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Effect of morphology on the isothermal decomposition kinetics of nitroguanidine

Thermochimica Acta, ISSN: 0040-6031, Vol: 712, Page: 179213
2022
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The thermal stability of nitroguanidine (NQ) with different morphologies was studied using a self-developed isothermal decomposition gas manometric device at both high and low temperatures. At 443.15–463.15 K, the total decomposition of needle-like NQ (N NQ) and hexagonal block-shaped NQ (H NQ) proceeded in two stages: a fast decomposition stage after heating, and a much slower decomposition stage later. It was indicated that all the models for N NQ and H NQ at the first stage followed the Avrami-Erofeev equation but with different values of n, while all the models at the second stage conformed to Parabola order. The decomposition rate of H NQ was faster than N NQ after heating, showing a better stability of N NQ. At 373.15–413.15 K, the initial decomposition kinetics were calculated. The activation energy calculated by mode-fitting method was 146.33 kJ/mol and 182.71 kJ/mol for N NQ and H NQ, respectively, which was consistent with the results obtained through model-free method. The average activation free energy (Δ G ≠ ), enthalpy (Δ H ≠ ) and entropy (Δ S ≠ ) for N NQ were 148.30 kJ/mol, 142.03 kJ/mol, and -15.81 J/(mol•K), respectively, while they were 139.61 kJ/mol, 184.42 kJ/mol, and 107.14 J/(mol•K) for H NQ. The storage life of N NQ and H NQ at 298.15 K were extrapolated to 21.58 and 29.44 years, respectively.

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