Comparative release rates from controlled release polymer coatings—comparisons between models and experiment / Prakash S. Sane in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 1193-1200 Titre : Comparative release rates from controlled release polymer coatings—comparisons between models and experiment Type de document : texte imprimé Auteurs : Prakash S. Sane, Auteur ; Kumar Ghosh Swapan, Auteur ; Donald Sundberg, Auteur Année de publication : 2019 Article en page(s) : p. 1193-1200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Etudes comparatives Revêtements -- Additifs:Peinture -- Additifs Revêtements antisalissures:Peinture antisalissures Revêtements organiques Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Controlled release devices and coatings are used heavily in widely varying applications. Here, we focus on applications to antifouling coatings by adding an active agent to polymeric coatings. Quantitative models were developed for four distinctively different methods of dispersing the active agent in the coating. The predicted release rates from these models were contrasted to reveal the inherent differences in the time-dependent release rate profiles achievable from these types of coatings. The majority of these four coatings (monolithic, dispersed particle and reservoir membrane) release the active agent with greatly varying rates over their effective lifetimes, while a microcapsule-based coating has the potential to produce relatively constant rates of release. While the models are potentially of great value, they require a number of parameters, particularly the diffusion coefficient of the active agent through the polymer, to be quantified. We demonstrate how such parameters can be quantified through release rate measurements from simple experimental coatings. Note de contenu : - MODELING FRAMEWORK : Monolithic coatings - Dispersed particle coatings - Reservoir membrane coatings - Microcapsule-based coatings - EXPERIMENTAL WORK : Materials - Emulsion polymerization - Typical paint preparation - Characterization - RESULTS AND DISCUSSION : Comparative release rates from different types of coatings - Experimental release rates DOI : 10.1007/s11998-019-00226-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00226-1.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32873 [article]

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Fundamental studies on morphology control for latex systems with application to waterborne coatings : the effect of polymer radical mobility in latex particles during polymerization / Jeffrey M. Stubbs in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 938 (03/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 938 (03/2003) . - p. 59-67 Titre : Fundamental studies on morphology control for latex systems with application to waterborne coatings : the effect of polymer radical mobility in latex particles during polymerization Type de document : texte imprimé Auteurs : Jeffrey M. Stubbs, Auteur ; Donald Sundberg, Auteur Année de publication : 2003 Article en page(s) : p. 59-67 Note générale : Bibliogr. Langues : Américain (ame) Tags : Transfert  chaîne  Amorceur  Microscopie  électronique  transmission  Liant  Polymérisation  émulsion  Morphologie  Particule  colloïdale  Latex  Peinture  eau  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : This work reports on the development of composite latex particle morphology in seeded, semicontinuous emulsion polymerization. Previous work has explained particle morphology development in terms of the ability of second stage polymer radicals to diffuse into, or penetrate, the seed particles. This article investigates two separate effects that essentially alter the mobility of the second stage polymer radicals. The first is the initiator type, specifically nonionic versus ionic initiators, and the second is the use of chain transfer agent (CTA). It is shown that ionic initiators make it more likely to obtain core shell morphologies by decreasing the penetration of radicals, but only under a narrow set of conditions. Chain transfer agents, on the other hand, allow for more deviation from core shell morphologies by increasing the penetration of radicals, but significant changes were only observed at the highest concentration of CTA studied. Therefore, both factors are fairly subtle and effects are only observed under specific conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5597 [article]

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Latex produced with carboxylic acid comonomer for waterborne coatings : Particle morphology variations with changing pH / Daisuke Fukuhara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 7 (07/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 509-516 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3798 [article]

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