| Titre : |
Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures |
| Type de document : |
texte imprimé |
| Auteurs : |
Travis B. Smith, Auteur ; David Chisholm, Auteur ; Abby Cheng, Auteur ; Juan Ortiz Salazar, Auteur ; Lia Roccucci, Auteur ; Bailey Morales, Auteur ; Gary Dombrowski, Auteur ; John J. Rabasco, Auteur ; Patrick Hartnett, Auteur ; Ray Fernando, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 1311-1324 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cisaillement (mécanique)
Epaississants
Epaississement
Floculation
Latex
Polyuréthane éthoxylé modifié de façon hydrophobe
Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
SynérèseEn chimie, la synérèse définit la séparation d'un liquide de son gel.
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In this study, hydrophobically modified, ethoxylate urethanes (HEURs) and latexes of well-defined structure and composition were used to examine the rheology and phase behavior of HEUR–latex mixtures. The mixtures comprised one of four HEURs that were synthesized with varying molecular weight polyethylene glycols (PEG 35 K, 20 K, 12 K, and 8 K) and end-capped with octadecyl hydrophobes, as well as one of two latexes (butyl acrylate/styrene [BA-Sty] and butyl acrylate/methyl methacrylate [BA-MMA]) that each contained a small amount of methacrylic acid. The two experimental latexes represent compositions commonly used in commercial paint formulations. The polarity of the HEURs decreases as the PEG molecular weight decreases and the surface of the styrene containing latex is less polar than that containing methyl methacrylate. In all HEUR–latex mixtures, the latex polymer volume fraction was maintained constant at 0.25 which provides a dispersed component spatial crowdedness that represents a fully formulated paint. All latex–HEUR mixtures were stable at very low (i.e., below 0.10% by weight) HEUR levels. At critical concentrations dependent on the polarity of thickener and latex, flocculation was accompanied by syneresis for latex-thickener mixtures prepared with all HEURs except the one with the longest PEG spacer. Further increase of HEUR levels revealed another critical concentration above which the mixtures were stable. Effects of the latex polarity diminished for the mixtures prepared with more hydrophobic HEURs. |
| Note de contenu : |
- HEUR C18-EO795 and latex mixtures
- HEUR C18-EO455 and latex mixtures
- Table 1 : Compositions and molecular weights (determined by GPC) of model HEURs
- Table 2 : Properties of model latexes
- Table 3 : Compositions of representative latex–HEUR mixtures
- Table 4 : Visual assessment of stability of latex–HEUR samples after 6–8 days of equilibration
- Table 5 : Number of HEUR molecules available per BA-Sty latex particle
- Table 6 : Latex surface area (nm2) claimed by a HEUR hydrophobe, assuming one of the hydrophobes from every HEUR molecule is adsorbe |
| DOI : |
https://doi.org/10.1007/s11998-022-00746-3 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-022-00746-3.pdf?pdf=button% [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39718 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1311-1324
Aller sur edunet
Accueil
Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
