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Polymorphic Phase Control of RDX-Based Explosives.

John J Brady1, Brittney L Argirakis1,2, Alexander D Gordon1,3

  • 11 Transportation Security Laboratory, William J. Hughes Technical Center, Atlantic City, NJ, USA.

Applied Spectroscopy
|May 25, 2017
PubMed
Summary

The dry transfer method enables preparation of the stable α-RDX phase, regardless of solvent or mass loading. This technique is crucial for controlling polymorphism in 1,3,5-trinitro-1,3,5-triazine (RDX) materials.

Keywords:
135-triazine5-trinitro-1C-4RDXRaman scatteringaerosoldrop cast crystallizationdry transferphasepolymorphism

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Area of Science:

  • Crystallography
  • Materials Science
  • Spectroscopy

Background:

  • 1,3,5-trinitro-1,3,5-triazine (RDX) exists in multiple polymorphic forms, impacting its properties.
  • Controlling RDX polymorphism is essential for its reliable application.
  • Raman spectroscopy is a key technique for identifying RDX phases.

Purpose of the Study:

  • To investigate the influence of deposition techniques on RDX polymorphism.
  • To determine methods for selectively obtaining the stable α-RDX phase.
  • To establish a reliable preparation method for α-RDX test articles.

Main Methods:

  • Raman spectroscopy was used to analyze RDX samples.
  • RDX was deposited using drop casting and dry transfer methods.
  • Experiments varied mass loading and solvents to assess their impact on polymorphism.

Main Results:

  • High mass loading via drop casting resulted in a mixture of α-RDX and β-RDX phases.
  • Low mass loading via drop casting yielded only the β-RDX phase.
  • Dry transfer consistently produced the stable α-RDX phase, irrespective of mass loading or solvent.

Conclusions:

  • The dry transfer method is a robust technique for preparing α-RDX.
  • This method overcomes limitations associated with solvent choice and mass loading in RDX preparation.
  • The findings facilitate the controlled synthesis of RDX materials with desired polymorphic characteristics.