| 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 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 509-516
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