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http://dx.doi.org/10.14478/ace.2015.1114

Synthesis and Characterization of Guanidine Dinitramide Crystal  

Kim, Wooram (Department of Applied Environmental Science, Kyun Hee University)
Kwon, Younja (Department of Applied Environmental Science, Kyun Hee University)
Jo, Youngmin (Department of Applied Environmental Science, Kyun Hee University)
Park, Youngchul (Agency for Defense Development 4th R&D Institute 1 Department)
Publication Information
Applied Chemistry for Engineering / v.26, no.6, 2015 , pp. 737-742 More about this Journal
Abstract
An environmentally favorable solid oxidizer, guanidine dinitramide ($H_2C(NH_2)NH_2N(NO_2)_2$), with high purity and synthesis yield was prepared using guanidine carbonate ($NH_2C(=NH)NH_2{\cdot}1/2H_2CO_3$). Two different crystalline forms (${\alpha}$-form and ${\beta}$-form) were obtained depending on the solvent used and synthesis process. Despite of the same chemical composition, Raman-IR and TGA-DSC revealed that different structures existed between them. In particular, the thermal analysis showed the exothermic temperature of ${\alpha}$-form at $155.7^{\circ}C$ while $191.6^{\circ}C$ for ${\beta}$-form. The caloric value of ${\alpha}$-form was 536.4 J/g which was 2.5 times larger than that of ${\beta}$-form, 1310 J/g. In addition, ${\alpha}$-form was steeply decomposed with one-step variation, but ${\beta}$-form followed a two-step thermal decomposition pattern.
Keywords
Guanidine; nitramide; solid propellant; green oxidizer; crystal structure;
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Times Cited By KSCI : 1  (Citation Analysis)
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