| Titre : |
Photodegradation of fluorocarbon resin films |
| Type de document : |
texte imprimé |
| Auteurs : |
Teiichi Suzuki, Auteur ; Takahiro Tsujita, Auteur ; Shingo Okamoto, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 118-122 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The mechanism of photodegradation and a new evaluation method in the weathering test on PVdF (polyvinylidene fluoride) / PMMA (polymethyl methacrylate) resin paint films were studied. ESR spectrometer was used to determine radical species and their spin numbers generated in the films by UV-irradiation. Radicals generated at room temperature were identified as-CH2C(COOCH3)CH3 on the basis of the g-value and the hyperfine structure. It was found that the greater the fraction of PMMA in the film was, the higher the spin number became. The spin number was also influenced by the atmosphere in ESR measurement. The spin number increased rapidly and attained to the nearly constant value in N2. In the air or O2, on the other hand, it decreased after gained a maximum value. Hydrogen radicals were also found in the film by the UV-irradiation at -196°C. From these results, the mechanism of the photodegradation of the paint film was assumed that the main chain of C-C bonds of PMMA was broken to produce MMA. radials, followed by addition of oxygen to the radicals. Also, the fewer spin number and higher gloss retention were found on the film with higher fraction of PVdF. |
| Note de contenu : |
- Experimental - Materials and preparation of the paint samples - ESR measurement - Outdoor exposure test
- Results and discussion - Radical spin numbers - Photodegradation mechanism of the fluorocarbon resin films - Radical spin numbers and out-door exposure test |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11282 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 3/96 (03/1996) . - p. 118-122
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Photodegradation of fluorocarbon resin films in EUROPEAN COATINGS JOURNAL (ECJ), N° 3/96 (03/1996)
