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Decompression-Induced Chemical Reaction in CL-20.
Xin Zhang1,2,3, Kaiyuan Shi3, Jian Xu3
1Department of Safety Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
Journal of the American Chemical Society
|July 2, 2025
Summary
This study reveals novel pressure-induced decomposition in CL-20 energetic materials during decompression. Shear stress significantly influences reaction pathways, impacting safety and detonation behavior.
Area of Science:
- Materials Science
- Chemical Kinetics
- High-Pressure Physics
Background:
- Energetic materials safety is linked to high-pressure reaction kinetics.
- Chemical decomposition pathways of energetic materials under pressure are underexplored.
- Previous research focused on structural evolution and phase transitions, not decomposition.
Purpose of the Study:
- To investigate pressure-induced chemical reactions in CL-20 during decompression.
- To elucidate the decomposition mechanisms and identify gaseous products.
- To understand the influence of pressure conditions on reaction pathways.
Main Methods:
- Nonhydrostatic and hydrostatic compression using diamond anvil cells.
- Infrared spectroscopy to identify decomposition products.
- Molecular dynamics simulations to model reaction mechanisms.
Main Results:
- A novel pressure-induced chemical reaction in CL-20 was observed during decompression from 26.2 GPa.
- Decomposition products included N2O and CO2, confirmed by IR spectroscopy.
- Molecular dynamics revealed H migration, OH transfer, C-C bond scission, and C-N bond cleavage as initial steps.
- Improved hydrostatic conditions increased the reaction threshold to 30.1 GPa, indicating shear stress influence.
Conclusions:
- This is the first demonstration of decompression-induced chemical reactions in condensed explosives.
- Shear stress plays a critical role in the decomposition of CL-20 under nonhydrostatic conditions.
- Findings provide fundamental insights into energetic material safety, initiation, and detonation.
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