TY - JOUR
T1 - Effect and mechanism of lithium aluminium hydride on the pyrolysis process of RDX
AU - Fang, Zhuqing
AU - Li, Shukui
AU - Liu, Jiping
AU - Yu, Chuang
AU - Zheng, Dongsen
AU - Qiao, Meizhuang
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10
Y1 - 2022/10
N2 - Searching for efficient additives for explosives and propellants is always desirable but challenging. To understand the contribution of lithium aluminium hydride (LiAlH4) to the decomposition process of cyclotrimethylenetrinitramine (RDX), the thermal decomposition behaviours of RDX with various ratios of LiAlH4 addition were investigated by thermogravimetric-differential scanning calorimetry (TG-DSC). The main pyrolysis gas products of RDX, RDX/LiAlH4 (4:1) and RDX/LiAlH4 (1:1) were compared by combining thermogravimetric-Fourier infrared spectroscopy (TG-FTIR) and thermogravimetric-photoionization mass spectrometry (TG-MS) techniques, and the influence of LiAlH4 on the main RDX pyrolysis pathways was analysed. The results show a strong interaction between LiAlH4 and RDX during thermal decomposition, and the decomposition peak temperature of RDX decreases from 239.8 °C to about 166.4 °C coupled with explosive decomposition. In the presence of LiAlH4, the active hydrogen of the melted LiAlH4 interacts with the nitro-oxygen of RDX, significantly decreasing the decomposition temperature of RDX and changing the decomposition pattern. This study contributes to further insight into the pyrolysis properties and decomposition mechanism of nitramine energetic materials in the presence of metal hydrides.
AB - Searching for efficient additives for explosives and propellants is always desirable but challenging. To understand the contribution of lithium aluminium hydride (LiAlH4) to the decomposition process of cyclotrimethylenetrinitramine (RDX), the thermal decomposition behaviours of RDX with various ratios of LiAlH4 addition were investigated by thermogravimetric-differential scanning calorimetry (TG-DSC). The main pyrolysis gas products of RDX, RDX/LiAlH4 (4:1) and RDX/LiAlH4 (1:1) were compared by combining thermogravimetric-Fourier infrared spectroscopy (TG-FTIR) and thermogravimetric-photoionization mass spectrometry (TG-MS) techniques, and the influence of LiAlH4 on the main RDX pyrolysis pathways was analysed. The results show a strong interaction between LiAlH4 and RDX during thermal decomposition, and the decomposition peak temperature of RDX decreases from 239.8 °C to about 166.4 °C coupled with explosive decomposition. In the presence of LiAlH4, the active hydrogen of the melted LiAlH4 interacts with the nitro-oxygen of RDX, significantly decreasing the decomposition temperature of RDX and changing the decomposition pattern. This study contributes to further insight into the pyrolysis properties and decomposition mechanism of nitramine energetic materials in the presence of metal hydrides.
KW - Decomposition mechanism
KW - LiAlH
KW - RDX
KW - Thermal decomposition
UR - http://www.scopus.com/inward/record.url?scp=85137293545&partnerID=8YFLogxK
U2 - 10.1016/j.jaap.2022.105690
DO - 10.1016/j.jaap.2022.105690
M3 - Article
AN - SCOPUS:85137293545
SN - 0165-2370
VL - 167
JO - Journal of Analytical and Applied Pyrolysis
JF - Journal of Analytical and Applied Pyrolysis
M1 - 105690
ER -