Intumescent polypropylene: Interactions between physical and chemical expansion

Bensabath, Tsilla; Sarazin, Johan; Jimenez, Maude; Samyn, Fabienne; Bourbigot, Serge

Document type :

Communication dans un congrès avec actes

Permalink :

http://hdl.handle.net/20.500.12210/11635

Title :

Intumescent polypropylene: Interactions between physical and chemical expansion

Author(s) :

Bensabath, Tsilla [Auteur]

Unité Matériaux et Transformations (UMET) - UMR 8207
Sarazin, Johan [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Jimenez, Maude [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]
Samyn, Fabienne [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]
Bourbigot, Serge [Auteur]

Unité Matériaux et Transformations - UMR 8207 [UMET]

Conference title :

15th International Conference and Exhibition on Fire Science and Engineering

City :

Egham

Country :

Royaume-Uni

Start date of the conference :

2019-07-01

HAL domain(s) :

Chimie/Matériaux
Chimie/Polymères

English abstract : [en]

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 ...
Show more >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.Show less >

Language :

Anglais

Audience :

Internationale

European Project :

MULTI-CONCEPTUAL DESIGN OF FIRE BARRIER: A SYSTEMIC APPROACH

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Ingénierie des Systèmes Polymères

Submission date :

2019-08-28T14:05:34Z
2019-08-28T14:11:17Z
2019-09-18T09:57:24Z

Files

Interflam 2019 - intumescent PP.pdf
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Version	Link	Modification date
4	20.500.12210/11635*	2019-09-18T09:55:01Z
2	20.500.12210/11635.2	2019-08-28T14:07:11Z
1	20.500.12210/11635.1	2019-08-28T14:05:34Z

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Intumescent polypropylene: Interactions ...

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