Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 105, Issue 1, Pages 293-300Publisher
SPRINGER
DOI: 10.1007/s10973-010-1244-4
Keywords
4,5-Dihydroxyl-2-(dinitromethylene)-imidazolidine (DDNI); 1,1-Diamino-2,2-dinitroethylene (FOX-7); 2-(Dinitromethylene)-1,3-diazacyclopentane (DNDZ); Synthesis; Thermal behavior
Funding
- National Natural Science Foundation of China [20803058]
- Basal Science Foundation of National Defense [B0920110005]
- Education Committee Foundation of Shaanxi Province [2010JK881]
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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 A degrees 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 10(31.16) s(-1), respectively. The critical temperature of thermal explosion of DDNI is 183.78 A degrees 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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