Rheological changes during the drying of a waterborne latex coating / Frank Loffläth 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. 55-66 Titre : Rheological changes during the drying of a waterborne latex coating Type de document : texte imprimé Auteurs : Frank Loffläth, Auteur ; Matthew Gebhard, Auteur Année de publication : 1997 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Evaporation Latex Revêtement -- Séchage:Peinture -- Séchage Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Increases in the low shear viscosity occurring during drying of a water-based latex film were examined as a function of pH, cosolvents, and base. The water and cosolvent evaporation rates were determined as a function of temperature and humidity. Water was found to evaporate with an activity coefficient of 1 and a ΔHv equivalent to pure water. The viscosity changes were determined from a creep measurement. The data is explained by the volume packing model of De Kruif. For several of the films, the ratio between volume and weight fraction was not a static parameter, and an abnormally large drop in the effective volume and weight fraction was observed. This was exaggerated for the samples with ethylene glycol monobutyl ether (EB) or NH4OH. The high volatility of EB explains the former, while the latter result indicates that NH4OH suppresses viscosity during drying. Note de contenu : - THEORETICAL BACKGROUND : Evaporation process - Viscosity and volume fraction - Combination of evaporation and volume-fraction/ viscosity equations - EXPERIMENTAL DATA : Raw material and sample preparation - Evaporation measurements - Viscosity increase during evaporation - Intrinsic viscosity - Determination of open time - RESULT AND ANALYSIS : Evaporation rates - Intrinsic viscosity - Viscosity increase during drying - Physical changes in the sample upon drying - Correlation between drying curve data and open time Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18111 [article]

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Surface topography and tribological properties of coatings prepared from microparticle size polyurethane dispersions studied by atomic force microscopy / Qi Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 713-719 Titre : Surface topography and tribological properties of coatings prepared from microparticle size polyurethane dispersions studied by atomic force microscopy Type de document : texte imprimé Auteurs : Qi Chen, Auteur ; Roel Swaans, Auteur ; Paul de kok, Auteur ; Michael Villet, Auteur ; Yansen Lauw, Auteur ; Matthew Gebhard, Auteur Année de publication : 2018 Article en page(s) : p. 713-719 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions Microscopie à force atomique Milieux dispersés Polymères en émulsion Polyuréthanes Revêtements Topographie Tribologie (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The surface topography and mechanical properties of coatings prepared using large particle size polyurethane dispersions (PUD) are investigated using atomic force microscopy (AFM) imaging, AFM-based force measurements, and friction force microscopy. PUD coatings, which are prepared from dispersions containing particles of micron size, have surface roughness of 250–300 nm and waviness of 2.5–3 μm resulting from the particle size. The surface moduli of the PUD coatings are varied by tuning the ratio of hard-to-soft segmentation in the polyurethanes and are found to be between 40 and 100 MPa. The friction coefficient obtained in the study is found to be correlated with both the surface modulus of the coatings and the adhesion between the probe and the samples and is well in line with the perceived feel of an experienced human panel. The data are very well behaved and clearly show the utility of this technique in characterizing these types of surfaces. Note de contenu : - PUD coatings - AFM imaging and force measurements - Friction force microscopy DOI : 10.1007/s11998-018-0067-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0067-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30849 [article]

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