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Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation / Michael S. Lowry in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 2 (06/2008)
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Titre : Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation Type de document : texte imprimé Auteurs : Michael S. Lowry, Auteur ; David R. Hubble, Auteur ; Amy L. Wressell, Auteur ; Menas S. Vratsanos, Auteur ; Frank R. Pepe, Auteur ; Charles R. Hegedus, Auteur Année de publication : 2008 Article en page(s) : p. 233-239 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane acrylique
Nanoparticules
Oxyde de zinc
Perméabilité
Protection contre le rayonnement ultraviolet
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : The degree of UV protection afforded by nano-ZnO in a polyurethane/acrylic clear topcoat was investigated. The influence of nano-ZnO concentration and dry film thickness on the optical properties (e.g., UV permeability and visible transmittance) of the coating was probed using a library of 28 samples that were prepared by high throughput techniques. A model for predicting the UV permeability of nano-ZnO filled coatings was developed and the nano-ZnO loading condition required to block >99% UV radiation was determined to be 2.0 g/m2. This model can be used to assist in the development of coatings and other polymeric systems embedded with nano-ZnO to protect the coating and underlying materials (i.e., substrate) from UV degradation. DOI : 10.1007/s11998-007-9064-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9064-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2999
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 2 (06/2008) . - p. 233-239[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010394 - Périodique Bibliothèque principale Documentaires Disponible New polymeric polyol for thermoset coatings / J. Frederic Walker in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 928 (05/2002)
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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 Solvent-free urethane-acrylic hybrid polymers for coatings / Ernie C. Galgoci in COATINGS TECH, Vol. 2, N° 13 (02/2005)
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Titre : Solvent-free urethane-acrylic hybrid polymers for coatings Type de document : texte imprimé Auteurs : Ernie C. Galgoci, Auteur ; Charles R. Hegedus, Auteur ; Frederick H. Walker, Auteur ; Daniel J. Tempel, Auteur ; Frank R. Pepe, Auteur ; Kenneth A. Yoxheimer, Auteur ; Alan S. Boyce, Auteur Année de publication : 2005 Article en page(s) : p. 28-36 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Urethane-acrylic hybrid polymer dispersions (HPDs) can offer cost/performance advantages over common 1K coating materials such as polyurethane dispersions (PUDs), acrylic emulsions, and blends thereof. One disadvantage of both PUDs and HPDs is the inclusion of N-methylpyrrolidone (NMP) solvent, which is commonly a necessary processing solvent included at levels ranging from about 3 to 15%. Since NMP has recently been added to California’s Proposition 65 list and has generally become objectionable for use in Europe, it has become desirable to eliminate NMP from these products. Consequently, solvent-free versions of HPDs have been developed that, despite the lack of NMP used in their preparation, have been found to perform favorably compared to analogous solvent-containing polymers (both hybrid and PUD). Like their solvent-containing counterparts, the outstanding properties of the new solvent-free versions are apparently due to their true hybrid nature, which is analogous to an interpenetrating network (IPN) as indicated by a broad glass transition temperature range. Although the NMP-free versions still require coalescing solvents for adequate film formation, they offer greater flexibility in choosing alternate solvents when formulating high performance coatings. En ligne : https://drive.google.com/file/d/1C-UhcnfFGnnQwkl3TULi-qq4yvotVDtZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5528
in COATINGS TECH > Vol. 2, N° 13 (02/2005) . - p. 28-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000584 - Périodique Bibliothèque principale Documentaires Disponible Waterborne acrylic-epoxy coatings / Charles R. Hegedus in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)
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Titre : Waterborne acrylic-epoxy coatings Type de document : texte imprimé Auteurs : Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; John B. Dickenson, Auteur ; Frederick H. Walker, Auteur Année de publication : 2002 Article en page(s) : p. 31-39 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne two-component acrylic-epoxy coatings are gaining popularity as topcoats in moderate duty industrial and high performance architectural (HIPAC) applications. This increased popularity is due to their attractive handling, application, and performance properties, along with their low solvent content and odor. The objectives of this work were to characterize the cure and property development of these coatings, evaluate performance properties of cured films, and investigate a new epoxy resin dispersion in existing acrylic-epoxy formulations. These evaluations confirmed that existing acrylic-epoxy coatings have long pot life and short dry times while displaying a range of chemical resistance and physical properties. IR and differential scanning calorimetry (DSC) results indicated that the extent of cure at ambient conditions over a 21-day period was minimal; however, dynamic mechanical analysis (DMA) and solvent swell results did illustrate noticeable crosslink density development under these conditions. DSC results demonstrated more complete reaction and cure after heating. Direct substitution of a novel epoxy resin dispersion into these formulas resulted in lower required solvent content, shorter dry time, higher gloss, higher crosslink density, and improved water and scrub resistance. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5665
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Code-barres Cote Support Localisation Section Disponibilité 001238 - Périodique Bibliothèque principale Documentaires Disponible Waterborne polymers for water repellent wood coatings / Charles R. Hegedus in COATINGS TECH, Vol. 3, N° 3 (03/2006)
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Titre : Waterborne polymers for water repellent wood coatings Type de document : texte imprimé Auteurs : Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; John J. Rabasco, Auteur Année de publication : 2006 Article en page(s) : p. 38-52 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polymer emulsions composed of vinyl acetate-ethylene (VAE), ethylene-vinyl chloride (EVCl), and other vinyl acetate copolymers were evaluated as polymer systems in water repellent coatings for exterior wood applications. Data presented indicates that these polymer emulsions exhibit an excellent balance of performance properties, making them the polymer of choice in water repellent coating formulations requiring low volatile organic compound (VOC) content. The data further suggest that polymer morphology and other emulsion polymerization process parameters (e.g., surfactant package, functional comonomers, initiation system, and particle size) may play a role in achieving industry accepted performance. En ligne : https://drive.google.com/file/d/1qYaDTHnN_tznfWkhLhO4YkVj3cesZU6o/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5489
in COATINGS TECH > Vol. 3, N° 3 (03/2006) . - p. 38-52[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003911 - Périodique Bibliothèque principale Documentaires Disponible