Iranian Scientific Association of Energetic Materials

In this article the aging of HTPB based composite solid propellants have been studied by Van’t Hoff method. The F-factor of Van’t Hoff equation was calculated by dynamic mechanical analysis (DMA) for reference propellants sample that was equal 2.5. Then the accelerated aging program conditions have been determined by Van’t Hoff equation. According to accelerated aging program the reference propellant samples subjected temperature range between 25°C and 80°C so that the aging time equal 2 years at 25°C. The change in dynamic mechanical properties, including the storage modulus (E') and loss factor or damping efficiency (tanδ) with time and temperature was used to assessment the aging behaviour of composite solid propellant. The result showed that storage module increased with time whereas loss factor decreased.