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Advances in emulsion polymerization for coatings applications / Mohamed S. El-Aasser in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 920 (09/2001)
[article]
Titre : Advances in emulsion polymerization for coatings applications : Latex blends and reactive surfactants Type de document : texte imprimé Auteurs : Mohamed S. El-Aasser, Auteur ; E.-D. Sudol, Auteur ; Victoria L. Dimonie, Auteur ; Eric S. Daniels, Auteur ; Xiaoru Wang, Auteur ; Jiansheng Tang, Auteur Année de publication : 2001 Article en page(s) : p. 51-63 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture eau émulsion Liant Préparation Polymérisation Latex Mélange Adjuvant Agent surface Distribution dimension particule Propriété optique Feuil Brillant Styrène polymère Groupe carboxyle Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The utilization of latex blends to prepare zero-VOC coatings and the use of reactive surfactants in emulsion polymerization are two advances in waterborne technology that are of increasing interest to coatings formulators. The first part of this paper focuses on an investigation of the influence of the interface between high and two Tg latex particles on the glass and surface morphologies of films obtained from model latex blends. Glass was influenced by the concentration of carboxyl groups present on the surface of the latex particles (optimal concentration for maximum gloss 3% on the high Tg particles), the degree of neutralization of these groups (higher glass with increased extent of neutralization), the type and concentration of the neutralizing base (higher gloss for stronger bases), and the presence of added surfactant (higher gloss with added surfactant). Gloss was found to be correlated with the surface smoothness of the film. The kinetics, particle size, molecular weight, and location of the reactive surfactant after polymerization, as well as the contact angle of films prepared from these latices, are examined in the second part of this paper. The polymerization rate profiles were similar to those obtained using a conventional surfactant ; however, the dependency of the rate on the number of particles was significantly lower. The amount bound increased and the molecular weight decreased with increasing surfactant concentration. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5746
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 920 (09/2001) . - p. 51-63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001228 - Périodique Bibliothèque principale Documentaires Disponible Film formation from conventional and miniemulsion latex systems containing dimethyl meta-isopropenyl benzyl isocyanate (TMI) - a functional monomer/crosslinking agent / Yoshimi Inaba in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 833 (06/1994)
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Titre : Film formation from conventional and miniemulsion latex systems containing dimethyl meta-isopropenyl benzyl isocyanate (TMI) - a functional monomer/crosslinking agent Type de document : texte imprimé Auteurs : Yoshimi Inaba, Auteur ; Eric S. Daniels, Auteur ; Mohamed S. El-Aasser, Auteur Année de publication : 1994 Article en page(s) : p. 63-74 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère styrène acrylate de butyle
Formation de film
Isocyanates
Polymérisation en émulsion
Réticulants
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : A series of model styrene (St)/n-butyl acrylate (BA) copolymer latexes with glass transition temperatures below room temperature were prepared by either conventional or miniemulsion polymerization techniques as model systems for studies of film formation. The functional monomer TMI® (META) (dimethyl meta-isopropenyl benzyl isocyanate) was used as a functional monomer/crosslinking agent. A small amount of methacrylic acid (MAA) was introduced in some formulations to enhance the crosslinking reactions. A redox initiation system was used to reduce premature crosslinking during the polymerization. A combination of an ionic surfactant (sodium lauryl sulfate) and co-surfactant (hexadecane or cetyl alcohol) was used as the mixed emulsifier for the miniemulsion system.
This paper describes the performance of TMI as a crosslinking agent and the effects of the combination of TMI and MAA on the latex film formation process.Note de contenu : - EXPERIMENTAL : Materials - Miniemulsification - Polymerization - Evaluation methods
- RESULTS AND DISCUSSION : Effect of the crosslinking agent concentration - Effect of initiator concentration - Effect of BA/St ratio - Influence of emulsifier concentration and differences between mixed emulsifier systems - Differences between latex film dried from St/BA/TMI/MAA copolymer latex and a blend of St/BA/TMI with St/BA/MAA copolymer latexes with varying TMI/MMA ratiosPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18643
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 833 (06/1994) . - p. 63-74[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003467 - Périodique Bibliothèque principale Documentaires Disponible 003480 - Périodique Bibliothèque principale Documentaires Exclu du prêt