Synthesis and thermal behavior of 4,5-dihydroxyl-2-(dinitromethylene)-imidazolidine (DDNI) |
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| Authors: | Kang-Zhen Xu Yong-Shun Chen Min Wang Jin-An Luo Ji-Rong Song Feng-Qi Zhao Rong-Zu Hu |
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| Institution: | (1) Department of Chemical Engineering/Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi’an, 710069, People’s Republic of China;(2) Conservation Technology Department, The Palace Museum, Beijing, 100009, People’s Republic of China;(3) Xi’an Modern Chemistry Research Institute, Xi’an, 710065, People’s Republic of China |
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| Abstract: | A novel energetic material, 4,5-dihydroxyl-2-(dinitromethylene)-imidazolidine (DDNI), was synthesized by the reaction of FOX-7
and glyoxal in water at 70 °C. Thermal behavior of DDNI was studied with DSC and TG-DTG methods, and presents only an intense
exothermic decomposition process. The apparent activation energy and pre-exponential factor of the decomposition reaction
were 286.0 kJ mol−1 and 1031.16 s−1, respectively. The critical temperature of thermal explosion of DDNI is 183.78 °C. Specific heat capacity of DDNI was studied
with micro-DSC method and theoretical calculation method, and the molar heat capacity is 217.76 J mol−1 K−1 at 298.15 K. The adiabatic time-to-explosion was also calculated to be a certain value between 14.54 and 16.34 s. DDNI presents
lower thermal stability, for its two ortho-hydroxyl groups, and its thermal decomposition process becomes quite intense. |
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