Pressure-Modulated Dissolution Behavior of LLM-105 Crystals in High-Temperature Water

The exploration of the microstructural evolution andreaction kineticsof energetic materials with high-temperature and high-pressure watercontributes to the understanding of their microscopic physicochemicalorigin, which can provide critical experimental data for the use ofenergetic materials. As a promising high-energy and insensitive energeticmaterial, LLM-105 has been investigated under extreme conditions suchas high pressure and high temperature. However, little informationis available about the effect of water on LLM-105 under high pressureand high temperature. In this work, the interaction between LLM-105and water under HP-HT was investigated in detail. As a result, thedissolving behavior of LLM-105 in water under high pressure and hightemperature is related to the initial pressure. When the initial pressureis less than 1 GPa, LLM-105 crystals are dissolved in high-temperaturewater; when the initial pressure is above 1 GPa, LLM-105 particlesare only decomposed in high-temperature water. When the solution issaturated at a high temperature, recrystallization of the LLM-105sample appears in the solution. High pressure hindered the dissolutionprocess of the sample in HP-HT water because the interaction betweenthe solute and the solvent was weakened by high pressure. The initialpressure is one of the significant parameters that determines whetherLLM-105 crystals can be dissolved in high-temperature water. Moreimportantly, water under high pressure and high temperature can notonly act as a solvent when dissolving the samples but also act asa catalyst to accelerate the decomposition process. In addition, theHP-HT water reduced the decomposition temperature of the LLM-105 crystalto a large extent. The research in this paper not only provides insightsinto the interaction between LLM-105 and water but also contributesto the performance of energetic materials under extreme conditionsand their practical applications in complex conditions.