Influence of trans 1,4,5,8-tetranitrosotetraazadecalin on mechanical integrity and microstructure of composite modified double base propellant
DOI:
https://doi.org/10.54939/1859-1043.j.mst.IMBE.2025.36-42Keywords:
Ballistite propellant; Trans-1,4,5,8-tetranitrosotetraazadecalin; Dynamic mechanical analysis (DMA); Composite modified double base propellant; Energetic additives.Abstract
This study investigates the influence of trans-1,4,5,8-tetranitrosotetraazadecalin (TNSTAD) (20-30% loadings) on the mechanical properties of composite modified double base (CMDB) propellant. A counterintuitive finding emerged: TNSTAD simultaneously enhances both stiffness (storage modulus) and mechanical damping (tan δ). Dynamic Mechanical Analysis (DMA) revealed a 14% increase in the tan δ peak, signaling new energy dissipation, while the rubbery-state modulus nearly doubled. Notably, the α-transition width (FWHMα) narrowed significantly (36.0 °C to ~ 25 °C), suggesting a more homogeneous relaxation spectrum due to uniform stress fields created by well-dispersed particles. Quasi-static tests confirmed significant reinforcement tensile strength increased by 33.7% and Young's modulus doubled, albeit with a 64% reduction in ductility. SEM fractography identified weak interfacial adhesion and debonding as primary failure mechanisms. We propose that interfacial frictional sliding at these weak interfaces is responsible for the enhanced damping. Despite the damping-ductility trade-off, TNSTAD yields a favorable stiffness-damping balance, promising improved stability and vibration tolerance.
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