[article]
| Titre : |
Process model for latex film formation : Optical clarity fronts |
| Type de document : |
texte imprimé |
| Auteurs : |
Alexander F. Routh, Auteur ; William B. Russel, Auteur ; Jiansheng Tang, Auteur ; Mohamed S. El-Aasser, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 41-48 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Formation de film
Modèles mathématiques
Revêtements en phase aqueuse -- Séchage:Peinture en phase aqueuse -- Séchage
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
We examined the drying behavior of latex both theoretically and experimentally. The theory extends a model for horizontal drying fronts in films with nondeformable particles to incorporate particle deformation by a capillary deformation mechanism. The pressure in the fluid, causing particle compaction, arises from flow through the packed bed to ensure evaporation from all wet areas of the film. We predicted the position of a front of volume fraction unity passing across a semi-infinite film as it dries. Experimentally, the position of the transition from a cloudy film to optical clarity was tracked visually in films comprised of either single component soft latex particles, 20[degrees]C above the glass transition, or a blend containing 35% non-deformable hard latex particles. For an initial volume fraction of 0.33, we found excellent agreement between theory and experiment. For an initial volume fraction of 0.05, the agreement is less, although still qualitative. The limitations of the model with respect to t he knowledge of physical parameters and initial conditions are discussed. One major implication of the model is that deformation of soft latex particles displaces large amounts of water and, consequently, slozvs progression of the drying front. Harder particles and shallow initial film profiles produce more pronounced drying fronts. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5728 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 916 (05/2001) . - p. 41-48
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Process model for latex film formation in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 916 (05/2001)
