Modeling study on the combustion of intumescent fire-retardant polypropylene

Abstract

Abstract. The heat transfer and burning behavior of intumescent fire-retardant polypropylene were studied by cone calorimeter at heat flux levels of 50 kW·m -2 to establish an essential physical model for the intumescence process in fire. A mathematical model for the burning process of fire-retardant intumescent polymer was put forward based on the assumption that an intumescent front existed between the char layer and virgin layer. The model emphasizes the thermodynamic aspect of the intumescence process and a corresponding submodel is presented. Meanwhile the thicknesses and mass loss rates of the intumescent polypropylene during burning were measured for the validation of the modeling results. Thermal conductivity and heat capacity of polymer material were also measured as input parameters of the model. The validation results showed that the intumescent thicknesses and mass loss rates predicted by the model were in good agreement with the experimental results. The model was also used to predict the temperature distribution across the sample thickness during burning. The study shows that the present model can appropriately describe the intumescent behavior of the polymer and numerically predict its mass loss rates and temperature distribution in fire.

Non-isothermal degradation kinetics of filled with rise husk ash polypropene composites

“…Thermogravimetric analysis (TGA) is one of the thermal analysis techniques used to measure the mass change, thermal decomposition and thermal stability of composite materials. Overall kinetics can be easily obtained by measuring the change in mass of a sample with time based on isothermal or non-isothermal thermogravimetric data [2,4,8,19,[26][27][28][29]. Some valuable parameters, such as apparent activation energy E, pre-exponential factor A, and reaction order n can be calculated from a thermogravimetric curve.…”

Experimental and Numerical Study of the Thermal Decomposition of an Epoxy-based Intumescent Coating

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Fire retardancy and environmental assessment of rubbery blends of recycled polymers

“…Even if a material basically is flameretardant under forced burning conditions it will more or less decompose. The forced burning can be modelled either by oxygen consumption cone [41] or mass loss calorimeter. The evolved gases can be piped in the measuring cell of an FTIR spectrometer and analysed in line throughout the burning process.…”