Accession Number : ADA191612

Title :   Kinetic Measurements of Thermal Decomposition of Energetic Materials at High Pressures.

Descriptive Note : Final rept. 17 Oct 84-16 Oct 87,

Corporate Author : NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD INST FOR MATERIALS SCIENCE AND E NGINEERING

Personal Author(s) : Piermarini, Gasper J ; Block, Stanley

PDF Url : ADA191612

Report Date : 12 Jan 1988

Pagination or Media Count : 4

Abstract : A new spectroscopic method was developed which permits kinetic measurements of reactions in energetic materials at high pressures. The method utilizes FTIR in conjunction with a diamond anvil high pressure cell. Measurements were made on HMX and nitromethane. The rate of thermal decomposition for HMX was found to have a negative pressure dependence, which, when coupled with the observed thermodynamic activation quantities, led to a unimolecular decomposition mechanism - ring expansion prior to bond scission. Contrary to the HMX case, the decomposition rate for nitromethane was observed to have a positive pressure dependence leading to a bimolecular reaction mechanism which is the result of increased intermolecular interactions. A dynamic stress-induced catastrophic reaction was observed in protonated nitromethane at room temperature, but not in the deuterated form. Keywords: Thermal decomposition, Kinetics, Pressure, Reaction mechanism, Chemical stability, HMX, Nitromethane.

Descriptors :   *HMX, *NITROMETHANE, *REACTION KINETICS, *EXPLOSIONS, ACTIVATION, DECOMPOSITION, ENERGETIC PROPERTIES, INTERACTIONS, KINETICS, MOLECULE MOLECULE INTERACTIONS, PYROLYSIS, SPECTROSCOPY, THERMODYNAMIC PROPERTIES, VIBRATIONAL SPECTRA, CATASTROPHIC CONDITIONS

Subject Categories : Ammunition and Explosives
      Explosions
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE