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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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Miniemulsions : Overview of research and applications / Mohamed S. El-Aasser 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. 21-31 Titre : Miniemulsions : Overview of research and applications Type de document : texte imprimé Auteurs : Mohamed S. El-Aasser, Auteur ; E.-D. Sudol, Auteur Année de publication : 2004 Article en page(s) : p. 21-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cinétique chimique Latex Miniémulsions Nucléation Polymères en émulsion Polymérisation Polymérisation en émulsion Index. décimale : 667.9 Revêtements et enduits Résumé : Since their discovery 30 years ago, miniemulsions have been the subject of numerous investigations ranging from the fundamental to the applied. This unique type of oil-in-water emulsion is chiefly characterized by its droplet size and relative stability. High shear is typically applied today to create the small size droplets (anywhere in the range of 50-500 nm) and the combination of a surfactant and a low molecular weight, highly water insoluble costabilizer is used to maintain their stability against collisional and diffusional (Ostwald ripening) degradation. The low molecular weight of the costabilizer is also responsible for the high swelling capacity of the droplets and polymer particles (made by emulsification of polymer solutions, polymerization of monomer miniemulsions, or a combination of these). These features of high stability and swelling capacity distinguish miniemulsions from conventional emulsions and have been exploited to make latexes not possible by conventional emulsification or emulsion polymerization processes. These include artificial latexes made by direct emulsification of a polymer solution followed by removal of the solvent, synthetic latexes made by polymerization of monomer miniemulsions, hybrid latexes made by emulsification of a monomer/polymer solution followed by polymerization, and encapsulated latexes. Most recently miniemulsions have been applied in controlled radical polymerizations whereby relatively narrow molecular weight polymers are produced. In general, our research efforts in miniemulsions have covered the fundamentals of their formation and stabilization, polymerization kinetics, and mechanisms, and look forward to possible applications. An overview of this research is presented here. DOI : 10.1007/s11998-004-0021-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0021-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3929 [article]

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Optimizing nitroxide-mediated miniemulsion polymerization processes / Michael F. Cunningham 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. 33-39 Titre : Optimizing nitroxide-mediated miniemulsion polymerization processes Type de document : texte imprimé Auteurs : Michael F. Cunningham, Auteur ; Barkev Keoshkerian, Auteur ; Marcus Lin, Auteur Année de publication : 2004 Article en page(s) : p. 33-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Latex nitroxydes Polyaddition Polymères en émulsion Polystyrène Index. décimale : 667.9 Revêtements et enduits Résumé : Living/controlled radical polymerizations provide significant advantages in the control of polymer resin microstructure compared to conventional radical polymerization. Advances in our ability to tailor polymer microstructure will enable improvements in coatings properties and possibly new applications of coating technologies. Adapting living radical polymerizations to heterogeneous media such as aqueous-based miniemulsion polymerization presents several challenges related to maintaining the livingness (the fraction of chains that are still living at the end of polymerization) of the polymer chains and also developing a commercially viable process. We have studied the nitroxide-mediated polymerization of styrene in miniemulsion, with the intent of maintaining a high degree of livingness by balancing the rates of biradical termination and disproportination. We can now achieve > 95 % monomer conversion in less than three hours, while maintaining polydispersities ~1.3. Monomer conversion can be dramatically increased from about 60-95 % by changing the concentration of sodium dodecylbenzenesulfonate (SDBS) surfactant. Conversions in Dowfax 8390 stabilized miniemulsions showed no comparable dependency. Reasons for this potentially commercially important effect are under investigation. DOI : 10.1007/s11998-004-0022-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0022-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3930 [article]

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Controlled coagulation of emulsion polymers / Edward Kostansek 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. 41-44 Titre : Controlled coagulation of emulsion polymers Type de document : texte imprimé Auteurs : Edward Kostansek, Auteur Année de publication : 2004 Article en page(s) : p. 41-44 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coagulation Colloides Copolymères en émulsion Copolymérisation Latex Polyacrylate de butyle Polyaddition Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Poudres Index. décimale : 667.9 Revêtements et enduits Résumé : Coagulation of latex particles is most often carried out in the diffusion limited aggregation (DLA) regime where the time for coagulation to take place is on the millisecond timescale. This process produces aggregates of low density, irregular shape, and a broad particle size distribution. When the coagulation is carried out in the reaction limited aggregation (RLA) regime, a coagulation time of about 1-120 sec, the system can be controlled by mixing to yield dense, spheroidal aggregates with a very narrow particle size distribution. The important variables in the RLA process for butyl acrylate/methyl methacrylate (BA/MMA) latexes were found to be mixing intensity, latex copolymer composition, and coagulation temperature. Dried aggregates formed in the RLA process were found to have excellent powder flow properties and low dustiness. DOI : 10.1007/s11998-004-0023-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0023-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3931 [article]

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Knowledge-based control of emulsion polymerization : Tailoring adhesive properties / Oihana Elizalde 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. 45-51 Titre : Knowledge-based control of emulsion polymerization : Tailoring adhesive properties Type de document : texte imprimé Auteurs : Oihana Elizalde, Auteur ; Jose M. Asua, Auteur ; Jose R. Leiza, Auteur ; Christophe Plessis, Auteur ; Matias Vicente, Auteur Année de publication : 2004 Article en page(s) : p. 45-51 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Chromatographie sur gel Colles:Adhésifs Colloides Copolymère styrène acrylate de butyle Emulsions Latex Polyaddition Index. décimale : 667.9 Revêtements et enduits Résumé : An on-line control strategy to produce copolymer latexes with desired adhesive properties (resistance to shear and resistance to peel) has been developed. The strategy required a quantitative model relating adhesive properties and molecular weight distribution that was built using partial least squares regression. The model was used to determine the set-point trajectories of the monomers and chain transfer agent that are used as manipulated variables in the control strategy. The control strategy was experimentally verified to produce an n-butyl acrylate/styrene copolymer latex with a resistance to shear of 1310 s and resistance to peel of 3.1 N/100 mm. DOI : 10.1007/s11998-004-0024-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0024-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3932 [article]

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Particle morphology development in hybrid miniemulsion polymerization / John G. Tsavalas 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. 53-63 Titre : Particle morphology development in hybrid miniemulsion polymerization Type de document : texte imprimé Auteurs : John G. Tsavalas, Auteur ; F. Joseph Schork, Auteur ; Katharina Landfester, Auteur Année de publication : 2004 Article en page(s) : p. 53-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cinétique chimique Core-Shell Latex Miniémulsions Morphologie (matériaux) Polyaddition Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Index. décimale : 667.9 Revêtements et enduits Résumé : Incompatibility between polymer phases resulting from hybrid miniemulsion polymerization of acrylic monomers in the presence of alkyd resin leads to interesting particle morphologies. In this paper, morphology was deduced through cross-comparison of results from several forms of microscopy. For the combination of methyl methacrylate and alkyd, a derivative of core/shell morphology was observed through the combination of transmission electron microscopy, scanning electron microscopy, and spin diffusion NMR. A raspberry-like shall was found to form on the hybrid particle surface consisting of a full coverage of small (roughly 25 nm) polymethyl methacrylate spheres anchored to the particle surface through grafting with the alkyd core. Migration of the spheres to that surface is thought to be induced by phase separation, and the size of the spheres precludes their origin from homoparticles from homogeneous nucleation. Homopolymethyl methacrylate particles were also detected in the particle distribution, resulting from the aqueous-phase initiator and hydrophilicity of methyl methacrylate monomer. For copolymer/alkyd systems (either methyl methacrylate/butyl acrylate/acrylic acid/alkyd or methyl methacrylate/butyl acrylate/alkyd), more traditional core/shell morphologies were observed with a lesser degree of homonucleated particles. A significantly different result was found in the combination of butyl acrylate and alkyd, resulting in a continuous particle-phase of polylbutyl acrylate and small internally dispersed island domains of alkyd. This is likely due to the lesser incompatibility between polybutyl acrylate and alkyd along with their similar hydrophobicity and glass transition temperatures. A higher degree of grafting between the alkyd and polybutyl acrylate also contributed to the compatibility between the two components, when compared to hybrid methyl methacrylate/alkyd systems. DOI : 10.1007/s11998-004-0025-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0025-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3933 [article]

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Preparation of polymerizable miniemulsions by ultrasonication / Katharina Landfester 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. 65-68 Titre : Preparation of polymerizable miniemulsions by ultrasonication Type de document : texte imprimé Auteurs : Katharina Landfester, Auteur ; Jördis Eisenblätter, Auteur ; Regina Rothe, Auteur Année de publication : 2004 Article en page(s) : p. 65-68 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cinétique chimique Colloides Latex Polyacryliques Polyaddition Polymères en émulsion Polystyrène Sonochimie Index. décimale : 667.9 Revêtements et enduits Résumé : Styrene miniemulsions are prepared by ultrasonicating a system at different amplitudes until an equilibrium is reached. It is shown by turbidity measurements that the efficiency of the dispersion process is strongly dependent upon the ultrasonication time at the different amplitudes. In addition, the influence of monomer type on the homogenization process is also shown. The sizes of the droplets (before and after polymerization of the particles) are mainly determined by the type of monomer as well as the type and amount of the surfactant, as is shown for methyl methacrylate and butyl acrylate as monomers. DOI : 10.1007/s11998-004-0026-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0026-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3934 [article]

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