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| Content Provider | EDP Sciences |
|---|---|
| Author | Xavier Colin Bruno Fayolle Jacques Cinquin |
| Abstract | Le modèle cinétique mis au point pour décrire la thermo-oxydation de plusieurs substrats polyméthyléniques linéaires, dans des études antérieures menées au laboratoire PIMM, a été généralisé avec succès aux matrices époxy-diamine (EPO-DA) dans le cadre du projet de recherche « COMPosites Tièdes et INNovants » financé par le Fonds Unique Interministériel (FUI COMPTINN). Il est dérivé d’une réaction en chaîne radicalaire amorcée par décomposition des hydroperoxydes qui se propage par l’intermédiaire des liaisons C-H situées en α des hétéroatomes (O et N). De plus, il couple la diffusion d’oxygène et sa consommation chimique dans une équation bilan, donnant ainsi accès aux profils des évènements chimiques dans l’épaisseur des échantillons ainsi qu’à leur évolution au cours du temps. Les différents paramètres de ce modèle ont été identifiés avant de vérifier son pouvoir prédictif. D’une part, les propriétés de transport d’oxygène ont été compilées de la littérature ou déterminées par perméation d’oxygène au laboratoire. D’autre part, les constantes de vitesse et les rendements des actes chimiques élémentaires ont été déterminés par méthode inverse à partir d’essais de thermo-oxydation menés entre 0,21 et 20 bars d’oxygène et entre 120 et 200 ◦C sur des films minces de matrice TACTIX. Au final, le modèle prédit fidèlement les valeurs des critères de vieillissement rapportées dans la littérature pour les matrices EPO-DA ou mesurées dans le cadre de ce projet de recherche, comme la vitesse maximale d’oxydation, la pression d’oxygène critique ou l’épaisseur de la couche oxydée. |
| Page Count | 10 |
| File Format | HTM / HTML PDF |
| ISSN | 00326895 |
| Alternate Webpage(s) | https://www.mattech-journal.org/articles/mattech/abs/2016/02/mt150090/mt150090.html |
| e-ISSN | 17783771 |
| Issue Number | 2 |
| Journal | Matériaux & Techniques |
| Volume Number | 104 |
| DOI | 10.1051/mattech/2016008 |
| Language | French |
| Publisher | EDP Sciences |
| Publisher Date | 2016-01-01 |
| Access Restriction | Subscribed |
| Rights Holder | © EDP Sciences, 2016 |
| Subject Keyword | Matrice époxy-diamine thermo-oxydation modèle cinétique pression partielle d’oxygène Epoxy-diamine matrix / thermal oxidation / kinetic model / oxygen partial pressure |
| Content Type | Text |
| Resource Type | Article |
| Subject | Materials Science |
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