Fire Safety Science Digital Archive

In this paper the designing of a mathematical model of processes in the intumescent material based on the epoxy resin modified by ammonia polyphosphate as a foaming agent and as a carbonization agent is discussed. The modeling of foamcoke formation processes which take place during polymer pyrolysis is carried out allowing a liquid phase formation and assuming that polymeric materials contain active and passive components. Active components contain a foaming agent and a polymeric matrix. Chemical reactions of a foaming agent destruction, reactions in a bubble volume and on an inner surface of a bubble (the boundary of foaming agent residues and a polymeric matrix) are considered. The system of differential equations proposed will be solved by a net method. As a result the relations of density, porosity, thermal conductivity and heat capacity in dependence on the composition of a polymeric composite are determined. The mathematical model designed corresponds to the tendency of parameter changes.