Aging behavior of the reactive chemicalscontaining system

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The aging under long term storage of explosives causes a change in a practical performance or an incidental explosion. In this paper, a delay composition of red lead/ ferrosilicone/antimony trisulfide, nitrocellulose in acid mixtures and a composite solid propellant consisted of ammonium nitrate and polyurethane binder were selected as model sample of aging. As an experimental method, accelerated aging tests carried out at the temperature little higher than a room temperature were adopted. The results obtained are as follows.The delay composition of red lead/ ferrosilicone/ antimony trisulfide caused the decreased in burning rate by aging, which involved the low temperature reaction of red lead with antimony trisulfide. On the other hand, the burning rate of a composite solid propellant consisted of ammonium nitrate, aluminum and glycidyls azide binder increased after aging by the formation of acidic substance from ammonium nitrate and an oxidized intermediate of binder. At last, nitrocellulose in acid mixture caused a sutocatalytic degradation after a long induction period, which was ascribed to the formation of reactive intermediate. From the mechanisms and the temperature dependence of aging, a general idea will be presented to predict the aging behavior of explosives under an normal temperature.