Comparative analysis of sublimation and thermal decomposition of TATB

Comparative analysis of sublimation and thermal decomposition of TATB

This experimental study investigated the effects of confinement, starting mass, and heating rate on TATB thermal decomposition and sublimation using a combined Thermo‐Gravimetric Analyzer and Differential Scanning Calorimetry (TGA/DSC) instrument. The confinement of volatile products was varied usin...

Full description

Saved in:
Bibliographic Details
Published in:Propellants, explosives, pyrotechnics Vol. 49; no. 2
Main Authors: Koroglu, Batikan, Burnham, Alan K., Mashiana, Imren, Racoveanu, Ana, Arose, Christopher, Crowhurst, Jonathan C., Reynolds, John G.
Format: Journal Article
Language:English
Published: Weinheim Wiley Subscription Services, Inc 01-02-2024
Wiley
Subjects:
Analog computers
Carbonaceous materials
Confinement
Decomposition
Differential scanning calorimetry
diffusion
DSC
Enthalpy
Gaseous diffusion
Heat of sublimation
Heat transmission
Heating rate
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Pinholes
Process variables
Sublimation
TATB
TGA
Thermal decomposition
thermal decomposition kinetics
Weight loss
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This experimental study investigated the effects of confinement, starting mass, and heating rate on TATB thermal decomposition and sublimation using a combined Thermo‐Gravimetric Analyzer and Differential Scanning Calorimetry (TGA/DSC) instrument. The confinement of volatile products was varied using different pinhole sizes with TGA/DSC pans. The measurements showed the open pan experiments without lids/pinholes resulted in complete sublimation of TATB between 320 °C and 360 °C. The heat of sublimation was determined to be 176 kJ/mol (42 kcal /mol), consistent with literature data obtained from other experimental techniques. The use of pinholes suppressed the sublimation of TATB such that the decrease in pinhole size resulted in 1) an increase in the enthalpy of reaction and an increase in the amount of carbonaceous material remaining at the end of decomposition, and 2) convergence of the two peak temperatures corresponding to maximum heat flow and maximum weight loss. Also, a transition from a two‐exotherm thermal decomposition behavior towards a single‐exotherm occurred as the pinhole size was decreased for a given starting mass or as the starting mass was increased for a given pinhole size. These results indicate the kinetics of TATB sublimation, TATB thermal decomposition, and gas diffusion out of a TGA/DSC pan can all compete and result in significantly different enthalpies, amounts of remaining materials, and peak temperatures depending on the pinhole size and starting mass used in the measurements. The results also indicate precise control of process variables (pinhole size, starting mass, and heating rate) in TGA/DSC measurements is required for thermal safety assessment of explosives.
Bibliography:Correction added on 28.8.2023: Corrections in Table 1 and Affiliation
AC52-07NA27344
LLNL-JRNL-848862
USDOE National Nuclear Security Administration (NNSA)
ISSN:0721-3115
1521-4087
DOI:10.1002/prep.202300124