Unifying model for associative thickener influences on waterborne coatings : II. Competitive adsorption of nonionic surfactants and HEUR thickeners on titanium dioxide pretreated with inorganic stabilizers and organic oligomeric dispersants / Ming-Ren Tarng in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 935 (12/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 935 (12/2002) . - p. 45-51 Titre : Unifying model for associative thickener influences on waterborne coatings : II. Competitive adsorption of nonionic surfactants and HEUR thickeners on titanium dioxide pretreated with inorganic stabilizers and organic oligomeric dispersants Type de document : texte imprimé Auteurs : Ming-Ren Tarng, Auteur ; John G. Dickinson, Auteur ; J. Edward Glass, Auteur ; Mao Chen, Auteur Année de publication : 2002 Article en page(s) : p. 45-51 Note générale : Bibliogr. Langues : Américain (ame) Tags : Chromatographie  gel  Spectrométrie  UV  Etude  expérimentale  Dispersant  Traitement  surface  Titane  Oxyde  Agent  non  ionique  Adsorption  Pigment  minéral  Interaction  Uréthane  Epaississant  Adjuvant  Peinture  eau  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Size exclusion chromatography in tandem with UV absorbance of the surfactant is used to separate and quantify the amount of nonionic surfactant and model hydrophobically modified ethoxylated urethane (HEUR) thickeners adsorbed on different organic oligomeric polyacid, metal oxide-treated TiO2 surfaces. The isoelectric point imposed on TiO2 by the metal oxide surface treatment determines the amount of organic dispersant adsorbed. The size of the a-olefin on the maleic acid dispersant is also important in the adsorption of the dispersant. The size of the a-olefin on the organic acid dispersant, in turn, determines the amount of surfactant and HEUR thickener adsorbed. The surfactant, unlike the HEUR thickener, exhibits a dependence on the metal oxide treatment in neutral media, independent in several aspects of the amount of organic dispersant adsorbed. The adsorption dependence of HEUR thickeners and nonionic surfactant on the hydrophobe size of the HEUR is discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5614 [article]

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Unifying model for understanding HEUR associative thickener influences on waterborne coatings : I. HEUR interactions with a small particle latex / Mao Chen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 867 (04/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 867 (04/1997) . - p. 73-80 Titre : Unifying model for understanding HEUR associative thickener influences on waterborne coatings : I. HEUR interactions with a small particle latex Type de document : texte imprimé Auteurs : Mao Chen, Auteur ; Wyllie H. Wetzel, Auteur ; Zeying Ma, Auteur ; J. Edward Glass, Auteur ; Robert J. Buchacek, Auteur ; John G. Dickinson, Auteur Année de publication : 1997 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Epaississants Hydrophobie Polyéther uréthane Revêtements -- Additifs:Peinture -- Additifs Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : The structural features of associative thickeners influence their viscosifying properties in neat and surfactant containing aqueous solutions and in architectural coating formulations. Our understanding of the phenomena based on model associative thickener of the Hydrophobically modified Ethoxylate URethane (HEUR) type are presented. These studies provide general concepts in aqueous solutions, but they do not provide a quantitative model for understanding the influence of associative thickeners in coating formulations. To provide a more quantitative description, the interactions of associative thickeners with the film forming latex are considered in this study. This requires a knowledge of the free surfactant concentration in the formulation that depends on the residual amount present in the latex and the amounts added with the pigment grind, colorant, etc. The competitive interaction of the surfactants and associative thickener types for the surface of both disperse phases is a key variable. These interactions with the latex will be discussed in this article in an effort to define an encompassing model for understanding how HEUR associative thickeners influence waterborne coatings. Note de contenu : - Adsorption on small particles latexes - Rheology of thickened dispersions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18232 [article]

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