[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
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