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Advanced techniques for nanocharacterization of polymeric coating surfaces / Xiaohong Gu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 3 (07/2004)
[article]
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 -- AnalyseIndex. 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3899
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Code-barres Cote Support Localisation Section Disponibilité 000587 - Périodique Bibliothèque principale Documentaires Disponible Computer analysis of a polymer coating exposed to field weather conditions / Doug Burch in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 924 (01/2002)
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Titre : Computer analysis of a polymer coating exposed to field weather conditions Type de document : texte imprimé Auteurs : Doug Burch, Auteur ; Jonathan W. Martin, Auteur ; Mark R. VanLandingham, Auteur Année de publication : 2002 Article en page(s) : p. 75-86 Note générale : Bibliogr. Langues : Américain (ame) Tags : Simulation numérique Modélisation Transfert masse chaleur Feuil Dégradation photochimique Exposition intempérie Peinture Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A heat and moisture transfer model was used to study weathering of polymeric materials, such as paint, asphalt, sealants, plastics, textiles, and poly meric composites. Three damage indices, related to temperature changes, humidity changes, and time of wetness, respectively, were introduced to quantify adverse effects of climate. The variation of these indices was investigated for a hot and humia climate (Miami, FL) and a hot and dry climate (Phoenix, AZ). In addition, the relative effects of solar radiation, surface wetting by rain and dew condensation, and variations in outdoor tempera ture and relative humidity on the three damage indices were investigated. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5684
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Code-barres Cote Support Localisation Section Disponibilité 001233 - Périodique Bibliothèque principale Documentaires Disponible 001232 - Périodique Bibliothèque principale Documentaires Disponible Degradation modes of crosslinked coatings exposed to photolytic environment / Tinh Nguyen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)
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Titre : Degradation modes of crosslinked coatings exposed to photolytic environment Type de document : texte imprimé Auteurs : Tinh Nguyen, Auteur ; Xiaohong Gu, Auteur ; Mark R. VanLandingham, Auteur ; Eric Byrd, Auteur ; Rose Ann Ryntz, Auteur ; Jonathan W. Martin, Auteur Année de publication : 2013 Article en page(s) : p. 1-14 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fourier, Spectroscopie infrarouge à transformée de
Microscopie à force atomique
Photochimie
Photodétérioration
Polymères réticulés
Revêtements -- Détérioration
Revêtements -- Effets du rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : The objective of this study is to assess the degradation modes of crosslinked coatings exposed to photolytic environments. Three model crosslinked coatings were exposed in various ultraviolet environments. Atomic force microscopy and Fourier transform infrared spectroscopy were used in following nanoscale physical and chemical degradation during exposures. Results indicated that photodegradation of crosslinked coatings is a spatially localized (inhomogeneous) process in which nanometer-sized pits are initially formed; these pits deepen and enlarge with exposure. A conceptual model is proposed to explain the inhomogeneous degradation mode. The model proposes that nanosize “hydrophilic” domains are dispersed randomly with the highly crosslinked units. These hydrophilic domains, which are energetically preferred, comprise polar, unreacted and partially polymerized molecules, chromophores, and other additives. Photodegradation initiates at degradation-susceptible hydrophilic domains spreading to surrounding areas contiguous with the initiation site. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and sample preparation - exposures and apparatus - Degradation measurements
- RESULTS AND DISCUSSION : Amine-cured epoxy - Acrylic urethane - Acrylic melamine
- CONCEPTUAL MODEL FOR THE INHOMOGENEOUS DEGRADATIONDOI : 10.1007/s11998-012-9455-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9455-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17467
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Code-barres Cote Support Localisation Section Disponibilité 14636 - Périodique Bibliothèque principale Documentaires Disponible 15124 - Périodique Bibliothèque principale Documentaires Disponible On the use of the atomic force microscope to monitor physical degradation of polymeric coating surfaces / Mark R. VanLandingham in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 923 (12/2001)
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Titre : On the use of the atomic force microscope to monitor physical degradation of polymeric coating surfaces Type de document : texte imprimé Auteurs : Mark R. VanLandingham, Auteur ; Jonathan W. Martin, Auteur ; Eric Byrd, Auteur ; Tinh Nguyen, Auteur Année de publication : 2001 Article en page(s) : p. 43-50 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Essai vieillissement accéléré Mélamine résine Acrylique dérivé polymère Microscopie force atomique Dégradation Feuil Polymère Peinture Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : The atomic force microscope (AFM) was used to monitor changes in surface features of an acrylic melamine coating that was exposed to a variety of conditions. Exposure to ultraviolet (UV) radiation and high relative humidity caused general roughening of the surface and the formation of pits. Further, the damage of the coating surface was much more substantial for exposure to high relative humidity compared to exposure to dry environments. This difference in degradation rates correlated with measurements of chemical degradation determined using infrared spectra that were acquired along with the AFM images. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5770
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Code-barres Cote Support Localisation Section Disponibilité 001231 - Périodique Bibliothèque principale Documentaires Disponible