The results of investigation of the degradation process of polystyrene brominated on the ring via an ionic route have been
presented. Using thermogravimetric (TG) and differential thermal analysis (DTA) methods, the course of degradation of polymer
samples with different bromine content has been described. Introducing of bromine on the aromatic ring influenced the initial
decomposition temperature (IDT) and the temperature corresponding to the maximum of decomposition rate (Tm).
The samples have been pyrolyzed at 300°C and some pyrolysis products were identified by means of gas chromatography/mass spectrometry.
Finally, the possible mechanism of degradation was presented.