Application of a multi-channel in-situ infrared spectroscopy: The case of LLM-105.

Abstract

The thermal decomposition process of 2,6-diamino-3,5-dinitropyrazine-1-oxide(LLM-105)under several constant temperatures (100°C, 115°C, 130°C, and 145°C) have been studied by a multi-channel in-situ reaction system. Almost 1000 spectra were obtained within 24days by Fourier-transform infrared spectroscopy (FT-IR). The thermal decomposition activation energies (Eα) of C-NH2 and C-NO2 in LLM-105 were calculated by the Arrhenius equation to be 89.65 and 145.09kJmol-1, respectively. The thermal decomposition process of LLM-105 under long-term constant temperature is divided into two paths: intramolecular H-transfer and C-NO2 partition. It is feasible to study the aging process of materials using a combination of a multi-channel in-situ reaction system and FT-IR, which can effectively monitor the evolution of structure.