Revealing nanoscale chemical heterogeneity at the surface of water-based coatings prepared from urethane–acrylic hybrids by photo-induced force microscopy / Qi Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1553-1558 Titre : Revealing nanoscale chemical heterogeneity at the surface of water-based coatings prepared from urethane–acrylic hybrids by photo-induced force microscopy Type de document : texte imprimé Auteurs : Qi Chen, Auteur ; Saskia van der Slot, Auteur ; Sven Kreisig, Auteur ; Mingwen Tian, Auteur ; Ron Peters, Auteur ; Joachim Loos, Auteur Année de publication : 2019 Article en page(s) : p. 1553-1558 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère uréthane acrylique Microscopie Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The surface chemical composition of water-based coatings prepared from urethane–acrylic hybrids or blends is investigated using infrared photo-induced force microscopy. By monitoring the interaction between the optically driven molecular dipole and its mirror image in a metal-coated tip, detailed information of the chemical composition at the coating surface down to 20 nm local resolution in all three dimensions is obtained. The film matrix of the coatings is determined to be the polyurethane while the polyacrylate particles are dispersed in the film. Phase separation of the two materials is found to be at a much smaller length scale in hybrid coatings compared to that in blends. This is because the acrylic monomers are introduced during the dispersion of the polyurethane in the synthesis of the hybrid particles, in contrast to the simple mixing of the two polymer particles in the case of the blends. Photo-induced force microscopy proved to be a powerful tool in the identification and visualization of different chemical species of coating surfaces at the nanoscale. DOI : 10.1007/s11998-019-00208-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00208-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33259 [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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