| Titre : |
Elucidation of polyurethane dispersions in a batch rotor-stator mixer |
| Type de document : |
texte imprimé |
| Auteurs : |
Supathorn Phongikaroon, Auteur ; Keith Carpenter, Auteur ; Richard V. Calabrese, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 329-335 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Tags : |
Etude expérimentale Cinétique Agitation mécanique Polyaddition Préparation Dispersion aqueuse Uréthanne polymère |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In this study, the effect of high energy input from mechanical agitation, provided with a high shear rotor-stator, on the drop size and the drop size distribution (DSD) of aqueous polyurethane (PU) dispersions is investigated. The effect of the dispersed phase volume fraction (phi) on the DSD of aqueous PU dispersions is also examined to understand the fundamental characteristics that result from the high shear mixing. DSD is measured by using either a high magnification video probe or dynamic light scattering, depending on the range of drop sizes. For the PU without any ionic content, the distributions appear to be bimodal with rather large drop sizes. The mean sizes of the first and second modes are about 10 and 22 µm, respectively. For the PU with an ionic content, the mean drop sizes are approximately 80 nm. The distributions reveal that functional chemistry plays a more dominant role in the process of making PU dispersions than the mechanical agitation, and that phi has a weak effect on the mean drop sizes. The results further suggest that mechanical agitation can be used to control the breadth of the distributions. |
| DOI : |
10.1007/s11998-004-0034-y |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0034-y.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3863 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 4 (10/2004) . - p. 329-335
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