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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Macroscopic volume, van der waals volume and free volume after cure versus chemical conversion for a high-Tg epoxy/amine thermosetting system / R. A Venditti in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 844 (05/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 844 (05/1995) . - p. 47-56 Titre : Macroscopic volume, van der waals volume and free volume after cure versus chemical conversion for a high-Tg epoxy/amine thermosetting system Type de document : texte imprimé Auteurs : R. A Venditti, Auteur ; J. K. Gillham, Auteur ; Y. Lou, Auteur ; Y. C. Jean, Auteur Année de publication : 1995 Article en page(s) : p. 47-56 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie Dilatation (thermodynamique) Epoxydes Polyamines Positons -- Annihilation Réticulation (polymérisation) Thermodurcissables Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : sothermal glassy-state properties of cured thermosetting materials pass through maximum and minimum values with increasing chemical conversion. In this work a diglycidyl ether of bisphenol A (a diepoxide) and trimethylene glycol di-p-aminobenzoate (a tetra-functional aromatic diamine) system (DGEBA/TMAB) has been investigated for the purpose of analyzing the behavior after cure of the isothermal properties of the glass with increasing conversion. The glass transition temperature (Tg) is used as a direct measure of conversion. The density, Tg, modulus, and free volume of the material after cure with increasing conversion was measured. The specific volume at 25°C after cure passes through a minimum and the modulus passes through a maximum with increasing conversion (Tg). The fractional fraction free volume at 25°C after cure passes through a minimum value with respect to conversion. The specific volume, modulus, and fractional free volume at 25°C versus conversion data qualitatively correlate Note de contenu : - EXPERIMENTAL : Chemical system - Mixing procedure - Cure procedure - Density measurements - DSC measurements - Thermal expansion coefficient measurements - positron annihilation spectroscopy - RESULTS AND DISCUSSION : Specific volume versus conversion - Packing density at 298K versus conversion - Comparison of van der waals volume and specific volume versus conversion - Free volume versus conversion - Antiplasticization Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18512 [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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