| Titre : |
Optimizing nitroxide-mediated miniemulsion polymerization processes |
| Type de document : |
texte imprimé |
| Auteurs : |
Michael F. Cunningham, Auteur ; Barkev Keoshkerian, Auteur ; Marcus Lin, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 33-39 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Latex
nitroxydes
Polyaddition
Polymères en émulsion
Polystyrène
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Living/controlled radical polymerizations provide significant advantages in the control of polymer resin microstructure compared to conventional radical polymerization. Advances in our ability to tailor polymer microstructure will enable improvements in coatings properties and possibly new applications of coating technologies. Adapting living radical polymerizations to heterogeneous media such as aqueous-based miniemulsion polymerization presents several challenges related to maintaining the livingness (the fraction of chains that are still living at the end of polymerization) of the polymer chains and also developing a commercially viable process. We have studied the nitroxide-mediated polymerization of styrene in miniemulsion, with the intent of maintaining a high degree of livingness by balancing the rates of biradical termination and disproportination. We can now achieve > 95 % monomer conversion in less than three hours, while maintaining polydispersities ~1.3. Monomer conversion can be dramatically increased from about 60-95 % by changing the concentration of sodium dodecylbenzenesulfonate (SDBS) surfactant. Conversions in Dowfax 8390 stabilized miniemulsions showed no comparable dependency. Reasons for this potentially commercially important effect are under investigation. |
| DOI : |
10.1007/s11998-004-0022-2 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0022-2.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3930 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 1 (01/2004) . - p. 33-39
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