87.
Chemical reactions which occur on heating fire retardant mixtures of decabromodiphenyloxide (DBDPO) with antimony trioxide (AO) or bismuth carbonate (BC) have been studied by means of weight loss, elemental analysis, X-ray diffraction, scanning electron microscopy (SEM) and energy dispersive system (EDS) microanalysis.
It has been shown that on rapid heating to 700°C, DBDPO volatilisation competes with debromination by AO or BC leading to volatile SbBr3 or BiBr3 which are formed by different mechanisms. BC is rapidly transformed into BiOBr which gives BiBr3 by further debromination of DBDPO. At high conversion (high temperature) this process is in competition with reduction of BiOBr to metallic bismuth. In the case of AO slower formation of progressively bromine-richer antimony oxybromides takes place which liberates SbBr3 by thermal degradation.
The formation of a rod-shaped Br-Sb containing phase is shown to relate to the progression of chemical reactions which occur on heating the AO-DBDPO mixture. 相似文献