Thermal decomposition study of perchlorate-based metal-free molecular perovskite DAP-4 mixed with ammonium perchlorate. (June 2022)

• Record Type: Journal Article
• Authors: Feng, Xiao-Jun; Zhang, Kun; Shang, Yu; Pan, Wen
• Is Part Of: Case studies in thermal engineering. Volume 34(2022)
• Publication Date: 2022-06
• Subjects: Perchlorate-based molecular perovskite -- Negative oxygen balance -- Gaseous products -- Condensed phase -- Thermal decomposition mechanism; Heat engineering -- Case studies -- Periodicals; 621.40205
• DOI: 10.1016/j.csite.2022.102013
• Languages: English
• ISSNs: 2214-157X

Abstract

Abstract: The molecular perovskite energetic materials (H2 dabco)[NH4 (ClO4 )3 ] (DAP-4, H2 dabco 2+ = 1, 4-diazabicyclo[2.2.2]octane-1, 4-diium), limits its separate application in explosives duo to the severe negative oxygen balance. Therefore, it is of great significance to study the thermal decomposition performance of DAP-4 in the presence of AP oxidant. In this work, the differential scanning calorimetry-thermogravimetry-mass spectrometry-fourier transform infrared spectroscopy (DSC-TG-MS-FTIR) coupling technique, thermal decomposition kinetics, and in-situ FTIR method were used to analyze the thermal decomposition characteristics, and the variation of condensed phase characteristic groups of DAP-4 and the DAP-4/AP mixtures. The results show that AP has negligible effect on thermal decomposition temperature of DAP-4 but can prolong the total decomposition time of DAP-4 by 5.55 min. In addition, thermal decomposition of AP and DAP-4 in the mixture is independent of each other, and the thermal decomposition mechanism of DAP-4/AP mixtures is more complicated than that of DAP-4 alone. Thermal decomposition of DAP-4/AP mixture firstly experiences decomposition of AP at low temperature, the inside crystal transformation of DAP-4, the H + transfer, and then cage skeleton collapse-induced redox reaction to generate large amount of heat which can shift forward the high-temperature decomposition peak of AP.