The study of the photooxidation mechanism of crosslinked polyesters used for flat steel coating can be based on the analysis of photoproducts at the molecular scale: these photoproducts are formed in the matrix under exposure in an accelerated photoageing chamber SEPAP 12–24. Hydroxy functionalized aliphatic polyesters crosslinked with highly methoxy methylated melamines or aliphatic blocked polyisocyanates have been examined. The different photoproducts involved in the oxidative evolution have been identified using FTIR spectroscopy and chemical derivatization treatments. Physical changes have been examined by DMTA analysis on free polymer films. Mechanisms accounting for the photooxidation of each crosslinked system was proposed, involving both chain oxidation and crosslink scissions. Crosslinking due to radical recombinations have been shown to occur in the oxidized matrix.
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30 January 1996
The proceedings of the 53rd international meeting of physical chemistry: Organic coatings
Jan 1995
Paris, France
Research Article|
January 30 1996
Photooxidation mechanism of aliphatic crosslinked polyesters used for flat steel coating
Pierre Delorme;
Pierre Delorme
Laboratoire de Photochimie Moléculaire et Macromoléculaire URA CNRS 433 Ensemble Universitaire des Cézeaux F‐63177 Aubière Cedex
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Jacques Lemaire;
Jacques Lemaire
Laboratoire de Photochimie Moléculaire et Macromoléculaire URA CNRS 433 Ensemble Universitaire des Cézeaux F‐63177 Aubière Cedex
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Francçoise Carrara;
Francçoise Carrara
CED Sollac, BP 109 F‐60761 Montataire Cedex
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Claude Bonnebat
Claude Bonnebat
CED Sollac, BP 109 F‐60761 Montataire Cedex
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AIP Conf. Proc. 354, 413–423 (1996)
Citation
Pierre Delorme, Jacques Lemaire, Francçoise Carrara, Claude Bonnebat; Photooxidation mechanism of aliphatic crosslinked polyesters used for flat steel coating. AIP Conf. Proc. 30 January 1996; 354 (1): 413–423. https://doi.org/10.1063/1.49436
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