Science and Technology of Energetic Materials

Vol.74, No.6 (2013)

Research paper

Thermal decomposition behavior and mechanical sensitivity of 6-azido-6-deoxy curdlan
Katsumi Katoh, Eiko Higashi, TokoTada, Teruaki Hasegawa, Haruka Abe, Kazumi Izawa, Satoshi Kawata, and Katsuyuki Nakano


For the evaluation of the explosion hazard of 6-azido-6-deoxy curdlan (AC), its thermal decomposition behavior and mechanical sensitivity were investigated. In differential scanning calorimetry (DSC) at a heating rate of 10 K•min-1, the onset temperature (TDSC) of the exothermic peak of AC was observed at 200℃, and its heat amount (QDSC) was 1.55 kJ•g-1. On the basis of results such as the differences in the IR spectra before and after heating, it is suggested that AC released heat by oxidation at low temperatures prior to the main decomposition step. In the mechanical sensitivity test according to JISK4810, AC was categorized as Class 5 in terms of drop-hammer sensitivity and Class 7 in terms of friction sensitivity. In the friction sensitivity test, a flash was emitted at the instant when AC experienced frictional force. For the evaluation of the mixing hazards, the thermal behaviors of AC with metals (iron, copper, aluminum, and ferric oxide), oxidizers (ammonium nitrate (AN) and ammonium perchloride (AP)), and H2SO4 and NaOH aqueous solutions were investigated using DSC. The results showed that TDSC of AC decreased with H2SO4 and NaOH aqueous solutions, and QDSC of AC with AN and AP increased in comparison with that of AC alone.

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orgnic azides, self-reactive substances, mixing hazard, DSC, sensitivity test

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