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| Therm Decomposition Mechanism of Modified Double-base Propellant in Methyl-violet Test |
| Received:November 18, 2023 Revised:January 06, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.02.005 |
| KeyWord:methyl-violet test modified double-base propellant stability therm decomposition microcalorimetry reaction depth |
| Author | Institution |
| LI Jiajia |
Shanxi North Xing'an Chemical Industry Co., Ltd., Taiyuan , China |
| ZHOU Jing |
Xi'an Modern Chemistry Research Institute, Xi'an , China |
| ZHANG Xingbin |
Shanxi North Xing'an Chemical Industry Co., Ltd., Taiyuan , China |
| LIAN Jianbiao |
Shanxi North Xing'an Chemical Industry Co., Ltd., Taiyuan , China |
| DING Li |
Xi'an Modern Chemistry Research Institute, Xi'an , China |
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| Abstract: |
| The work aims to study the thermal decomposition mechanism of two typical modified double-base propellants, respectively containing Al and RDX in the methyl-violet test. A comparative experiment was conducted to double-base propellants with TG-DSC-FTIR-MS combined technology. By analyzing characteristic parameters such as decomposition temperature, heat release, and decomposition products, the non isothermal decomposition behavior of the three propellants was identified. The isothermal decomposition behavior of three propellants was studied by microcalorimetry at the same temperature as the methyl-violet test. The thermal weight loss and thermal decomposition behavior of Al modified double-base propellants under programmed heating conditions were basically consistent with those of double-base propellants. NG in RDX modified double-base propellants was more volatile than that in the other two propellants, and the corresponding decomposition reaction released less NO2 during the initial stage of NG decomposition. The entire thermal decomposition reaction process was divided into two stages, where the NC/NG system containing nitrate groups firstly decomposed and then caused the thermal decomposition of ammonium nitrate explosive RDX. Under isothermal conditions, the reaction depth of the three propellants at 40 min did not exceed 0.4%, and the reaction depth at 5 h did not exceed 3% of the reaction depth, but the decomposition reaction rate of Al modified double-base propellants was faster in the early stage of the decomposition reaction. Through comparison between the stability test results of different propellants, it is found that the longer complete color change time of the methyl violet test paper does not mean the better thermal stability, indicating that the methyl-violet stability test method has certain limitations. The use of decomposition reaction depth as the link between measuring gas and calorimetry methods is expected to achieve quantitative evaluation of stability with microcalorimetry as an alternative technique for methyl-violet test. |
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