Titre :

Re-examination of the intumescence mechanism of ammonium polyphosphate/pentaerythritol/zeolite 4A fire-retarded formulation using advanced spectroscopic techniques

Auteur(s) :

Caron, Matthieu [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Ben Tayeb Meziane, Karima [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Bourbigot, Serge [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Fontaine, Gaelle [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Titre de la revue :

Journal of Fire Sciences

Nom court de la revue :

J. Fire Sci.

Numéro :

-

Pagination :

-

Date de publication :

2024-05-07

ISSN :

0734-9041

Mot(s)-clé(s) en anglais :

Intumescence
fire reaction
electron paramagnetic resonance
decomposition pathway

Discipline(s) HAL :

Chimie

Résumé en anglais : [en]

The mixture of ammonium polyphosphate and pentaerythritol is a very efficient intumescent system suitable for polyolefins, especially polypropylene. In this article, the intumescence mechanism of this intumescent system ...
Lire la suite >The mixture of ammonium polyphosphate and pentaerythritol is a very efficient intumescent system suitable for polyolefins, especially polypropylene. In this article, the intumescence mechanism of this intumescent system with and without zeolite 4A used as a synergy agent is revisited. The intumescent system was investigated in depth using continuous-wave electron paramagnetic resonance spectroscopy, solid-state nuclear magnetic resonance, and the advanced technique, namely hyperfine sublevel correlation pulsed electron paramagnetic resonance. It was observed that the char generated between 250°C and 350°C is made of polycyclic heterocyclic radicals with nitrogen atoms and that free radicals are mainly generated at these temperatures with a spin concentration relatively stable at least up to 500°C. Moreover, the presence of hydrogen, carbon, nitrogen, and phosphorus was clearly evidenced in the chemical environment of free electrons at 350°C (hyperfine sublevel correlation pulsed electron paramagnetic resonance). Besides, it was also evidenced that 4A totally collapses below 250°C. Contrary to previous works suggesting the presence of aluminosilicophosphate complexes, this work demonstrated that distinct alumino- and silicophosphate complexes are generated and protected the residue at high temperatures.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
• Unité Matériaux et Transformations (UMET) - UMR 8207

Date de dépôt :

2024-05-17T21:01:43Z
2024-06-05T09:48:44Z