Safe shelf life of single-base propellants Tempo de vida útil de propelentes base-simples
Tipo
Artigo
Data de publicação
2008
Periódico
Quimica Nova
Citações (Scopus)
3
Autores
Andrade J.
Iha K.
Rocco J.A.F.F.
Pinheiro G.F.M.
Moreira E.D.
Suarez-Iha M.E.V.
Iha K.
Rocco J.A.F.F.
Pinheiro G.F.M.
Moreira E.D.
Suarez-Iha M.E.V.
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Resumo
The purpose of this work was to determine the safe shelf life of single-base propellants. The kinetic parameters relative to the consumption of the stabilizer diphenylamine (DPA) added to the propellant were determined as a function of the storage and ageing time. High Performance Liquid Chromatography (HPLC) with spectrophotometric detection was used to determine the DPA percentage before and after the artificial ageing at 60, 70 and 80°C. The experimental data were very well adjusted to a pseudo-first order kinetic model and the respective kinetic constants are 8.0·10-3 day -1 (60°C); 1.9·10-2 day-1 (70°C); 1.2·10-1 day-1 (80°C). The activation energy was calculated as 130_-kJ mol-1 and the half-time for depletion of the DPA at the hypothetical temperature of 40°C of storage was estimated as being 6 years.