Publication detail

The effect of crystal structure on the thermal reactivity of CL-20 and its C4 bonded explosives (I): thermodynamic properties and decomposition kinetics

Authors: Yan Qi Long | Zeman Svatopluk | Elbeih Ahmed Ikhlas Mohamed | Song Zhen-Wei | 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: 823-836

Titles:

Language	Name	Abstract	Keywords
cze	Vliv krystalové struktury na tepelnou reaktivitu CL-20 a jehoC4-pojené trhaviny (I): termodynamické vlastnosti a rozkladná kinetika	Pomocí neizotermické FTIR, TG a DSC technik jsou zkoumány krystalová struktura, tepelné chování a kinetika rozkladu epsilon-CL-20, -RS-epsilon-CL-20, alfa-CL-20, epsilon-CL-20/C4 a RS-epsilon-CL-20/C4. Tepelný rozklad alfa-CL-20 epsilon-CL-20/C4 a RS-epsilon-CL-20/C4 lze považovat za dvoustupňový proces. Krystalová struktura CL-20 může ovlivnit pouze první krok rozkladu a uvolňování celkového tepla; uvolňování tepla z RS-epsilon-CL-20 je nejvyšší ve srovnání s alfa- a normální epsilon-CL-20. Kinetický kompenzační efekt ukazují, že studovné materiály lze rozdělit do dvou skupin, epsilon-CL-20, -RS-epsilon-CL-20, alfa-CL-20 včetně a epsiloln-CL-20/C4, které se rozkládají v pevném stavu a další včetně epsilon-CL-20/Formex a RS-epsilon-CL-20/C4, které se rozkládají v částečně kapalném stavu, což vede k odlišnému kinetickému kompenzačnímu efektu. To ukazuje, že matrice C4 by mohly ovlivnit distribuci aktivačních energií epsilon-CL-20 a-RS-epsilon-CL-20 úplně jiným způsobem.	kinetika termálního rozkladu; CL-20; krystalová struktura; PBX; kinetický kompenzační efekt
eng	The effect of crystal structure on the thermal reactivity of CL-20 and its C4 bonded explosives (I): thermodynamic properties and decomposition kinetics	The crystal structure, thermal behavior, and decomposition kinetics of epsilon-CL-20, RS-epsilon-CL-20, alpha-CL-20, epsilon-CL-20/C4, and RS-epsilon-CL-20/C4 were investigated by nonisothermal FTIR, TG, and DSC techniques. It was found that the thermal decomposition of alpha-CL-20, epsilon-CL-20/C4, and RS-epsilon-CL-20/C4 could be considered as a two-step process and the initial step is partly controlled by crystal structure. However, the crystal structure could only affect the initial step of decomposition and the total heat release, and the heat release of RS-epsilon-CL-20 is the highest compared with alpha- and normal epsilon-CL-20. In addition, the activation energy of studied materials was calculated by Kissinger method and modified KAS method, which was compared with the results obtained by other researchers. It was indicated that the obtained activation energy of epsilon-CL-20 by Kissinger method is about 176.0 kJ mol(-1), which is almost the same with the results from the literatures by STABIL and Noniso-TG methods. It was noticed that the crystal structure has significant effect on the initial activation energy distribution of CL-20, while in case of second stage (alpha = 0.30-0.85) this effect is relatively small, resulting in identical decomposition mechanism. Moreover, the kinetic compensation effects show that the studied materials could be divided into two groups, one including epsilon-CL-20, RS-epsilon-CL-20, alpha-CL-20, and epsilon-CL-20/C4 which decompose at solid state and another including epsilon-CL-20/Formex and RS-epsilon-CL-20/C4 which decompose at partial liquid state, resulting in different kinetic compensation effects. It reveals that the C4 base could affect the distribution of activation energy of epsilon-CL-20 and RS-epsilon-CL-20 in a totally different way.	thermal decomposition kinetics; CL-20; crystal structure; PBXs; kinetic compensation effects

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