Aqueous acrylic-polyurethane hybrid dispersions and their use in industrial coatings / Charles R. Hegedus in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 860 (09/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 860 (09/1996) . - p. 39-48 Titre : Aqueous acrylic-polyurethane hybrid dispersions and their use in industrial coatings Type de document : texte imprimé Auteurs : Charles R. Hegedus, Auteur ; Kristen A. Kloiber, Auteur Année de publication : 1996 Article en page(s) : p. 39-48 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Liants Polyacryliques Polymères en émulsion Polyuréthanes Réseaux polymères Revêtements Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements -- Propriétés thermiques:Peinture -- Propriétés thermiques Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic and polyurethane aqueous dispersions have been used extensively in coating applications, both independently and as physical blends. The resulting coatings display a balance of properties from the inherent characteristics of acrylics and polyurethanes. Nonetheless, these properties often fall short of those predicted front the traditional rule of mixtures. In contrast, a process has been developed whereby acrylic monomers and urethane prepolymers are intimately mixed and mutually polymerized in an aqueous dispersion, thereby resulting in hybrid polymer dispersions. This process causes an interpenetrating network (IPN) of the polymers which subsequently display unique properties compared to standard acrylic, polyurethane, or macroscopically blended acrylic/urethane dispersions. These properties appear to be directly attributable to the acrylic-polyurethane hybrid morphology. Note de contenu : - EXPERIMENTAL : Materials - Procedures - RESULTS AND DISCUSSION : Thermal properties - Surface topography - Clear coating properties - Pigmented coating properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18440 [article]

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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)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 2 (06/2008) . - p. 233-239 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 Vernis Index. 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2999 [article]

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Characterization of particle coalescence in waterborne coatings using atomic force microscopy / R. M. Rynders in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 845 (06/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 845 (06/1995) . - p. 59-69 Titre : Characterization of particle coalescence in waterborne coatings using atomic force microscopy Type de document : texte imprimé Auteurs : R. M. Rynders, Auteur ; Charles R. Hegedus, Auteur ; Andrew G. Gilicinski, Auteur Année de publication : 1995 Article en page(s) : p. 59-69 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Coalescence (Sciences physiques) Microscopie à force atomique Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Atomic force microscopy (AFM) was used to image coatings formed from blends containing various ratios of three waterborne acrylic/polyurethane hybrid polymers. Tapping and contact mode AFM were evaluated for this application, and tapping mode proved to be the best method due to the low friction forces. It was shown that when the tip and feature sizes were similar, the superposition of the tip morphology on the surface features in the AFM image was significant. AFM imaging of gold colloids dispersed on mica and scanning electron microscopy of the tip were used to characterize the AFM tips. A method was developed to estimate the tip radii; in turn, the tip size was accounted for in analyzing the dimensions of the coating surface features. The degree of particle coalescence was evaluated from the AFM images. The polymer blends were ranked according to the degree of particle coalescence; and the results correlated well with other methods of characterization. Note de contenu : - INTRODUCTION : Coating performance issues - AFM imaging issues - EXPERIMANTAL : Coating sample preparation - Atomic force microscopy - Scanning electron microscopy - Electrochemical impedance spectroscopy - Prohesion cabinet exposures - RESULTS AND DISCUSSION : Part I : evaluation of imaging methods - Part II: evaluation of polymer film formation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18517 [article]

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Film formation mechanism of two-component waterborne polyurethane coatings / Charles R. Hegedus in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 852 (01/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 852 (01/1996) . - p. 51-61 Titre : Film formation mechanism of two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Charles R. Hegedus, Auteur ; Andrew G. Gilicinski, Auteur ; Robert J. Haney, Auteur Année de publication : 1996 Article en page(s) : p. 51-61 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coalescence (Sciences physiques) Dispersions et suspensions Formation de film Isocyanates Polyuréthanes Réactions chimiques Revêtements bi-composant:Peinture bi-composant Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Two-component (2K) waterborne polyurethane coatings are a new technology which has been demonstrated in a number of heavy duty applications. They exhibit performance properties equivalent to 2K solvent-borne polyurethanes, with the advantage of reduced volatile organic compounds (VOCs). Although the use of these systems has been demonstrated successfully, the details of their film formation mechanism have not been established. The objective of this work was to propose and confirm the film formation mechanism of these systems. A dynamic series of interrelated events which occur during the process was identified using a number of analytical techniques to study two isocyanate/ hydroxyl functional dispersion systems. The mechanism is presented in terms of an event timeline that chronicles the critical events which occur prior to and after application of the coating. Film property development after application also was evaluated and these results were analyzed in terms of the proposed film formation mechanism. Note de contenu : - BACKGROUND ON FILM FORMATION - PROPOSED FILM FORMATION MECHANISM FOR 2K WATERBORNE POLYURETHANE COATINGS - EXPERIMENTAL : Materials and coating preparation - Equipment and procedures - RESULTS AND DISCUSSION : Particle coalescence in the admixed state - Isocyanate reaction in the admixed state - Evaporation of volatiles and particle coalescence after application - Isocyanate reaction afetr application - Development of film integrity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18310 [article]

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A holistic perspective of coatings technology / Charles R. Hegedus in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 1 (01/2004)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 1 (01/2004) . - p. 5-19 Titre : A holistic perspective of coatings technology Type de document : texte imprimé Auteurs : Charles R. Hegedus, Auteur Année de publication : 2004 Article en page(s) : p. 5-19 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Durée de vie (Ingénierie) Essais accélérés (technologie) Revêtements organiques Revêtements protecteurs Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings are functional materials, working substances. They are used in a wide variety of applications for a great number of reasons. Many of the functions that coatings provide meet essential societal needs. Their advancement has been and will continue to be important to the advancement of technology and society. Holism is the concept that whole entities have an existence other than the mere sum of their parts and that a broader perspective will yield better under-standing and results. A coating is not just a polymer or pigments; a coating system is not just a primer and topcoat acting independently; an end product (i.e., the product to be coated) would not be as valuable without a properly functioning coating system. A coating is a complex material that is often a component of a coating system, which inturn provides added value to a final product. Coatings technology spans a wide spectrum, from the complex interactions and effects of individual paint ingredients, to the design of coating systems to perform specific functions, to the design and manufacture of end products. The focus of this paper is to suggest a holistic perspective of coatings technology, to illustrate that diversity of knowledge, thought, and approach in designing these coatings, coating systems, and final products will yield better science, better coatings and better final products. DOI : 10.1007/s11998-004-0020-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0020-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3928 [article]

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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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Solvent-free urethane-acrylic hybrid polymers for coatings / Ernie C. Galgoci in COATINGS TECH, Vol. 2, N° 13 (02/2005)  

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Waterborne acrylic-epoxy coatings / Charles R. Hegedus in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

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Waterborne polymers for water repellent wood coatings / Charles R. Hegedus in COATINGS TECH, Vol. 3, N° 3 (03/2006)  

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