Chemical depth profiling of automotive coating systems using slab microtome sectioning with IR/UV-VIS spectroscopy and optical microscopy / Karlis Adamsons in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 924 (01/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 924 (01/2002) . - p. 47-54 Titre : Chemical depth profiling of automotive coating systems using slab microtome sectioning with IR/UV-VIS spectroscopy and optical microscopy Type de document : texte imprimé Auteurs : Karlis Adamsons, Auteur Année de publication : 2002 Article en page(s) : p. 47-54 Note générale : Bibliogr. Langues : Américain (ame) Tags : Essai  vieillissement  Dégradation  photochimique  Revêtement  multicouche  Etude  expérimentale  Microscopie  optique  Spectrométrie  UV  visible  IR  Microtomie  Profil  profondeur  Feuil  Analyse  chimique  Vernis  Peinture  Matériau  revêtement  Industrie  automobile Index. décimale : 667.9 Revêtements et enduits Résumé : Chemical surface/near-surface analysis and depth profiling of high performance automotive coating systems can be done efficiently by commonly available infrared (IR), ultraviolet-visible (UV-VIS) and optical microscopy (OM) measurement technologies. The different stages of mass loss for acrylic/melamine-crosslinked clearcoats modeled after those used in high performance automotive coating systems were explored as a function of exposure time/conditions. Two approaches were used. Transmission mode IR experiments were conducted to monitor mass loss in isolated clearcoats. OM was used to monitor mass loss in clearcoats that are part of actual multilayered coating systems. UV-screener (UVA) permanence and interphase mixing (i.e., between clearcoat and basecoat layers) as well as general chemistry depth profiling studies of model acrylic/melamine-crosslinked and acrylic/melamine+silane-crosslinked clearcoats were done as a function of system preparation and exposure time/conditions. UVA depth profiles were obtained using slab microtomy sectioning co-planar to the surface, followed by solvent extraction and UV-VIS solution analysis to monitor UVA content as a function of section mass and thickness. General chemistry depth profiles were obtained using slab microtomy sectioning (as mentioned previously), followed by ATR (IR) analysis to monitor changes in the photooxidation index balues and the spectral envelop in the 2600-3800 cm-1 range. The approaches described herein de not require expertise/equipment that is available to only a few, thus increasing the potential utility of such tools. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5680 [article]

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Migration of reactable UVAs and HALS in automotive plastic coatings / Philip V. Yannef in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 3 (07/2004)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 3 (07/2004) . - p. 201-212 Titre : Migration of reactable UVAs and HALS in automotive plastic coatings Type de document : texte imprimé Auteurs : Philip V. Yannef, Auteur ; Mouhcine Kanouni, Auteur ; Nancy Cliff, Auteur ; Karlis Adamsons, Auteur Année de publication : 2004 Article en page(s) : p. 201-212 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère mélamine-formaldéhyde Durée de vie (Ingénierie) Essais accélérés (technologie) Haut extrait sec Organosilanes Prévision, Théorie de la Revêtement en plastique Silanes Stabilisant à la lumière de type amine encombrée Stabilisants à la lumière Surfaces -- Analyse Tags : Stabilisants  à  la  lumièreanalyse  de  surfacerésines  mélamine-formaldéhydeorganosilaneessais  accélérésprévision  durée  vieplumeautomobile  -  OEMmélamine  haute  teneur  en  solidessilaneles  plastiques Index. décimale : 667.9 Revêtements et enduits Résumé : Loss of light stabilizers from automotive finishes can significantly reduce the durability of coatings on plastic substrates. Minimizing movement by retaining the stabilizers in the targeted layer can greatly improve coating longevity. This article examines the migratory patterns of a series of traditional UVA and HALS additives in fully formulated 1K silane crosslinked coatings applied over both plastic and steel substrates, comparing their migratory patterns to that of reactable light stabilizers containing hydroxyl functionality. Analysis of the coating layers with the various UVAs and HALS revealed that functionalization of the light stabilizer with reactable hydroxy groups can prevent migration into the plastic; whereas nonreactable light stabilizers migrate into lower coating system layers and even into the plastic substrate. The greatest extent of migration does not occur during initial cure of the wet coating, but during exposure. Significant depletion of the nonreactable light stabilizers from the topcoat occurs as early as 1500 hours of Xenon boro/boro exposure. DOI : 10.1007/s11998-004-0013-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0013-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3900 [article]

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A modern analytical toolbox : defect (W&D) studies of automotive coating systems, including depth profiling studies / Karlis Adamsons in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 6 (11/2012) . - p. 745-756 Titre : A modern analytical toolbox : defect (W&D) studies of automotive coating systems, including depth profiling studies Type de document : texte imprimé Auteurs : Karlis Adamsons, Auteur Année de publication : 2012 Article en page(s) : p. 745-756 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automotile -- Peinture -- Détérioration Durée de vie (Ingénierie) Revêtements -- Analyse Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : Chemical and microscopy measurement technologies have proven to be very powerful in our failure analysis efforts to detail composition and morphology changes of multilayered automotive coating systems obtained from the field. Weathering and durability (W&D) analyses used include those following chemical composition and property changes, at surface/near-surface and interface/interphase loci, as well as depth profiling through one or more system layers. Microscopy tools include a variety of techniques to study surfaces and normal cross sections. Both macro- and micro-morphology details can be effectively imaged to help investigators correlate coating system appearance changes with the mechanisms, and associated kinetics, of degradation. This article will offer an overview of commonly used analyses for developing new coating systems and for tracking appearance, chemical, physical, and mechanical changes due to common mechanisms causing coating systems to fail during service in the field. Note de contenu : - EXPERIMENTAL : Monitoring chemical composition - Imaging loci of interest - Coating system and component samples - RESULTS AND DISCUSSION : Monitoring chemical composition - Imaging loci of interest - Color changes - The analytical toolbox DOI : 10.1007/s11998-012-9412-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9412-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16660 [article]

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Structure/property relationships in flexible alkoxysilane automotive coatings / Phillip V. Yaneff in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 933 (10/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 933 (10/2002) . - p. 135-141 Titre : Structure/property relationships in flexible alkoxysilane automotive coatings Type de document : texte imprimé Auteurs : Phillip V. Yaneff, Auteur ; Karlis Adamsons, Auteur ; Rose Ann Ryntz, Auteur ; Dottie Britz, Auteur Année de publication : 2002 Article en page(s) : p. 135-141 Note générale : Bibliogr. Langues : Américain (ame) Tags : Silane(alcoxy)  polymère  Vieillissement  Dégradation  Essai  mécanique  Vernis  Résistance  intempérie  Contrainte  compression  Cisaillement  Indentation  rayure  Flexibilité  Feuil  Propriété  Liant  Formulation  Relation  structure  propriété  Industrie  automobile  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Flexible automotive coatings are susceptible to scratch and mar damage, especially during finishing and assembly operations. One-component (1K) flexible clearcoats exhibit very good scratch and mar resistance, but unfortunately suffer from poor durability and environmental etch resistance. Two-component clearcoats offer improvements in both etch and durability, but at the expense of scratch and mar. In this paper, the concept and properties of 1K flexibilized silane clearcoats for use on automotive plastics will be introduced and their structure/ property relationships examined as they apply to scratch and mar. The role of coating crosslink density, toughness, glass transition temperature (Tg), and surface profile on the scratch damage of coated plastic substrates will be described. In addition, a new scratch methodology, termed Scratcho, is utilized to determine relative scratch performance and is compared to conventional scratch resistance testing. Results to date indicate that hardness, as affected by the glass transition temperature, and crosslink density, as it contributes to higher essential work values, both affect resultant scratch propensityofthe flexible coatings. The relative ranking of different-coating systems employing alternate crosslinkers (e.g., isocyanate and melamine) is also presented and compared to the newly developed silane crosslinked coatings. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5620 [article]

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Use of reactable light stabilizers to prevent migration and to improve durability of coatings On plastic substrates / Nancy Cliff 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. 371-387 Titre : Use of reactable light stabilizers to prevent migration and to improve durability of coatings On plastic substrates Type de document : texte imprimé Auteurs : Nancy Cliff, Auteur ; Karlis Adamsons, Auteur ; Phillip V. Yaneff, Auteur ; Cindy Peters, Auteur ; Mouhcine Kanouni, Auteur Année de publication : 2005 Article en page(s) : p. 371-387 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Durabilité  Dégradation  photochimique  Vieillissement  accéléré  Pipéridine  dérivé  Triazine  Absorbant  UV  Stabilisant  Additif  Relation  formulation  propriété  Peinturage  Procédé  revêtement  Matériau  revêtu  Elastomère  Mélange  polymère  Oléfine  Caoutchouc  thermoplastique Index. décimale : 667.9 Revêtements et enduits Résumé : One of the challenges of coating plastic substrates for exterior automotive applications involves the tendency for light stabilizers, which inhibit UV degradation of the coating, to migrate out of the topcoat and into the underlying plastic substrate. The consequent depletion of the stabilizer from the topcoat could account for significantly poorer durability for coatings applied on plastic than on a nonpermeable substrate such as steel. These studies investigate the migration of both nonreactable and reactable UV absorbers (UVAs) and hindered amine light stabilizers (HALS) in fully formulated 2K urethane coatings applied on thermoplastic olefin (TPO) and steel substrates. Extensive migration of the nonreactable stabilizers occurs during accelerated exposure of the cured coating, and this migration correlates with poorer performance on TPO. Functionalization of the stabilizer with a group which covalently reacts into the coating will prevent much of this migration, and the improved degree of retention of the reactable light stabilizers in the topcoat correlates with improved performance on TPO substrates. In addition, stabilizer variables, such as the type and extent of functionalization as well as their chemical structure, have an effect on both the migration and performance of the stabilizers. DOI : 10.1007/s11998-005-0005-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0005-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3727 [article]

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