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Decompression-Induced Chemical Reaction in CL-20.

Xin Zhang1,2,3, Kaiyuan Shi3, Jian Xu3

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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.

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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.