Journal
JOURNAL OF MOLECULAR MODELING
Volume 28, Issue 12, Pages -Publisher
SPRINGER
DOI: 10.1007/s00894-022-05377-4
Keywords
RDX; CMDB; ReaxFF MD simulations; Thermal decomposition
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ReaxFF molecular dynamics simulations were used to study the thermal decomposition property of RDX-based CMDB propellants. The simulations showed that the decomposition of RDX and RDX/HTPB/Al was primarily triggered by N-NO2 rupture, leading to different final products. The abundance of intermediate products generated by RDX/HTPB/Al was lower and the reactions were more complex. Additionally, the decomposition rate of RDX/HTPB/Al increased with increasing temperature.
ReaxFF molecular dynamics (ReaxFF MD) simulations were performed to study the thermal decomposition property of cyclotrimethylenetrinitramine (RDX)-based composite modified double base (CMDB) propellants. The intermediate products and final products of the decomposition of RDX-based CMDB propellants at 2000 K, 2500 K, and 3000 K are obtained. The simulation results show that the decomposition of RDX and RDX/HTPB/Al is primary triggered by N-NO2 rupture, and then, the intermedia products undergo a series of complex interactions to form final products. The final products of RDX/HTPB/Al are H-2 and N-2, while the final products of pure RDX are H-2, N-2, and H2O. In addition, the abundance of the main intermediate products generated by RDX/HTPB/Al is lower than that of RDX, in that the reaction between intermediate products is more complex for RDX/HTPB/Al. Moreover, the decomposition rate of RDX/HTPB/Al increases with the increasing temperature.
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