| Titre : |
Photodegradation of water-based acrylic coatings containing silica |
| Type de document : |
texte imprimé |
| Auteurs : |
Alison M. Morrow, Auteur ; Norman S. Allen, Auteur ; Michele Edge, Auteur |
| Année de publication : |
1998 |
| Article en page(s) : |
p. 65-72 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Tags : |
'Peinture eau' 'Dégradation photochimique' Feuil 'Méthacrylate de méthyle copolymère' 'Acrylate butyle Adjuvant Silice 'Mécanisme réaction' Durabilité 'Etude expérimentale' 'Agent matité' |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The durability of acrylic copolymer systems containing silica as a matting agent are investigated, with particular emphasis on the photodegradation process. The effects of the photodegradation process on the films are monitored chemically via reflectance FTIR spectroscopy and UV spectrophotometry and monitored physically via gloss levels, optical properties, film thickness, and film smoothness measurements of the cured film. The findings of this study show that as a result of photo-oxidation high levels of hydroperoxides are observed. In addition the FTIR results, which are discussed from a mechanistic point of view, indicate that functional group formations and crosslinking reactions which occur as a consequence of photodegradation, play a primary role. Therefore, this study suggests that silica can reduce the durability of acrylic based formulations and that the extent of this photodegradation appears to be dependent on silica type. |
| Note de contenu : |
- EXPERIMENTAL : Materials - UV irradiation - Hydroperoxide analysis - FTIR analysis - Cured film properties
- RESULTS AND DISCUSSION : Hydroperoxide analysis - FTIR analysis - Anhydride formation - Lactone formation - Acetophenone formation - Vinyl ketone formation - Vinyl formation - Crosslinking reactions - Cured film properties |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17996 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 880 (05/1998) . - p. 65-72
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Photodegradation of water-based acrylic coatings containing silica in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 880 (05/1998)
