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Organisationseinheit der BAM
The pyrolysis and the fire behaviour of PC/ABS containing various aryl phosphates and their combinations with aluminium hydroxide oxide, talc and zinc borate were investigated. Main interest was focused on the flame retardant effect and mechanism of aryl phosphates (e.g. BDP) in PC/ABS, especially in combination with the other additives. Therefore the thermal and thermo oxidative decomposition was characterised by the means of thermogravimetry analysis and thermogravimetry coupled with infrared Fourier transform spectroscopy (TG-FTIR). The results were verified with further methods, e.g. pyrolysis-gaschromatography/mass spectroscopy (Py-GC/MS). Kinetic analysis and evolved gas analysis were used to study the pyrolysis mechanisms and to expose existent synergisms in the combined systems. The fire behaviour was investigated by cone calorimeter. The flammability was determined by LOI and UL 94. The chemical compositions of the residues were also examined.
The exploration of condensed phase mechanisms such as charring and intumescence has been pushed forward in the last decades, since it is believed that focusing on these concepts will bring materials closer to an efficient and ecologically friendly fire retardancy. They promise to concentrate efficient fire retardancy at the key position between pyrolysis zone and gas phase. Examples of residue/char forming and intumescent materials are used to illustrate the influence of mass and heat barrier effects on the fire behavior of materials and general results are presented. A comprehensive understanding of the mechanisms and structure-property relationships in fire retardancy is presented.