Advanced techniques for nanocharacterization of polymeric coating surfaces / Xiaohong Gu 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. 191-200 Titre : Advanced techniques for nanocharacterization of polymeric coating surfaces Type de document : texte imprimé Auteurs : Xiaohong Gu, Auteur ; N.-K. Chang, Auteur ; Diep Nguyen, Auteur ; Y. C. Jean, Auteur ; Jonathan W. Martin, Auteur ; Tinh Nguyen, Auteur ; Li-Piin Sung, Auteur ; Mark R. VanLandingham, Auteur ; Michael J. Fasolka, Auteur ; T.-Y. Wu, Auteur Année de publication : 2004 Article en page(s) : p. 191-200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie des surfaces Durée de vie (Ingénierie) Epoxydes Fluoropolymères Microscopie à force atomique Morphologie (matériaux) Prévision, Théorie de la Résistance à l'abrasion Revêtements organiques Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : Surface properties of a polymeric coating system have a strong influence on its performance and service life. However, the surface of a polymer coating may have different chemical, physical, and mechanical properties from the bulk. In order to monitor the coating property changes with environmental exposures from the early stages of degradation, nondestructive techniques with the ability to characterize surface properties with micro- to nanoscale spatial resolution are required. In this article, atomic force microscopy has been applied to study surface microstructure and morphological changes during degradation in polymer coatings. Additionally, the use of AFM with a controlled tip-sample environment to study nanochemical heterogeneity and the application of nanoindentation to characterize mechanical properties of coatings surfaces are demonstrated. The results obtained from these nanometer characterization techniques will provide a better understanding of the degradation mechanisms and a fundamental basis for predicting the service life of polymer coatings. DOI : 10.1007/s11998-004-0012-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0012-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3899 [article]

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Effect of tio2 pigment type on the uv degradation of filled coatings / Deborah L. Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 19-33 Titre : Effect of tio2 pigment type on the uv degradation of filled coatings Type de document : texte imprimé Auteurs : Deborah L. Wang, Auteur ; Stephanie S. Watson, Auteur ; Li-Piin Sung, Auteur ; I-Hsiang Tseng, Auteur ; Craig J. Bouis, Auteur ; Raymond Fernando, Auteur Année de publication : 2011 Article en page(s) : p. 19-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Fourier, Spectroscopie infrarouge à transformée de Microscopie confocale à balayage laser Photodétérioration Pigments photoréactifs Polymères -- Effet du rayonnement ultraviolet Polymères -- Détérioration Revêtements -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this study was to investigate the effect of the photoreactivity of titanium dioxide (TiO2) pigments on the photodegradation of polymeric coatings used in exterior applications. Two polymer matrices, an amine-cured epoxy (EP) and an acrylic urethane (AU), containing three types of TiO2 pigments, classified by different levels of photoreactivity, were studied. Specimens were exposed on an ultraviolet (UV) weathering chamber, the Simulated Photodegradation by High Energy Radiant Exposure device at the National Institute of Standards and Technology. Two exposure conditions were used: ambient, dry condition [25°C and 0% relative humidity (RH)] and high temperature, wet condition (55°C and 75% RH), which is similar to more severe outdoor exposures. The physical and chemical degradations of the filled coatings were monitored at periodic intervals using a combination of laser scanning confocal microscopy (LSCM) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). Progression of degradation on the coating surfaces was characterized by LSCM in terms of changes in surface roughness and morphology, pigment agglomerate size, and the occurrence of pits or holes in the coatings. The observed physical changes were correlated to the chemical changes measured by ATR-FTIR as a function of UV exposure time. Both EP and AU systems showed less degradation in terms of surface roughness and morphological changes under the dry conditions compared to the wet exposure conditions. It was observed that both the pigment type (and hence photoreactivity) and particle dispersion strongly affected the degradation of both EP and AU systems. DOI : 10.1007/s11998-009-9216-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9216-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10919 [article]

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Measurement approaches to develop a fundamental understanding of scratch and mar resistance / Mark R. van Landingham in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 4 (10/2004)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 4 (10/2004) . - p. 257-266 Titre : Measurement approaches to develop a fundamental understanding of scratch and mar resistance Type de document : texte imprimé Auteurs : Mark R. van Landingham, Auteur ; Li-Piin Sung, Auteur ; Neng-Kai Chang, Auteur ; Tsun Yen Wu, Auteur ; Shuo-Hung Chang, Auteur ; Vincent Jardret, Auteur Année de publication : 2004 Article en page(s) : p. 257-266 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  mécanique  Etude  expérimentale  Viscoélasticité  Modélisation  comparative  Microscopie  confocale  Indentation  Méthode  mesure  Résistance  rayure  Dureté  Méthacrylate  de  méthyle  polymère  Epoxyde  résine Index. décimale : 667.9 Revêtements et enduits Résumé : Instrumented indentation and confocal microscopy were used to characterize the surface mechanical response of polymeric materials. Viscoelastic behavior was measured using instrumented indentation. A model based on the contact between a rigid probe and a viscoelastic material was used to calculate values for the creep compliance and stress relaxation modulus for two polymeric materials, epoxy and poly(methyl methacrylate) or PMMA. Scratch testing was performed on these materials with various probes under a variety of conditions, and confocal microscopy was used to characterize the resulting deformation. Relationships among viscoelastic behavior, scratch damage, and appearance are currently being explored using these methods along with finite element modeling. DOI : 10.1007/s11998-004-0028-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0028-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3857 [article]

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Metrology for characterizing scratch resistance of polymer coatings / Li-Piin Sung in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 583-589 Titre : Metrology for characterizing scratch resistance of polymer coatings Type de document : texte imprimé Auteurs : Li-Piin Sung, Auteur ; Shuo-Hung Chang, Auteur ; Tsun Yen Wu, Auteur ; Mark R. van Landingham, Auteur ; Peter L. Drzal, Auteur Année de publication : 2005 Article en page(s) : p. 583-589 Note générale : Bibliogr. Langues : Américain (ame) Tags : Microscopie  confocale  laser  balayage  Oléfine  polymère  Propriété  esthétique  Etude  expérimentale  Mesure  optique  Durabilité  Dureté  Méthacrylate  de  méthyle  Déformation  plastique  surface  Morphologie  mécanique  Brillant  Matériau  revêtement  Propène  Résistance  rayure Index. décimale : 667.9 Revêtements et enduits Résumé : Current methods for scratch resistance assessment are often based on "relative but not quantitative" types of measurements, such as visual inspection, gloss changes, and changes in gray scale level or lightness. Most results are used for qualitative assessment purposes, which result in the lack of a repeatable and reliable standardized test method for the polymer materials community. To implement a scientifically based standardized test method for quantifying scratch resistance, it is vital to understand the relationships between material mechanical properties, morphology, and appearance (optical properties) of surface and subsurface deformation. In this article, preliminary results from a scratch testing protocol to identify the "onset" of plastic deformation in poly(methyl methacrylate) and poly(propylene) commercial samples are presented. Recent advances in optical scattering measurements to identify the onset of plastic deformation by analyzing specular and off-specular intensities are also presented. DOI : 10.1007/BF02774587 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774587.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3783 [article]

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Microstructure and morphology of amine-cured epoxy coatings before and after outdoor exposures - an AFM study / Xiaohong Gu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 7 (07/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 547-556 Titre : Microstructure and morphology of amine-cured epoxy coatings before and after outdoor exposures - an AFM study Type de document : texte imprimé Auteurs : Xiaohong Gu, Auteur ; Y. C. Jean, Auteur ; Derek L. Ho, Auteur ; Jonathan W. Martin, Auteur ; Eric Byrd, Auteur ; Li-Piin Sung, Auteur ; Aziz Rezig, Auteur ; Joan Jasmin, Auteur ; Bouchra Kidah, Auteur ; David Martin, Auteur ; Mounina Oudina, Auteur ; Tinh Nguyen, Auteur Année de publication : 2005 Article en page(s) : p. 547-556 Note générale : Bibliogr. Langues : Américain (ame) Tags : Dégradation  photooxydante  photochimique  Propriété  chimique  Etude  expérimentale  Diffusion  neutron  centrale  Microscopie  force  atomique  Résistance  intempérie  Méthode  analyse  Durabilité  Epoxyde  résine  Structure  surface  Temps  exposition  Relation  mise  en  oeuvre  propriété  Amine  Durcissement(matière  plastique)  Vieillissement  produit  Matériau  revêtement  Morphologie  Microstructure Index. décimale : 667.9 Revêtements et enduits Résumé : Atomic force microscopy (AFM) has been used to study the morphology and microstructure of an amine-cured epoxy before and after outdoor exposure. Measurements were made from samples prepared in an essentially CO2-free, H2O-free glove box and from samples prepared in ambient conditions. For those prepared in a CO2-free glove box, AFM imaging was conducted on (1) an unexposed air/coating surface, (2) an unexposed coating bulk, (3) an unexposed coating/substrate interface, and (4) a field exposed air/coating surface. For samples prepared in ambient conditions, only the unexposed air/coating surface was investigated. The same regions of the exposed samples were scanned periodically by the AFM to monitor changes in the surface morphology of the coating as UV exposure progressed. Small angle neutron scattering and Fourier transfonn infrared spectroscopy (FTIR) studies were performed to verify the microstructure and to follow chemical changes during outdoor exposure, respectively. The results have shown that amine blushing, which occurs only under ambient conditions, had a significant effect on the surface morphology and microstructure of the epoxy. The surface morphology of the samples prepared under CO2-free, dry conditions was generally smooth and homogeneous. However, the interface and the bulk samples clearly revealed a two-phase structure consisting of bright nodular domains and dark interstitial regions, indicating an inhomogeneous microstructure. Such heterogeneous structure of the bulk was in good agreement with results obtained by small angle neutron scattering of unexposed samples and by AFM phase imaging of the degraded sample surface. The relationship between submicrometer physical changes and molecular chemical degradation is discussed. DOI : 10.1007/s11998-005-0014-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0014-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3802 [article]

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Multiscale physical characterization of an outdoor-exposed polymeric coating system / Xiaohong Gu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

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Optical reflectance of metallic coatings : effect of aluminium flake orientation / Li-Piin Sung in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 932 (09/2002)

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Relating gloss loss to topographical features of a PVDF coating / Jenny Faucheu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 1 (01/2006)  

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Relationship between chemical degradation and thickness loss of an amine-cured epoxy coating exposed to different UV environments / Aziz Rezig in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 3 (07/2006)  

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Scratch behavior of nano-alumina/polyurethane coatings / Li-Piin Sung in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 4 (12/2008)  

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Use of laser scanning confocal microscopy for characterizing changes in film thickness and local surface morphology of UV-exposed polymer coatings / Li-Piin Sung in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 4 (10/2004)  

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Wood surface modification by in-situ sol-gel deposition of hybrid inorganic-organic thin films / Mandla A. Tshabalala in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 4 (12/2007)  

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