Physical Characterization of RX-55-AE-5A Formulation of 97.5 2,6-Diamino-3,5-Dinitropyrazine-1-Oxide (LLM-105) and 2.5Viton A

摘要

With the use of modern tools such as molecular modeling on increasingly powerfulcomputers, new materials can be evaluated by their structural activity relationships, SAR, andtheir approximate physical and chemical properties can be calculated in some cases withsurprising accuracy. These new capabilities enable streamlined synthetic routes based on safety,performance and processing requirements, to name a few [1]. Current work includes bothunderstanding properties of old explosives and measuring properties of new ones. The necessityto know and understand the properties of energetic materials is driven by the need to improveperformance and enhance stability to various stimuli, such as thermal, friction and impact insult.This review will concentrate on the physical properties of RX-55-AE-5, which is formulatedfrom heterocyclic explosive, 2,6-diamino-3,5-dinitropyrazine-1-oxide, LLM-105, and 2.5 %Viton A. Differential scanning calorimetry, DSC, was used to measure a specific heat capacity,Cp, of ≈ 0.950 J/g·°C, and a thermal conductivity, κ, of ≈ 0.160 W/m·°C. The LawrenceLivermore National Laboratory (LLNL) code Kinetics05 and the Advanced Kinetics andTechnology Solutions (AKTS) code Thermokinetics were both used to calculate Arrheniuskinetics for decomposition of LLM-105. Both obtained an activation energy barrier E ≈ 180 kJmol-1 for mass loss in an open pan. Thermal mechanical analysis, TMA, was used to measure thecoefficient of thermal expansion, CTE. The CTE for this formulation was calculated to be ≈ 61μm/m·°C. Impact, spark, friction and evolved gases are also reported.