AN577 – Study of the reactivity and stability of organic azides by C80 coupled with gas analysis


Studio della reattività e della stabilità di azidi organiche – L. Gigante – Stazione Sperimentale per i Combustibili – MILAN – ITALY.


Organic azides are involved in fields as different as the vulcanization of rubber, the treatment of glass fibers, or can be used by themselves as antihypertensive or sedative (bio-pharmacy), or as an alternative to nitro compounds (energetic materials). This last application shows how important it is to collect thermal hazard information about these compounds.



The above experiments was conducted on a C80 at a heating rate of 0,5 K/min between room temperature and 280 °C. 76 mg of sample where placed inside a glass liner perfectly fitting the C80 high pressure measurement cell. The C80 was then cooled down, and the permanent decomposition gases were sent to a gas analyzer cell (FTIR).


The complex two-step decomposition of o-trifluoromethyl phenyl azide was studied thanks to a combination of calorimetric, pressure, and evolved gas analysis data. Not only thermal and pressure hazards can be assessed, but also the risks linked with the formation of toxic gases – or straightforward information about decomposition mechanisms. For example, the strange silane – based gas detected by the FTIR was assigned to a reaction between the sample and the glass liner.