Thermal decomposition of energetic materials. 55. Metal Complexes of Diamioglyoxime as Potential Burn Rate Modifiers in composite propellants

Abstract

Metal complexes having the potential to modify the burn rate of rocket propellants are described. These are the diaminoglyoxime (DAG) complexes: Co(DAG–H)2·DAG, Cu(DAG–H)2·DAG, Ni(DAG–H)2 and Pd(DAG–H)2. The thermal decomposition was characterized by DSC, TGA and IR spectroscopy at a heating rate of 5°C/min, and by fast thermolysis/FTIR spectroscopy at 100–250°C/s. The M(DAG–H)2 complexes are more thermally stable than M(DAG–H)2·DAG. However, all of the compounds produce highly thermally stable residues which would be expected to retard the heat and mass transfer at a burning surface. The residues most closely resemble coordination complexes of the metal and polymeric cyclic azine compounds. The crystal and molecular structure of the previously unreported complex Ni(DAG–H)2·HCL is described.

Studies on diaminoglyoxime (DAG): Thermolysis and evaluation as ballistic modifier in double base propellant

“…The interaction between NO and OH groups in DAG [9,22] is believed to contribute to its higher thermal stability [23,24]. However, preferential loss of IR band intensity corresponding to the N O bond suggests that cleavage of C NO is a primary step in the thermal decomposition of DAG (Fig.…”

Preparation, crystal structure and thermal studies of cadmium perchlorate complex with 2,2′-bipyridine

“…As for sensitivity parameters are concern, this type of complexes lies between primary and secondary explosives [4]. These complexes find applications in propellants [5][6][7][8][9][10], explosives and pyrotechnics [11,12]. These complexes yield corresponding ultrafine oxide as end product of thermolysis, which may find applications in inorganic electronic films [13], gas sensors, photocatalysis, self-cleaning [14], anodic materials for lithium-ion battery [15] and in composite solid propellants to increase their burn rate [16,17].…”

Precise Regulation of Combustion Characteristics of High-Energy Composite Propellants by Incorporation of CL-20 Crystals Intercalated with Energetic Burn Rate Modifiers

“…In the past decade, research work has been conducted extensively on the preparation of energetic burn rate inhibitors aiming to circumvent the issue of energy degradation, and the material design is typically guided under the concept of combining the energetic functional groups with the one capable of reducing the burn rate of propellants. 16 The energetic functional groups that have been widely investigated include tetrazine, tetrazole, and the derivatives of furazan; and the ions or groups that display the capability to suppress the burn rate of propellants are known for quaternary ammonium salts, guanidine ions, and hydrazine group. The guanidine compounds are considered as a promising energetic burn rate inhibitor, which contains a hydrogen atom with high reactivity.…”