Journal of Industrial and Engineering Chemistry

  • Volume 68
  • /
  • Pages.153-160
  • /
  • 2018
  • /
  • 1226-086X(pISSN)
  • /
  • 1876-794X(eISSN)
The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis and characterization of a new energy material (guanidinium dinitramide) with crystallization solvent

  • Kim, Wooram (Department of Applied Environmental Science, Kyung Hee University) ;
  • Park, Mijung (Department of Applied Environmental Science, Kyung Hee University) ;
  • Park, Yeonsoo (Department of Applied Environmental Science, Kyung Hee University) ;
  • Kwon, Younja (Department of Applied Environmental Science, Kyung Hee University) ;
  • Jo, Youngmin (Department of Applied Environmental Science, Kyung Hee University)
  • Received : 2018.03.26
  • Accepted : 2018.07.26
  • Published : 2018.12.25
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Abstract

An environmentally favorable (chlorine-free) solid oxidizer, guanidinium dinitramide [GDN; $NH_2C(NH_2)NH_2N(NO_2)_2$], was newly synthesized from guanidine carbonate [$NH_2C(=NH)NH_2{\cdot}1/2H_2CO_3$]. Two different crystalline forms (${\alpha}-type$ and ${\beta}-type$) appeared according to the applied solvents and synthesis conditions. Moisture, during extraction, might become trapped in a crystal between inner molecules. Therefore, despite having the same chemical composition, Raman-IR and TGA-DSC revealed different physical characteristics of the two forms. Peaks of Raman shift near $1000cm^{-1}$ implied different chemical structures. Thermal analysis revealed an exothermic temperature $155.7^{\circ}C$ for ${\alpha}-type$ but one of $191.6^{\circ}C$ for ${\beta}-type$. The caloric value of ${\alpha}-type$ was 536.4 J/g, which was 2.5 times larger than that of the ${\beta}-type$, which was 1310 J/g. While the synthesized GDN of ${\alpha}-type$ showed a steep exothermic decomposition, the ${\beta}-type$ was slowly decomposed after melting through an endothermic process. This work implied that despite of the same molecular formula some different core thermal properties would appear depending on synthesis conditions.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF), Kyung Hee University

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