005 Article en page(s) : p. 509-516 Note générale : Bibliogr. Langues : Américain (ame) Tags : En semi discontinu Particule core shell Modélisation Etude expérimentale Microscopie électronique transmission Méthode étude Cinétique Effet concentration pH Agent surface anionique Méthacrylate de méthyle polymère Relation mise en oeuvre structure Polymérisation ensemencée Acrylate butyle copolymère Styrène Copolymérisation radicalaire Morphologie émulsion Méthacrylique acide Latex Index. décimale : 667.9 Revêtements et enduits Résumé : Carboxylic acid comonomers are often added to latex formulations to improve colloidal stability and to help control the physical structure of composite (core-shell type) particles. We have performed a systematic study of the incorporation of methacrylic acid (MAA) within styrene/butyl acrylate copolymer seed latices, and determined the eventual effect on the morphology of the composite particles when using a second-stage monomer that is either polar (MMA) or nonpolar (BMA). These latices have been produced in batch and semibatch reactions in the pH range of 3-7. At low pH, the MAA groups are not ionized, but at the higher pH they may be nearly completely ionized. Here, we report that for batch reactions carried out within the above pH range, the latex particle morphologies of the PMMA second-stage systems change dramatically with increasing pH, while those for the PBMA system do not change at all. These results show that one cannot easily generalize the effect of acid comonomers on the morphology of composite latex particles, as this depends upon the choice of the copolymers in the latex and the process characteristics of the polymerization reaction. DOI : 10.1007/s11998-005-0010-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0010-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3798
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 509-516[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002327 - Périodique Bibliothèque principale Documentaires Disponible
Titre : New high- throughput screening tool for the evaluation of pigmented UV-A curable coatings- : A case study using low energy lamps Type de document : texte imprimé Auteurs : Stephanie Strazisar, Auteur ; Margaret Kendi, Auteur ; Thomas Fäcke, Auteur ; Leoné Hermans-Blackburn, Auteur ; Xudong Sharon Feng, Auteur Année de publication : 2006 Article en page(s) : p. 307-312 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Marquage fluorescent' 'Criblage haut débit' Photoamorceur Cinétique Copolymérisation Photochimie 'Copolymère uréthane acrylate' Index. décimale : 667.9 Revêtements et enduits Résumé : Pigmented UV radiation-curable coatings have been a challenge to the coatings formulator for a long time. A critical match of pigment and photoinitiator package is crucial for good cure. Another issue facing the coatings chemist is the popularity of low energy lamps, which offer ease of handling, reduced safety concerns, and a low price tag. Obviously, the combination of curing pigmented coatings and using low energy lamps poses a special challenge. To improve the pigmented coating development cycle, a rapid workflow was needed to screen formulations for cure under low energy UV-A radiation. For these types of applications, a high-throughput screening assay for discovering desirable photoinitiator packages was developed. Fluorescent dye-doped coatings cured under UV-A radiation were extracted with solvent. The relative degree-of-cure of the film was determined to be inversely related to a combination of the absorbance and fluorescence of the extractant. When this assay is used in conjunction with automated liquid handling and a spectrophotometer with an x-y scanning stage, the coatings formulator can analyze a large variable set in a short period of time. A primary screening of photoinitiators using this workflow suggests Lucirin® TPO-L, Darocur® 4265, and Irgacure® 2100 as optimum choices. DOI : 10.1007/s11998-006-0024-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0027-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3684
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 4 (10/2006) . - p. 307-312[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005756 - Périodique Bibliothèque principale Documentaires Disponible
Titre : New polymeric polyol for thermoset coatings : Superacid-catalyzed copolymerization of water and epoxy resins Type de document : texte imprimé Auteurs : J. Frederic Walker, Auteur ; John B. Dickenson, Auteur ; Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; Renee Keller, Auteur Année de publication : 2002 Article en page(s) : p. 33-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Feuil Propriété mécanique physique chimique Polymérisation solution Ether Bisphénol A Eau Copolymérisation émulsion Polyol Superacide Catalyse acide Epoxyde résine Liant Formulation Thermodurcissable Peinture Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Though free-radical emulsion polymerization has been studied extensively, published reports of cationic (i.e., acid-catalyzed) polymerizations of emulsified monomers are rare. It was recently discovered that treatment of an emulsion of liquid epoxy resin with select superacid catalysts yields a polymeric polyol. Catalysis with one percent perchloric acid at room temperature yields a product with a number average molecular weight of 1650, and a polydispersity of 5.0 as measured by GPC. The polyol's structure differs from that of conventional high molecular weight epoxy resins prepared by the advancement process in several ways, including the incorporation of two glycidyl units in the repeat unit. In essence, the product is a copolymer of the epoxy resin and water, in which water is incorporated in the repeat unit structure by reaction with two epoxide groups. A similar product can be prepared by solution polymerization, where the molecular weight is controlled by the ratio of water to epoxy resin. The product was shown to have lower levels of residual bisphentol-A diglycidyl ether (BADGE) and bisphenol-A than conventional advanced epoxy resins. Polyols prepared by these new processes were crosslinked with melamine-formaldehyde resins in waterborne coating formulations which were free of added cosolvent, as well as solventborne coating formulations. The coatings de veloped excellent solvent resistance at lower bake temperatures than traditional epoxy resins. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5648
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 928 (05/2002) . - p. 33-47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001239 - Périodique Bibliothèque principale Documentaires Disponible
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