Accession Number:

ADA275393

Title:

Insensitive Energetic Materials: The Importance of Physical Properties and Molecular Structure

Descriptive Note:

Final rept. 17 Apr 90-30 Sep 93,

Corporate Author:

SANDIA NATIONAL LABS LIVERMORE CA COMBUSTION RESEARCH FACILITY

Personal Author(s):

Report Date:

1993-12-22

Pagination or Media Count:

11.0

Abstract:

A summary of the most important findings on the thermal decomposition of five cyclic nitramines is presented. The compounds studied include octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine HMX, hexahydro-1,3,5- trinitro-striazine RDX, hexahydro-l-nitroso-3,5-dinitro-s-triazine ONDNTA, 1,3,5-trinitro-1,3,5-triazacycloheptane TNCHP, and 2-oxo- 1,3,5-trinitro- 1,3, 5-triazacyclohexane K6. The thermal decomposition processes were studied using simultaneous thermogravimetric modulated beam mass spectrometry STMBMS to identify the decomposition products and to determine their gas formation rates and using mixtures of isotopically labeled analogues of the compounds to track the decomposition mechanisms by analyzing the extent of isotopic scrambling and the deuterium kinetic isotope effect DKIE. Extensive results on the thermal decomposition of RDX and HMX in the solid and liquid phases show that their decomposition is controlled by several parallel decomposition pathways. One pathway involves the loss of HONO and the formation of oxy-s-triazine OST from the RDX ring. The other pathway occurs via the mononitroso intermediate of the parent compound. The decomposition of the mononitroso-RDX intermediate, ONDNTA, has been extensively studied and a summary of the highlights of its decomposition is presented. The results on TNCHP show that it is the only one of the cyclic nitramines studied that is stable in the liquid phase. Thermal decomposition, Thermal stability, Mass spectrometry, Isotopic labels, Deuterium kinetic isotope effect, DKIE, Nitramines, Nitroso compounds, Cyclic nitramines, RMX, RDX, K6, TNCHP, ONDNTA, Kinetics, Reaction mechanisms, Reaction rates, Sensitivity, Explosives, Propellants, Energetic materials.

Subject Categories:

  • Physical Chemistry
  • Ammunition and Explosives
  • Atomic and Molecular Physics and Spectroscopy
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE