CARBONIZATION MECHANISMS RESULTING FROM INTUMESCENCE .2. ASSOCIATION WITH AN ETHYLENE TERPOLYMER AND THE AMMONIUM POLYPHOSPHATE PENTAERYTHRITOL FIRE-RETARDANT SYSTEM

In this work we study the carbonization resulting from an intumescence phenomenon of the fire-retardant formulation: ethylene terpolymer-ammonium polyphosphate/pentaerythritol. Characterisation of the intumescent coating is carried out using infrared spectroscopy and MAS-NMR of the solid state. The study shows the formation of organic phosphocarbonaceous esters, which limits depolymerisation or the evolution of gaseous hydrocarbons. These esters prevent the development of condensed polyaromatic structures. These latter are bridged by the polyethylenic links, which provide the mechanical properties of interest in the protective shield.