| Titre : |
Validation of the reciprocity law for coating photodegradation |
| Type de document : |
texte imprimé |
| Auteurs : |
Joannie W. Chin, Auteur ; Tinh Nguyen, Auteur ; Eric Byrd, Auteur ; Jonathan W. Martin, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 499-508 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Tags : |
Loi Schwarzschild Aminoplaste Propriété chimique Etude expérimentale Spectrométrie FTIR comparative Prédiction réciprocité Modélisation Résistance intempérie Durabilité Mécanisme réaction Dose rayonnement Temps exposition Acrylique dérivé polymère Mélamine résine Vieillissement accéléré produit Dégradation photochimique Matériau revêtement |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Accelerating the photodegradation of commercial polymeric materials has great practical importance in the weathering community. However, questions exist as to whether high radiant flux exposure results can be extrapolated to in-service exposure levels. Based on the reciprocity law, the photoresponse of a material is dependent only on the total energy to which the specimen is exposed, and is independent of the exposure time and the intensity of the radiation taken separately. An experiment to validate the applicability of the reciprocity law for polymeric coatings has been carried out using the NIST integrating sphere-based ultraviolet (UV) weathering device. A nonpigmented, non-UV stabilized acrylicmelamine coating was exposed to six different UV radiation intensities ranging from 36 W/m2 to 322 W/m2, and in the spectral region between 290 nm and 400 nm. Chemical changes in the coating due to UV exposure were measured with transmission Fourier transform infrared (FTIR) spectroscopy and UV-visible spectroscopy. Using two dose-damage models, the reciprocity law photo response for this polymeric system was verified for different photodegradation mechanisms, including chain scission, oxidation, and mass loss. |
| DOI : |
10.1007/s11998-005-0009-7 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0009-7.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3797 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 499-508
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Validation of the reciprocity law for coating photodegradation in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 7 (07/2005)
