Thermal Decomposition Mechanism of DAP⁃4/TKX⁃50 Mixtures

被引：0

作者：

Zhang K. ^{[1
]}

Feng B. ^{[1
]}

Wang X.-F. ^{[1
]}

Shang Y. ^{[1
]}

Xi P. ^{[1
]}

Pan W. ^{[1
]}

Feng X.-J. ^{[1
]}

机构：

[1] Xi′an Modern Chemistry Research Institute, Xi′an

来源：

Hanneng Cailiao/Chinese Journal of Energetic Materials | 2022年 / 30卷 / 07期

关键词：

DAP4/TKX50; mixtures; DSCTG/MS/FTIR; gas products; thermal decomposition mechanism;

D O I：

10.11943/CJEM2022064

中图分类号：

学科分类号：

摘要：

To explore the detailed thermal decomposition properties of the mixture system consists of ammonium perchloratebased molecular perovskite energetic material（H2dabco）（NH4）（ClO4）3（DAP4，where H2dabco2+ refers to 1，4diazabicyclo［2.2.2］octane1，4dianiumion）and dihydroxylammonium 5，5′bistetrazole1，1′diolate（TKX50），the thermal decomposition characteristics and gas products of DAP4 and DAP4/TKX50 mixtures were comparatively analyzed by using differential scanning calorimetrythermogravimetry/mass spectrometry/fourier infrared spectroscopy；meanwhile，the changes of characteristic groups in the condensed phase of DAP4 and DAP4/TKX50 mixtures with temperature were investigated by in⁃situ FTIR. Based on the explorations the thermal decomposition mechanism of DAP4/TKX50 mixture was proposed. The results showed that after mixing DAP4 with TKX50，DAP4 had little effect on the thermal decomposition of TKX50，while the heat generated by the thermal decomposition of TKX50 made the reversible phase transition endothermic peak of DAP4 disappeared，but hardly affected DAP4′s thermal decomposition at high temperature. The thermal mass loss of DAP4/TKX50 mixture was divided into two stages. The mass loss of the first stage was 43.4% and the mass loss of the second stage was 52.4%，leaving 4.2% of the decomposition residue. The main gas products produced by thermal decomposition of DAP4 and DAP4/ TKX50 mixture were NH3/H2O/HNCO/HCN/CO/HCl/CO2 and H2O/NO/N2O/HCl/NH3/N2/HNCO/HCN/CO/CO2，respectively. The thermal decomposition mechanism of the DAP4/TKX50 mixture was proposed as follows：the reversible transfer of hydrogen ions occurs first in the molecule of TKX50 to generate hydroxylamine and 1，1′dihydroxy5，5′bitetrazole（BTO），then hydroxylamine decomposed into small molecular gases at high temperature while the fragments generated by BTO decomposition partially polymerized into coupling products. Finally，the ionic bond of DAP4 was broken，leading to instantaneous collapse of the cagelike skeleton. The strongly reducing and strongly oxidizing gas components underwent violent redox reactions at high temperatures and release a large amount of heat. © 2022 Institute of Chemical Materials, China Academy of Engineering Physics. All rights reserved.

引用

页码：673 / 680

页数：7

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