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The effect of crystal structure on the thermal reactivity of CL-20 and its C4-bonded explosives Part II. Models for overlapped reactions and thermal stability
Authors: Yan Qi Long | Zeman Svatopluk | Svoboda Roman | Elbeih Ahmed Ikhlas Mohamed | Málek Jiří
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 837-849
Titles:
Language Name Abstract Keywords
cze Vliv krystalové struktury na tepelnou reaktivitu CL-20 a jehoC4-pojené trhaviny (II): modely pro překrývající reakce a tepelnou stabilitu Na základě údajů z neizotermické TG byly specifikovány kritické teploty a mechanismus tepelné dekompozice PBXs C4. Byl nalezen dvojstupňový mechanismus tepelného rozkladu těchto PBX, kde první krok rozkladu je částečně řízen krystalovou strukturou CL-20. Interakce mezi C4 matricí a RS-epsilon-CL-20 je významný zejména v počáteční fázi, kde byl aktivační energie RS-epsilon-CL-20/C4 oceněna před separací píků, zatímco aktivační energie pro druhý krok, kvůli rozkladu molekuly CL-20, není možné vyhodnotit. První rozkladný krok pro alfa-CL-20, epsilon-CL-20/C4 a RS-epsilon-CL-20/C4 lze považovat za autocatalytický proces (AC model), zatímco druhý jako JMA model, který je rovněž použitelný pro čisté nitraminy alfa-CL-20 a-RS-epsilon-CL-20. To dokazuje, že matrice C4 by měla stabilizovat epsilon-CL-20, zatímco krystalová forma CL-20 má jen malý vliv na tepelnou stabilitu. kinetika tepelného rozkladu; CL-20; krystalová struktura; plasty pojené trhaviny; reakční model
eng The effect of crystal structure on the thermal reactivity of CL-20 and its C4-bonded explosives Part II. Models for overlapped reactions and thermal stability The critical temperature and mechanism functions for thermal decomposition of epsilon-CL-20, RS-epsilon-CL-20, alpha-CL-20, epsilon-CL-20/C4, and RS-epsilon-CL-20/C4 were evaluated based on non-isothermal TG data. A two-step mechanism has been found for thermal decomposition of alpha-CL-20, epsilon-CL-20/C4, and RS-epsilon-CL-20/C4, where the initial step is partly controlled by crystal structure of CL-20. The more reasonable mean activation energies could be obtained after peak separation for each individual steps. In fact, the activation energy for the post integrated process is almost equivalent with that of the second step, indicating that the total activation energy at the main decomposition process is dominated by thermolysis of CL-20 molecular. Besides, it has been found that the decomposition of C4 matrix does not affect the decomposition of normal epsilon-CL-20, resulting in identical activation energy and reaction model. However, the interaction between the C4 matrix and RS-epsilon-CL-20 is significant especially at the initial stage, where the activation energy of RS-epsilon-CL-20/C4 was overestimated before peak separation, while the activation energy for the second step due to thermolysis of CL-20 molecular is underestimated. The first decomposition step for alpha-CL-20, epsilon-CL-20/C4, and RS-epsilon-CL-20/C4 could be considered as autocatalytic process (AC model), whereas the second as JMA model, which is also applicable to that of pure epsilon-CL-20 and RS-epsilon-CL-20. Moreover, The critical temperatures of thermal explosion (T (b)) are obtained as 205.6, 205.5, 209.4, 214.4, and 227.5 A degrees C for alpha-CL-20, epsilon-CL-20, RS-epsilon-CL-20, epsilon-CL-20/C4, and RS-epsilon-CL-20/C4, respectively. It proves that the C4 matrix could stabilize epsilon-CL-20 while the crystal form of CL-20 has little effect on its thermal stability. thermal decomposition kinetics; CL-20; crystal structure; PBXs; reaction model

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