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New approach to the dynamic properties of an intumescent material

✍ Scribed by Michel Bugajny; Dr. Michel Le Bras; Serge Bourbigot

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
169 KB
Volume
23
Category
Article
ISSN
0308-0501

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✦ Synopsis

This work studies a polypropylene/ammonium polyphosphate/polyurethane intumescent 5re retardant material. It reports the foaming expansion under a normal strain and the variation of the apparent viscosity of the heat-treated material measured using a plate}plate rheometer. The loss of the protective character of the intumescent coating is discussed. It is proposed that it is related to a limited foaming expansion value, an increase of its apparent initial viscosity and a decrease of this viscosity with time when a normal force and a sinusoidal strain are both applied. The changes in the dynamic properties of the system are explained by the chemistry of the intumescence process.

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