Characterization and rheological investigation of polymer microgels used in automotive coatings / Lori J. Boggs in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 855 (04/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 855 (04/1996) . - p. 63-73 Titre : Characterization and rheological investigation of polymer microgels used in automotive coatings Type de document : texte imprimé Auteurs : Lori J. Boggs, Auteur ; M. Rivers, Auteur ; S. G. Bike, Auteur Année de publication : 1996 Article en page(s) : p. 63-73 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Caractérisation Colloides Haut extrait sec Polymères Revêtements -- Additifs Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The mechanism by which polymer microgels impart shear-thinning behavior and a yield stress to the Newtonian, low molecular weight resin of high-solids solvent-borne automotive coatings is not well understood. Toward identifying this mechanism, we measured the viscosity of several microgel dispersions as a function of particle volume fraction as well as the size and polydispersity of the particles. Variations in the relative softness of the particles, due to differences in the steric layer thickness or crosslink density of the particles, gave rise to differences in the viscometry behavior. When dispersed in acrylic polymer solutions, the microgels induced a yield stress that displayed a power-law dependence on particle concentration. Dynamic oscillatory measurements were used to investigate the nature of the structure formed by the microgels. The mechanim of structure formation can be attributed to depletion flocculation when the polymer does not absorb to the microgels and to bridging flocculation when the polymer does absorb. Note de contenu : - EXPERIMENTAL : Materials - Scanning electron microscopy - viscometry - RESULTS AND DISCUSSION : Microgels - Yiel value measurements - Structure formation measurements - Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18324 [article]

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Rheological parameters of waterborne coatings / Lori J. Boggs in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/98 (05/1998)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 5/98 (05/1998) . - p. 350-353 Titre : Rheological parameters of waterborne coatings Type de document : texte imprimé Auteurs : Lori J. Boggs, Auteur ; David Law, Auteur ; Hitoshi Taniguchi, Auteur Année de publication : 1998 Article en page(s) : p. 350-353 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The authors have studied the rheological parameters of several waterborne coating systems to determine if there are particular material characteristics common to coatings with good flake orientation. They also evaluated the effect of varying the type and level of different types of rheology control agents within one waterborne basecoat system to determine the effect on rheological properties as well as on the flake orientation of the final film. This work shows that no single rheological parameter will correlate with good flake orientation in all systems, and surprisingly, lower solids systems do not necessarily result in coatings with better flake orientation. Note de contenu : EXPERIMENTAL : Materials - Rheological characterization - Spray application - Flake orientation RESULTS AND DISCUSSION : Rheology control agenrs (RCAs) - The effect of RCA type and level on MF index En ligne : https://drive.google.com/file/d/1JlaGTmtG1J3k4sNVgQFnEXEKaVlgWeUz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11097 [article]

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