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Science and Technology of Energetic Materials

Vol.71, No.1 (2010)

Research paper

The effects of conventional stabilizers and phenolic antioxidants on the thermal stability of nitroglycerine
Katsumi Katoh, Masaru Nakahama, Shuhei Kawaguchi, Yuji Wada, Yuji Ogata, and Mitsuru Arai
p.17-23

Abstract

To estimate the effects of conventional stabilizers and phenolic antioxidants on the thermal stability of nitroglycerine (NG), the thermal behaviors of mixtures of NG with diphenylamine (DPA), ethyl centralite (EC), Akardite II (AKII), (2-nitrophenyl) phenylamine (2-NO2-DPA), two commercial hindered phenolic compounds (BPhin) and (BPsemi) used as antioxidants for polymers, 2,6-di-tert-butyl-4-methylphenol (BHT), and hydroquinone (HQ) were monitored during isothermal storage by using a C80 microcalorimeter. The effect of these compounds in prolonging the induction period of the main exothermic reaction was AKII > DPA≈EC > 2-NO2-DPA≈BHT≈BPhin > BPsemi > HQ, whereas the order in decreasing the maximum rate of heat release was DPA≈BHT > AKII > 2-NO2-DPA≈EC≈BPhin > BPsemi > HQ. However, NG with DPA or BHT released small amounts of heat before the main exothermic reaction. We therefore consider that AKII is most effective stabilizer for NG. In addition, BPhin has a stabilizing effect that is almost identical to that of 2- NO2-DPA. Further investigation may reveal that phenolic compounds could be used as stabilizers for nitric acid esters.

Keywords

Self-ignition, Spontaneous ignition, Nitric acid ester, Antioxidant, Stabilizer.

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