Accéder directement au contenu Accéder directement à la navigation
Communication dans un congrès

Intumescent polypropylene: Interactions between physical and chemical expansion

Abstract : To decrease the reaction to fire of a highly flammable plastic, i.e. polypropylene (PP), the concept of intumescence was applied. Two types of intumescent systems were designed, based on different mechanisms: physical expansion with expandable graphite (EG) and chemical expansion with modified ammonium polyphosphate (AP). Fire behavior of PP containing EG, AP or an AP/EG mixture with a total loading of 10wt% was evaluated by cone calorimetry at 35 kW.m-2. In addition, thermocouples allowed measuring the temperature at the backside or inside samples as a function of time and evaluating the thermal barrier of these intumescent materials. Two grades of AP (difference in composition) and several grades of EG (difference in expansion characteristics) were compared. Mixing AP and EG does not create a synergistic effect in studied conditions. Contrarily, the incorporation of small amount of EG in PP-AP modifies heat transfer in the coating, creating a strong anisotropy. Graphite worms are trapped vertically into the expanded AP, which increases the transverse heat conductivity (lower efficiency of the thermal barrier) and decreases the fire performance. This phenomenon disappears in thicker specimens. While a higher expansion volume of graphite worms improves fire performances of PP with only small amount of EG (1wt%), this effect is not noticeable with AP/EG mixtures.
Type de document :
Communication dans un congrès
Liste complète des métadonnées
Contributeur : LillOA Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : mercredi 18 septembre 2019 - 11:57:28
Dernière modification le : jeudi 24 mars 2022 - 03:42:21
Archivage à long terme le : : dimanche 9 février 2020 - 00:39:06


Interflam 2019 - intumescent P...
Fichiers produits par l'(les) auteur(s)


  • HAL Id : hal-02291136, version 1



Tsilla Bensabath, Johan Sarazin, Maude Jimenez, Fabienne Samyn, Serge Bourbigot. Intumescent polypropylene: Interactions between physical and chemical expansion. 15th International Conference and Exhibition on Fire Science and Engineering, Jul 2019, Egham, United Kingdom. ⟨hal-02291136⟩



Consultations de la notice


Téléchargements de fichiers