Accueil
Résultat de la recherche
4 résultat(s) recherche sur le tag 'associatif'
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
Associative polymer/latex dispersion phase diagrams. II : HASE thickeners / Edward Kostansek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
[article]
Titre : Associative polymer/latex dispersion phase diagrams. II : HASE thickeners Type de document : texte imprimé Auteurs : Edward Kostansek, Auteur Année de publication : 2005 Article en page(s) : p. 417-422 Note générale : Bibliogr. Langues : Américain (ame) Tags : Stabilité colloïdale Polymère associatif Propriété thermodynamique Etude expérimentale Peinture Application Effet concentration Dispersion Groupe hydrophobe latéral Méthacrylate de méthyle copolymère aqueuse Acrylate butyle Epaississant Polyélectrolyte d'éthyle Méthacrylique acide Dimension particule Matériau revêtement Floculation Agent surface Diagramme phase Latex Index. décimale : 667.9 Revêtements et enduits Résumé : The colloidal interactions ofHASE associative polymers and latexes in the presence of surfactant are complicated and subject to a number of variables. Both bridging and depletion flocculation can occur, in addition to good particle dispersion. Dispersion phase diagrams have been developed to help visualize these interactions. The various dispersion states can have a significant effect on coating formulations and film properties. Examples of dispersion phase diagrams are presented for a model HASE anionic associative thickener and various model latexes in the presence of sodium dodecylsulfate and nonionic surfactants. The major variables affecting dispersion behavior are associative polymer concentration, latex particle size, latex surface hydrophobicity, electrolyte concentration, and surfactant concentration. The dispersion phase behavior of the HASE systems is compared to that of HEUR thickened systems reported previously. A significant difference is that much less bridging flocculation is observed in the HASE systems. In addition, nonionic surfactants induced depletion flocculation in the HASE systems but not in the HEUR systems. DOI : 10.1007/BF02733884 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733884.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3836
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 417-422[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible Tailoring HASE rheology through polymer design : Effects of hydrophobe size, acid content, and molecular weight / Wenjun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
[article]
Titre : Tailoring HASE rheology through polymer design : Effects of hydrophobe size, acid content, and molecular weight Type de document : texte imprimé Auteurs : Wenjun Wu, Auteur ; Greg D. Shay, Auteur Année de publication : 2005 Article en page(s) : p. 423-433 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polymère associatif Viscosité cisaillement nul Matériau revêtement Modélisation Propriété rhéologique Etude expérimentale Dispersion aqueuse Peinture Application Solution Relation masse moléculaire propriété Ecoulement cisaillé Modèle composition Latex Epaississant Polyélectrolyte Terpolymère Groupe hydrophobe latéral Méthacrylique acide copolymère Acrylate d'éthyle Index. décimale : 667.9 Revêtements et enduits Résumé : Hydrophobically modified alkali-soluble emulsion (HASE) polymers are an important class of rheology modifiers for waterborne coatings applications. They are typically prepared as terpolymers by emulsion polymerization of ethyl acrylate (EA), methacrylic acid (MAA), and an associative macromonomer. The viscosity development and shear responses of HASE solutions depend on a number of factors. This article presents rheological data reflecting the impacts of three key variables: hydrophobe size, acid content, and molecular weight, on model HASE thickening and rheological performance. The relative contributions of hydrophobic association, chain expansion, and polymer chain length are discussed. In steady shear flow, all thickener solutions approached some constant low-shear viscosity at small deformation rates. At the same molar composition, larger hydrophobe size resulted in higher viscosity development and greater shear thinning behavior. The amount of acid monomer in HASE polymers can influence the balance between hydrophobic attraction and electrostatic repulsion forces. It was found that a minimum of 15 wt% MAA was required to effect dissolution and thickening of the model HASE polymers. Increasing the MAA level yielded higher zero-shear viscosity and storage modulus G' with maximal values being obtained at 40% MAA. The molecular weight of the model thickeners was controlled by the amount of chain transfer agent (CTA) added during polymerization. When the CTA level was below 0.1 wt% based on total monomers, the polymer solutions displayed shear-thinning behavior. A small increase in CTA concentration beyond 0.1% resulted in a dramatic change to Newtonian flow, and the solution viscosity was nearly two orders of magnitude lower. The model thickeners were also tested in a vinyl acrylic architectural paint formulation. The effects of each individual factor on paint thickener efficiency, high-shear, and low-shear properties are discussed and compared with solution rheology for predictive relationships. DOI : 10.1007/BF02733885 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733885.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3837
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 423-433[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible Using dispersion/flocculation phase diagrams to visualize interactions of associative polymers, latexes, and surfactants / Edward Kostansek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 940 (05/2003)
[article]
Titre : Using dispersion/flocculation phase diagrams to visualize interactions of associative polymers, latexes, and surfactants Type de document : texte imprimé Auteurs : Edward Kostansek, Auteur Année de publication : 2003 Article en page(s) : p. 27-34 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polymère associatif Interaction intermoléculaire Dispersion Floculation Formulation Agent surface anionique Epaississant Adjuvant Latex Electrolyte polymère Diagramme phase Peinture Mécanisme réaction Index. décimale : 667.9 Revêtements et enduits Résumé : The colloidal interactions of associative polymers and latexes in the presence of surfactant is complex. This is because, in addition to good particle dispersion, both bridging and depletion flocculation can occur. Therefore, we have developed phase diagrams to help visualize these interactions. The various phases have a significant effect on coatings and applications properties. Examples of phase diagrams are presented for a model HEUR nonionic associative polymer and latexes in the presence of sodium dodecylsulfate. The major variables affecting phase behavior were found to be associative polymer concentration, latex particle size, latex surface hydrophobicity, and electrolyte, cosolvent, and surfactant concentrations. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5584
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 940 (05/2003) . - p. 27-34[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 000565 - Périodique Bibliothèque principale Documentaires Disponible Waterborne latex coatings of color : I. Component influences on viscosity decreases / David M. Mahli in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)
[article]
Titre : Waterborne latex coatings of color : I. Component influences on viscosity decreases Type de document : texte imprimé Auteurs : David M. Mahli, Auteur ; J. Edward Glass, Auteur ; Jon M. Wegner, Auteur Année de publication : 2005 Article en page(s) : p. 627-634 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polymère associatif Propriété rhéologique Ether cyclique polymère Etude expérimentale Maléique acide copolymère Ethylène oxyde Oligomère téléchélique Colorant Noir carbone Viscosité cisaillement Relation formulation propriété Agent surface Epaississant Matériau revêtement Peinture eau Index. décimale : 667.9 Revêtements et enduits Résumé : For almost two decades, it has been known that the addition of colorants to a waterborne latex coating thickened with an associative thickener will result in a viscosity loss. The influence of surfactants on viscosity variations in waterborne latex coatings, as discussed in our most recent fCT COATINGSTECH article, is the source of the viscosity decreases. To evaluate this problem, aqueous solutions containing large quantities of five different surfactants, and the smallest particle size of the colorants, carbon black (CB), were prepared. Large quantities of surfactant were used to allow for adsorption on, and stabilization of, CB. When traditional associative polymers (HMHEC, HASE, and a telechelic HEUR) were used to thicken carbon black dispersions, viscosity decreases were not observed, for most of the surfactant is adsorbed on the CB's surface. There is enough surfactant, however, to promote viscosity decreases in comb-HEUR thickened CB dispersions. Moving beyond the colorant dispersions, the CB, yellow, or red colorants were then added to a commercial latex paint that contains many surfactants, glycol ether, and coalescing aids, and significant viscosity decreases were observed. The decreases were very dramatic as the colorant concentration was increased to obtain deeper color tones, due to the additional excess surfactant added to the coating. Reduction in total surfactant levels in the colorant was an obvious solution, but this led to rub-up incompatibility. The conflict between viscosity retention and rub-up incompatibility was resolved when the surfactant concentration was reduced by adding to the colorant formulation compositionally different hydrophobically-modified poly(oxyethylenes) and hydrophobe-modified maleic acid co-oligomers. DOI : 10.1007/BF02774592 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774592.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3788
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 627-634[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 003121 - Périodique Bibliothèque principale Documentaires Disponible