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Gas Releasing Mechanism of LLM‐105 Using Two‐Dimensional Correlation Infrared Spectroscopy
Author(s) -
Xiao Qian,
Sui Heliang,
Yu Qian,
Chen Jie,
Yin Ying,
Ju Xin
Publication year - 2019
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.201900034
Subject(s) - infrared spectroscopy , decomposition , chemistry , thermal decomposition , spectroscopy , nitrogen , infrared , analytical chemistry (journal) , explosive material , organic chemistry , physics , quantum mechanics , optics
In this paper, a sealed in‐situ reaction system and infrared spectroscopy (IR) were used to study the gas releasing mechanism of 2,6‐diamino‐3,5‐dinitropyrazine‐1‐oxide (LLM‐105) at different temperatures. Three characteristic stages of LLM‐105 during the heating process to 400 °C were detected by the moving‐window two‐dimensional correlation spectroscopy (MW2D). Two‐dimensional correlation infrared spectroscopy (2DCOS) was employed to examine changes of gas concentration in the sealed system at each stage. We found that in the first stage, LLM‐105 first released H 2 O and NH 3 . In the second stage, the decomposition is intensified, the explosive molecule first undergoes the decomposition reaction of releasing H 2 O, and CO 2 , subsequently chemical reaction producing several nitrogen gases, such as NO, N 2 O, HCN, NO 2 and NH 3 . In the third stage, the decomposition process mainly releases CO 2 and NH 3 , and the concentrations of HCN and NO 2 decreased gradually. 2DCOS proven to be a very sensitive method for detecting thermal decomposition mechanisms and monitoring gas changes in sealed system.