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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]
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 -- DétériorationIndex. 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10919
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 19-33[article]Réservation
Réserver ce documentPigment and nanofiller photoreactivity database / Stephanie Watson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)
[article]
Titre : Pigment and nanofiller photoreactivity database Type de document : texte imprimé Auteurs : Stephanie Watson, Auteur ; I-Hsiang Tseng, Auteur ; Tarek Marray, Auteur ; Bastien Pellegrin, Auteur ; Julien Comte, Auteur Année de publication : 2012 Article en page(s) : p. 443-451 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux)
Dioxyde de titane
Nanoparticules
Photoréactivité
Pigments inorganiques
Radicaux libres (chimie)
Spectroscopie de résonance paramagnétique électroniqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The service life and durability of nanocomposites containing fillers are affected by photocatalytic properties of these fillers, particularly narrow band gap metal oxides (NBMOs) such as titanium dioxide (TiO2). When irradiated with ultraviolet flux, NBMOs produce electrons and other species that are capable of causing rapid degradation of organic materials with which they are in contact. Electrons and holes (positively charged species) migrate to the surface and react with species to generate various free radicals. Measurement science tools for characterizing TiO2 photoreactivity using electron paramagnetic resonance (EPR) methods have been developed by the Engineering Laboratory (EL) at the National Institute of Standards and Technology (NIST) and a linkage between EPR measurements and current industrial methods has been established. A database of TiO2 photoreactivity values and other data measured via the EPR methods and industrial assays has been compiled and will be accessed through a searchable software database in the NIST Standard Reference Database program—http://www.nist.gov/srd/index.cfm. The database provides fundamental photoreactivity data that can be used for product selection and development purposes to enable more reliable assessments of end-performance. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Chemical assays - EPR spectroscopy
- RESULTS AND DISCUSSION : Conventional industrial assays - EPR spectroscopyDOI : 10.1007/s11998-012-9408-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9408-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16002
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 4 (07/2012) . - p. 443-451[article]Réservation
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