Abstract
During storage of double base rocket propellant (DBRP) several chemical and physical processes occurred at normal storage conditions leading to a decrease in the physicochemical properties as well as the performance of these solid propellants. In this work, the effect of long natural aging (up to 31 years of storage) and artificial aging (for 12 months at 338.65 K) on the chemical stability of three DBRPs have been inspected by spectroscopic techniques, stability tests, kinetic modeling on Vacuum Stabilty Test (VST) data, and the prediction of the lifetimes at different storage temperatures. With natural/artificial aging progress, FTIR and XRD results show a decrease in the intensities of the characteristic frequencies of nitrocellulose (NC) and the crystallinity indexes, respectively. Bergmann & Junk (B&J) test results showed that the unaged samples are stable according to the AOP-7 standard. Nevertheless, the VST results present some issues when compared to the same standard. Furthermore, the VST finding revealed three degradation stages during the aging of the DBRP. Kinetic modeling indicates a decrease in the activation energy value with aging progress and a change in the most probable reaction model after 10 months of artificial aging. The predicated lifetimes showed that the DBRPs could not be stored after 10 months of artificial aging and became hazardous.
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