| Titre : |
A study of acetoacetoxyethyl methacrylate hydrolysis in acrylic latex polymers as a function of pH |
| Type de document : |
texte imprimé |
| Auteurs : |
Kebede Beshah, Auteur ; Wayne Devonport, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 821-828 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Énamine
Hydrolyse
Latex
Liants
Méthacrylate d'acétoacétoxyéthyle
pH
Polyacryliques
Réticulation (polymérisation)
Revêtements
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Acetoacetoxyethyl methacrylate (AAEM) is an ambient crosslinking monomer that, when incorporated into architectural coatings binders, provides coatings with improved hardness, scrub, stain, and dirt pick-up resistance. This study details the use of NMR spectroscopy to explore the hydrolysis profile of AAEM as a function of pH, type of neutralizer, and glass transition temperature of the binder. We have determined that AAEM has a hydrolysis profile that is independent of latex polymer pH relevant to coatings (pH 7–10). Lower T g latex polymers enable the diffusion of ammonia into the binder nanoparticles converting a larger amount of the acetoacetoxy moiety to the enamine form; this approach also allows for measuring the distribution of enamine and AAEM form in the latex polymer particle. The consequence of these findings is that AAEM may be utilized at a lower pH than previously envisioned without consequence to the hydrolysis profile of the acetoacetoxy functionality. |
| Note de contenu : |
- 2D NMR signal assignment
- Room temperature aging of high Tg latex polymer (Tg=38°C)
- AAEM hydrolysis of high Tg (38°C) latex polymer neutralized by hard base (NaOH)
- Room temperature aging of low Tg (7°C) latex polymer
- Dependence of enamine formation Tg of the latex polymer |
| DOI : |
10.1007/s11998-013-9512-4 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9512-4.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19821 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 6 (11/2013) . - p. 821-828
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