78350-50-2Relevant articles and documents
An efficient strontium-based combustion inhibitor of ammonium perchlorate with a 2D-MOF structure
Huang, Yao,Peng, Rufang,Jin, Bo
, p. 11068 - 11074 (2021/07/06)
In this study, a new strontium 2D-MOF, {[Sr(AFCA)2(H2O)2]·2H2O}n(AFCA = 4-aminofurazan-3-carboxylic acid), was successfully prepared by slow evaporation at room temperature. Its structure was characterized by X-ray single-crystal diffractometry. DTA as an efficient thermal analysis method was used in this study to have a better understanding of the thermal decomposition of ammonium perchlorate (AP). The Kissinger and the Ozawa-Doyle methods were also applied to determine the apparent activation energy (E) and the pre-exponential factor (A) of AP thermal decomposition. After the addition of {[Sr(AFCA)2(H2O)2]·2H2O}nin AP, there is an increase of 85.97 °C in the LTD stage of AP thermal decomposition and an insignificant decrease of 24.32 °C in the HTD stage. With the help of the TG-DSC-DTG method, we analyse the catalytic mechanism of AP in the LTD stage in detail. {[Sr(AFCA)2(H2O)2]·2H2O}ncan act as an efficient combustion inhibitor for AP thermal decomposition.
1,3,4-Oxadiazole Bridges: A Strategy to Improve Energetics at the Molecular Level
Ma, Jinchao,Chinnam, Ajay Kumar,Cheng, Guangbin,Yang, Hongwei,Zhang, Jiaheng,Shreeve, Jean'ne M.
, p. 5497 - 5504 (2021/01/26)
Many energetic materials synthesized to date have limited applications because of low thermal and/or mechanical stability. This limitation can be overcome by introducing structural modifications such as a bridging group. In this study, a series of 1,3,4-oxadiazole-bridged furazans was prepared. Their structures were confirmed by 1H and 13C NMR, infrared, elemental, and X-ray crystallographic analyses. The thermal stability, friction sensitivity, impact sensitivity, detonation velocity, and detonation pressure were evaluated. The hydroxylammonium salt 8 has an excellent detonation performance (D=9101 m s?1, P=37.9 GPa) and insensitive properties (IS=17.4 J, FS=330 N), which show its great potential as a high-performance insensitive explosive. Using quantum computation and crystal structure analysis, the effect of the introduction of the 1,3,4-oxadiazole moiety on molecular reactivity and the difference between the sensitivities and thermal stabilities of mono- and bis-1,3,4-oxadiazole bridges are considered. The synthetic method for introducing 1,3,4-oxadiazole and the systematic study of 1,3,4-oxadiazole-bridged compounds provide a theoretical basis for future energetics design.
Azo1,3,4-oxadiazole as a Novel Building Block to Design High-Performance Energetic Materials
Wang, Qian,Shao, Yanli,Lu, Ming
, p. 839 - 844 (2019/01/25)
In this study, the azo1,3,4-oxadiazole energetic fragment was first introduced into the energetic materials using a simple synthetic strategy, yielding two symmetrical covalent compounds 4 and 5. All new compounds (3-5) were well-characterized by IR spectroscopy, NMR spectroscopy, thermal analysis, and single-crystal X-ray diffraction analysis. As supported by differenctial scanning calorimetry data, compounds 4 and 5 possess excellent decomposition temperatures as high as 248 and 278 °C, respectively. To the best of our knowledge, 278 °C ranks highest in all 1,3,4-oxadiazole-based energetic compounds. Their energetic performances were evaluated with EXPLO5. Both 4 and 5 show good detonation velocities (D) of 8409 and 8800 m s-1 and detonation pressures (P) of 29.3 and 35.1 GPa, comparable to RDX (D: 8795 m s-1, P: 34.9 GPa). Furthermore, on the basis of the single-crystal data, quantum-chemical calculations were employed to better understand their intrinsic structure-property relationship. All these positive results indicate the superior potential of the azo1,3,4-oxadiazole backbone for designing next generation of energetic materials.
