Combustion Characteristics and Parameter Sensitivity of Flexible Polyurethane Foam
The flexible polyurethane foam(FPUF)combustion is studied by fire propagation ap-paratus(FPA)with different radiant heat fluxes and sample thicknesses.The results show that FPUF combustion can be divided into three stages:the first stage is mainly FPUF pyrolysis and toluene diisocyanate(TDI)combustion,the second stage mainly polyol combustion,and the third stage mainly char oxidation.A mass response model is established by the Box-Behnken design method.The results of variance analysis show that the sensitivity of the mass model to the single parameter is:sample bottom temperature＞radiant heat flux＞sample thickness;and the sensitivity of the mass model to the combined effects of multiple parameters is:sample bot-tom temperature x sample thickness＞sample bottom temperature squared＞sample thickness squared.
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