| As we all know,China recently has advanced its technology related to composite solid propellants,and successfully sent rockets into space by the application of solid propellants instead of the usual choice of liquid propellants.The application of solid propellants can reduce the preparation time of a shooting mission greatly.AP,ammonium perchlorate,is a widely used oxidizer in composite solid propellants,and the continuous focus on the development of new combustion catalysts of AP is crucial for the development of composite solid propellants to reach better performance during their application.In this study,furazan derivatives are chosen as ligands to coordinate with different metal ions to synthesize coordination compounds,and then their effects on AP thermal decomposition are tested,respectively.The major content in this research can be concluded as follows:（1）Five different furazan-based ligands,including 4-methylfurazan-3-carboxylic acid（MOCA）,4-aminofurazan-3-carboxylic acid（AFCA）,methylene-bis（4-aminofurazan-3-carboxylic acid）,3-amino-4-methylfurazan,and methylene-bis（3-amino-4-methylfurazan）,have been synthesized.Their structures have been confirmed by their 1H NMR`s,13C NMR`s and infrared spectroscopy`s experimental data.（2）two ligands,including 4-methylfurazan-3-carboxylic acid（MOCA）and 4-aminofurazan-3-carboxylic acid（AFCA）,was chosen to coordinate with several different kinds of metal ions,and their single crystals were also grown by slow solvent evaporation at room temperature.With the coordination between 4-methylfurazan-3-carboxylic acid and two different metal ions,including Cu2+and Pb2+,two new complexes,[Cu（MOCA）2（H2O）4]and[Pb2（MOCA）4]n,were obtained.With the coordination between 4-aminofurazan-3-carboxlic acid and five different metal ions,including Sr2+,Cd2+,Mn2+,Zn2+and Pb2+,five new complexes,including{[Sr（AFCA）2（H2O）2]·2H2O}n,[Cd（AFCA）（CH3COO）（H2O）2]n,[Mn（AFCA）2（H2O）4]·2H2O,[Zn（AFCA）2（H2O）4]·2H2O and[Pb（AFCA）2（H2O）2]n,were obtained.All seven crystals were obtained with their single-crystal structures by X-ray single crystal diffraction.（3）The seven obtained complexes and AP were mixed with different mass ratios,respectively,and then DTA was used to proceed the thermal performance tests for those obtained mixtures to find out the catalytic effects of those seven complexes to AP thermal decomposition.Their apparent activation energies were calculated by the Kissinger method and Ozawa–Doyle method,respectively,with decomposition peak temperatures from different heating rates.Those six complexes,including[Cu（MOCA）2（H2O）4],[Pb2（MOCA）4]n,[Cd（AFCA）（CH3COO）（H2O）2]n,[Mn（AFCA）2（H2O）4]·2H2O,[Zn（AFCA）2（H2O）4]·2H2O and[Pb（AFCA）2（H2O）2]n,are positive combustion catalysts of AP,which can make AP`s HTD appear earlier.{[Sr（AFCA）2（H2O）2]·2H2O}n can significantly decreased the timing of AP`s LTD appearance,which means that the complex is an negative combustion catalyst of AP,and can inhibit AP`s combustion. |
PDF Full Text Request