To shed light on the structure-property relationship of a methylnitroguanidine (MeNQ)-nitroguanidine (NQ) eutectic, its thermal behavior and microstructure were studied by various techniques. The eutectic composition of MeNQ-NQ with the lowest melting temperature (T m ) of 149.9 °C was at the mole ratio of 7 : 3, as determined by temperature-composition (T-X) and melting enthalpy-composition (H-X) diagrams. The MeNQ-NQ eutectic exhibited a homogeneous network structure composed of the plate-shaped MeNQ and acicular NQ enriched phases that resulted in a uniform melting around the T m observed by in situ variable temperature optical microscopy. The X-ray diffraction from MeNQ-NQ eutectic showed peaks that were shifted to low scattering angle, an indication of the expansion of its crystal lattice and the formation of solid solutions. Small-angle X-ray scattering from the sample showed a rough interface between the MeNQ-and NQ-enriched phases. Infrared spectral data showed absorption peaks due to À NH 2 and À CH 3 groups that were red shifted relative to the raw materials, an indication of hydrogen bond interactions between MeNQ and NQ molecules.
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