Abstract
ABSTRACT In this study, isothermal decomposition kinetic of a triple-base propellant (TBP) has been investigated by vacuum stability test (VST). The volumes of the evolved gas have been recorded step by step to monitor gas evolution in VST at 80°C, 90°C, 100°C, 110°C, 120°C, and 150°C. This semi-continuous data-recording mode makes it possible to use the Berthelot equation for shelf-life prediction of TBP. Activation energy has been calculated in both model-free and model-fitting methods, and F0/R1 is determined as the best model for thermal decomposition of TBP at VST. High-performance liquid chromatography has been used to determine stabilizer (methyl centralite) content of the TBP at various extents of reactions (α). The critical amount of stabilizer was specified at 2% α. Arrhenius average temperatures have been calculated at various climate categories and used as actual storage temperatures. Molecular weight (Mw) reductions of nitrocellulose were determined by gel permeation chromatography during aging. According to the results, the shelf-life of TBP has been estimated using the Berthelot equation at 2% α in various climate categories. Shelf-life of studied TBP differs from 14 to about 36 (years) in extremely hot dry (A1) to intermediate (A3) climate categories.
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