Alkali Metals, Alkaline Earth Metals With 3 - Amino - 5 - Carboxy-1, 2,4 - Triazole Complexes Of The Synthesis, Characterization And Catalytic Combustion Performance

Based on characteristic of triazole compounds in energy and stabilization, herein we synthesized seven complexs with 3-Amion-lH-1,2,4-triazole-5-carboxylic acid hemihyydrate (H2atc) as ligand and alkali metals (Li, Na, K) and alkaline earth metals (Mg, Ca, Sr, Ba). The complexes were characterized by element analysis, infrared analysis, X-ray powder diffraction analysis and TG-DSC techniques.Because of small charge and large size of alkali metal and alkaline earth metal, the ability to form complex is far less than transition metal. This paper synthesized [Li2(C3N4O2H2)·H2O], [Na(C3N4O2H3)·H2O], [K(C3N4O2H3)·H2O], [Mg(C3N4O2H2)·H2O], [Ca(C3N4O2H3)2·H2O], [Sr(C3N4O2H2)·2H2O], [Ba(C3N4O2H2)·2H2O] complexes. The experimental results showed that the complexes of alkaline earth metal adoptedμ3-N1, N2, N4-bridged coordination mode, and carboxyl oxygen was involved in the coordination in the complexes of alkaline metal. TG-DSC showed that the seven complexes had a higher thermal stability.The complexes and their propellant(AP, HMX, RDX, and NC/NG) mixtures (binary component system:1/3) were characterized by DSC technology at the four main heating rates (β= 5℃/min,10℃/min,15℃/min,20℃/min). This paper compared the parameters of thermal decomposition characteristics of mixed systems with those of the propellant components alone, and found the thermal decomposition temperatures of the propellants were decreased. The thermal decomposition behavior of the complexes on AP was the largest and significant. In the complexes, the thermal decomposition temperature of potassium complexes was the lowest, and its energy contribution was larger. Based on the law of lower exothermic peak temperature leading to improvement of the burning rate, the addition of the seven complexes on increasing the burning rate is beneficial. The results indicated that these complexes may be potentially empolyed as energetic modifier in solid propellants.