Thermal stability study of nitro-rich triazole derivatives using temperature dependent time resolved pulsed photoacoustic (PA) technique

The paper reports the pulsed laser based photoacoustic pyrolysis technique to study the thermal stability of novel nitro-rich 1H-1,2,3-triazole derivatives of high energy materials (HEMs) for the first time. We have employed 532 nm wavelength, 7 ns duration pulses at 10 Hz repetition rate obtained from Q-switched Nd:YAG laser system to record the time resolved temperature dependent PA spectra in a specially designed PA pyrolysis system. The study has been carried out between the 30 and 350 °C temperature range. Thermally stable HEMs are insensitive to temperature and they release very small amount of volatile compounds such as H2O, NO2, and NO at high temperatures. The combined results obtained from PA and TG–DTA techniques open a new channel to understand the molecular dynamics of HEMs which is responsible for energy storage mechanism of these compounds in terms of free NO2 at different temperature ranges. In addition, the experimental findings lead to develop a new tool to scale the efficiency of these molecules as a fuel.