Synthesis and Properties of Energetic Ionic salts Based on 3, 6-Bis(1 H -1, 2, 3, 4-tetrazol-5-yl-amino)- s -tetrazine(BTATz)

Three kinds of energetic ionic salts, dimethylaminium salt (DMAB), 1, 3-propanediaminium salt (PDAB) and 1, 4-butanediaminium salt (BDAB) of 3, 6-bis(1 H -1, 2, 3, 4-tetrazol-5-yl-amino)- s -tetrazine(BTATz) were synthesized. The structures of DMAB, PDAB and BDAB were characterized by IR, 1 H NMR, 13 C NMR and elemental analyses. The crystal structure of PDAB was determined by X-ray single crystal diffraction. The detonation velocity ( D ) and detonation pressure ( p ) of PDAB were calculated. The thermal decomposition behaviors of DMAB, PDAB and BDAB were studied by DSC and TG-DTG. The self-accelerating decomposition temperature ( T SADT ), the critical temperature of thermal explosion ( T b ), the thermal ignition temperature ( T TIT ) and adiabatic time-to-explosion ( t TIAD ) were calculated. Results show that the crystal of PDAB is monoclinic, space group C 2/c with crystal parameters of a =2.2699(10) nm, b =0.5098(2) nm, c =1.6449(6) nm, β =93.045(15)°, V =1.9008(13) nm 3 , D c =1.504 g·cm -3 , Z =4, F (000)=912, μ =0.127 mm -1 , R 1 =0.0673 and wR 2 =0.2002. The values of D and p of PDAB are 8862.09 m· s -1 and 32.15 GPa, respectively. The values of T SADT of DMAB、PDAB and BDAB are 576.87 K, 511.90 K and 521.55 K, respectively, revealing that DMAB has higher thermal stability than PDAB and BDAB. DMAB, PDAB and BDAB can be used as potential energetic materials and the property of DMAB is better than that of PDAB and BDAB.