Thermal and combustion behavior of novel oxygen-rich energetic pyrazoles

Physicochemical properties, such as thermal decomposition, burning behavior, and flame structure of low-melting oxygen-rich energetic N -trinitromethyl-3,4-dinitropyrazole ( 1 ), N -trinitromethyl-3,5-dinitropyrazole ( 2 ), N -flurodinitromethyl-3,5-dinitropyrazole ( 3 ), and N -[(difluoroamino)dini...

Full description

Saved in:
Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2018-04, Vol.132 (1), p.127-142
Main Authors: Serushkin, Valery V., Sinditskii, Valery P., Hoang, Trung H., Filatov, Sergey A., Shipulina, Anna S., Dalinger, Igor L., Shakhnes, Aleksander Kh, Sheremetev, Aleksey B.
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Burning rate
Chemistry
Chemistry and Materials Science
Combustion
Decomposition
Decomposition reactions
Flame structure
Fluorine
Heterocyclic compounds
Inorganic Chemistry
Measurement Science and Instrumentation
Nitrogen dioxide
Physical Chemistry
Polymer Sciences
Rate constants
Resveratrol
Thermal decomposition
Thermal stability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Physicochemical properties, such as thermal decomposition, burning behavior, and flame structure of low-melting oxygen-rich energetic N -trinitromethyl-3,4-dinitropyrazole ( 1 ), N -trinitromethyl-3,5-dinitropyrazole ( 2 ), N -flurodinitromethyl-3,5-dinitropyrazole ( 3 ), and N -[(difluoroamino)dinitromethyl]-3,5-dinitropyrazole ( 4 ), have been studied. It has been found that the stability of N -trinitromethyl azoles is relatively higher than stability of similar C-trinitromethyl heterocycles. Replacing one nitro group in the trinitromethyl moiety with fluorine or difluoroamine group changes the C–NO 2 bond length and the thermal stability. However, there is no linear correlation between the rate constants and the C–NO 2 bond length, which indicates the presence of other factors affecting the stability of trinitro- and substituted dinitromethyl derivatives. The burning rates of the nitropyrazoles varied from 26.8 mm s −1 (for 1 ) to 77.5 mm s −1 (for 4 ) at 10 MPa. An analysis of thermocouple data shows that the burning rate of nitropyrazoles 1 , 2 , and 4 depends on the rate of heat release in the condensed phase. The increased stability of the fluorodinitromethyl compound 3 causes a decrease in the depth of its decomposition in the melt and shifts the leading reaction of its combustion into the gas phase. Graphical Abstract Two-stage decomposition is stipulated by different thermal stabilities of the substituent and the dinitropyrazole fragment
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-017-6911-2