Investigations on Chemical, Thermal Decomposition Behavior, Kinetics, Reaction Mechanism and Thermodynamic Properties of Aged TATB

Abstract

1,3,5-triamino-2,4,6-trinitrobenzene (TATB) is a kind of insensitive high explosive that can be used as an energetic material in nuclear weapon and space applications. In this work, we have studied the effect of aging on the properties of TATB from a 20 year old lot that had been in direct contact with casing and natural environment conditions. The kinetics was studied using the temperature at the maximum reaction rate (peak) and isoconversional methods from TGA and DTA data obtained at five heating rates under a nitrogen atmosphere. The properties investigated for thermal stability indicate that there is no change in the properties during prolonged exposure in natural environment conditions. The activation energy calculated by the Kissinger method was 179.9 kJ·mol −1 by DTG and the 176.9 kJ·mol −1 by DTA. The experimental results of kinetic analysis obtained by isoconversional methods are in good agreement and very close to each other. In the analysis of reaction mechanisms, the reaction models could be probably best described by a surface contraction mechanism using the Coats-Redfern and Criado methods. The thermodynamic parameters such as Gibbs free energy, enthalpy and entropy of activation were also investigated. The self-accelerating decomposition temperature (TSADT) and critical temperature for thermal explosion (Tb) were also calculated.

One Step Closer to an Ideal Insensitive Energetic Molecule: 3,5-Diamino-6-hydroxy-2-oxide-4-nitropyrimidone and its Derivatives

“… a Decomposition temperature (onset). b Experimental density at room temperature. c Enthalpy of formation (kJ mol –1 ). d Detonation velocity (m s –1 ). e Detonation pressure (GPa). f Impact sensitivity (J). g Friction sensitivity (N). h Oxygen balance calculated using OB = (O-2C-1 – 2H)­1600/M}. i Refs and . j Refs and . k Refs , , and . …”

Kinetic Analysis of the Thermal Decomposition of Polymer‐Bonded Explosive Based on PETN: Model‐Fitting Method and Isoconversional Method

“…According to equation ( 2), the corresponding curve of the conversion φ versus temperature T was obtained and is Table 2: Different reaction models generally applied to describe the thermal decomposition in solids [21,22,24,25].…”

Thermal Degradation Behavior and Kinetics of aged TNT-based Melt Cast Composition B

“…It indicates that the system is brought to a state close to its own thermodynamic equilibrium with low reactivity. On other hand, a high value of the entropy of activation means that the system is brought to a state far from its own thermodynamic equilibrium with high reactivity [39,40].…”