Russian Federation
UDC 544.42
The possibility of ignition of polymeric materials under fire conditions depends on their chemical nature and kinetic parameters of the thermo-oxidative degradation process obtained in the study of materials under conditions as close as possible to fire conditions. The kinetics of thermo-oxidative degradation of thermoplastic polymers with different degrees of crystallinity (polypropylene, cellular polycarbonate, polyvinyl chloride, polystyrene foam, polyethylene terephthalate) was studied using the dynamic thermogravimetry method at a heating rate of 20 °K·min‒1. The aim of the study was to assess the applicability of the Broydo method for determining the kinetic parameters (activation energy, pre-exponential factor, reaction order) of the thermo-oxidative degradation process for further diagnostics of their ignition. The results of the studies showed that the order of the reactions of thermo-oxidative degradation of the studied polymers is equal to or close to unity. To diagnose the applicability of the Broydo method to the description of the kinetics of the thermo-oxidative degradation of polymers, the linearity of the graphical dependencies in the specified coordinates was checked. The possibility and expediency of using the Broido method as a simple and reliable for assessing the kinetic parameters of the process of thermo-oxidative destruction of polymers has been proven.
thermal-oxidative destruction, thermoplastic polymers, thermogravimetric analysis, activation energy, secondary fire sources
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