Characterization of adhesion performance of topcoats and adhesion promoters on TPO substrates / Jonathan E. Lawniczak in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 5 (01/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 5 (01/2005) . - p. 399-405 Titre : Characterization of adhesion performance of topcoats and adhesion promoters on TPO substrates Type de document : texte imprimé Auteurs : Jonathan E. Lawniczak, Auteur ; Kevin A. Williams, Auteur ; Louis T. Germinario, Auteur Année de publication : 2005 Article en page(s) : p. 399-405 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Propriété  interface'  'Promoteur  adhérence'  'Etude  expérimentale'  Automobile  Application  'Essai  pelage'  'Méthode  mesure'  Adhésivité  'Relation  mise  en  oeuvre  propriété'  'Polymère  chloré'  'Oléfine  dérivé  halogéné  polymère'  'Couche  primaire'  'Traitement  surface'  Prétraitement  Peinturage  Caractérisation  'Procédé  revêtement'  'Matériau  revêtu'  Elastomère  'Mélange  polypropène  'Caoutchouc  thermoplastique' Index. décimale : 667.9 Revêtements et enduits Résumé : Adhesion of organic coatings to thermoplastic olefin (TPO) substrates in automotive applications has been an issue for makers of automotive parts since TPO was first used in exterior applications, primarily fascia. A widely used technique for assuring paint adhesion to TPO is the use of adhesion promoter primers based on chlorinated polypropylenes (CPO). Much research has been focused on understanding the forces involved at the interfaces of substrate, adhesion promoter, and topcoats resulting in the adhesion or the loss of adhesion in various environmental conditions. This study correlates the adhesion performance of CPO and nonchlorinated adhesion promoters (NCPO) as measured by peel strength with properties observed through microscopy techniques. Adhesion performance of CPOs, NCPOs, and blends are quantified through the use of 90° and 180° peel strength studies. Surface characteristics of adhesion promoters applied over a TPO substrate and cured at various temperatures are examined through the use of atomic force microscopy (AFM). DOI : 10.1007/s11998-005-0007-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0007-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3729 [article]

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A closer look at low gloss powder coatings / Louis T. Germinario in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/03 (10/2003)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10/03 (10/2003) . - p. 25-31 Titre : A closer look at low gloss powder coatings : AFM measurements clarify the modification effect of incompatible polyester-b-hydroxyalkylamide resin blends Type de document : texte imprimé Auteurs : Louis T. Germinario, Auteur ; Damiano Beccaria, Auteur ; Andrea Capra, Auteur ; Imir Bejko, Auteur Année de publication : 2003 Article en page(s) : p. 25-31 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : For the defined matting of TGIC-free polyester beta-hydroxyalkylamide powder coatings, dry blends of formulations based on resins that are incompatible due to their different reactivity have been shown to have a high potential. To clarify the effects that govern the gloss reduction, the correlation of coatings performace dat with Atomic Force Microscopy results can be extremely helpful. Note de contenu : Experimental details / measuring surface stiffness via afm / Beta-HAA content affects the roughness / Roughness is th cause for gloss reduction / Higher functionality - lower gloss - higher siffness En ligne : https://drive.google.com/file/d/1dxe3sRgUwROXLHNSOMPOEPmq3jUFHL4f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9492 [article]

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Keep on eye on the acid value / Damiano Beccaria in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/03 (07-08/2003)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/03 (07-08/2003) . - p. 21-25 Titre : Keep on eye on the acid value : Structure-property relations of incompatible resin blends for effective gloss control of polyester-b-hydroxyalkylamide powder coatings Type de document : texte imprimé Auteurs : Damiano Beccaria, Auteur ; Andrea Capra, Auteur ; Imir Bejko, Auteur ; Louis T. Germinario, Auteur Année de publication : 2003 Article en page(s) : p. 21-25 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Precise gloss control of powder coatings is a major issue, especially since TGIC-free formulations have mad this task more difficult. However, detailed structure-property analyses of blends of polyester-β-hydroxyalkylamide systems based on different, incompatible resins reveal, that the difference in acid value between the two resins in the blends can serve as a very reliable gloss determinating property. Note de contenu : Gloss modification mechanisms Experimental details Looking at the differences in resin properties Temperature effect in gloss reduction Gel time and acid value differences are independent Acid values can control gloss. En ligne : https://drive.google.com/file/d/1vaPhO2yKBaHCMynJ0VFCuIkfybrguMC8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9449 [article]

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Novel techniques to investigate the impact of cellulose esters on the rheological properties and appearance in automotive basecoat systems / Deepanjan Bhattacharya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 2 (06/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 2 (06/2007) . - p. 139-150 Titre : Novel techniques to investigate the impact of cellulose esters on the rheological properties and appearance in automotive basecoat systems Type de document : texte imprimé Auteurs : Deepanjan Bhattacharya, Auteur ; Kab Seo, Auteur ; Louis T. Germinario, Auteur ; Mark D. Clark, Auteur ; Kevin W. McCreight, Auteur ; Chip Williams, Auteur Année de publication : 2007 Article en page(s) : p. 139-150 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétobutyrate de cellulose Esters de cellulose Morphologie (matériaux) Revêtements -- Additifs:Peinture -- Additifs Rhéologie Viscoélasticité Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The viscous response of a coating formulation changes over several orders of magnitude after application onto a substrate. Furthermore, the performance and application attributes for a refinish basecoat formulation are slightly different from those of an OEM basecoat. The absence of a high temperature baking step during the refinish process necessitates that the paint exhibit very good antisag behavior as well as quick 'dry to touch' without compromising the flow and leveling properties of the coating as it dries. As most paint formulations are multicomponent in nature, it is always a challenge to precisely measure the impact of specific formulation components on the collective performance attributes of the applied coating. In this work, the focus has been to develop novel techniques that can be used to demonstrate a more quantitative measure of some of the performance attributes that rheological additives like cellulose esters can provide to automotive coatings. A series of pigmented basecoat formulations were prepared which contained cellulose acetate butyrates (CABs) of varying molecular weights at different levels based on the total solids of the coating formulation. The nonvolatile content of the formulations was also varied. The viscoelastic behavior of a typical automotive basecoat formulation during the drying process was then investigated using a novel rheological technique. Complex viscosity data (including storage and loss moduli as well as tan delta) were determined as a function of drying time and then compared to the macroscopic properties typically associated with a coating film as it dries. Thermogravimetric analysis (TGA) was also used to correlate the rheology of the metallic basecoat formulations with drying behavior of the coating. The final appearance of the coating was investigated by several microscopic techniques such as Laser Scanning Confocal Microscopy, Scanning Electron Microscopy, Atomic Force Microscopy, and Surface Profilometery, and attempts were made to correlate bulk measurements like 'flop index' with the microstructure of the coating. DOI : 10.1007/s11998-007-9014-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9014-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3655 [article]

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Transition temperature microscopy / Louis T. Germinario in COATINGS TECH, Vol. 7, N° 2 (02/2010)  

[article]  inCOATINGS TECH > Vol. 7, N° 2 (02/2010) . - p. 36-43 Titre : Transition temperature microscopy : probing thermal properties of coatings and multilayer films at the micro and nanoscale Type de document : texte imprimé Auteurs : Louis T. Germinario, Auteur ; Clifford K. Schoff, Auteur ; Kevin Kjoller, Auteur ; Craig Prater, Auteur ; Khoren Sahagian, Auteur Année de publication : 2010 Article en page(s) : p. 36-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Couches minces multicouches Microscopie Revêtements Revêtements -- Propriétés thermiques:Peinture -- Propriétés thermiques Revêtements multicouches Température de transition Index. décimale : 667.9 Revêtements et enduits Résumé : Transition temperature microscopy (TTM) is a novel local thermal analysis technique that maps spatial variations in thermal properties on length scales from millimeters to nanometers. Traditional bulk thermal analysis provides a sample averaged result and cannot generally supply sufficient information about complex structures or heterogeneities within films or coatings. There currently exists a nanoscale thermal analysis (nano-TA) technique in which a nanoscale thermal probe heats a localized region on the sample surface to measure its thermal properties, including thermal transition temperatures like crystalline melting points and glass transitions. TTM enables these nano-TA measurements to be carried out rapidly at a succession of points, thus creating automated high-resolution spatial maps of the thermal properties of a sample. In this article we also demonstrate how TTM can be used to characterize chemical and structural heterogeneities and thereby generate vital information in applications ranging from coating defects, to in-situ property measurement of individual layers in multilayered films, to the detection of gradients and interfaces. En ligne : https://drive.google.com/file/d/176lKkCgizq8JPiSxhlNm5AriY1h6BcDf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8593 [article]

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