Investigation on the dissolution behavior of 2HNIW·HMX co-crystal prepared by a solvent/non-solvent method in N,N-dimethylformamide at T = (298.15–318.15) K
2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexazisowurtzitane (HNIW)·1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) co-crystal in a 2:1 molar ratio was prepared by a solvent/non-solvent method, and the co-crystal has been characterized by several methods. The enthalpies of dissolution of 2HNIW·HMX co-crystal in N,N -dimethylformamide at different temperatures were measured by a DC08-1 Calvet microcalorimeter under standard atmospheric pressure, and it is indicated that the dissolutions are exothermic process. The empirical formulae for the calculation of the molar enthalpy ( \(\Delta_{\text{diss}} H\) ) of dissolution, relative partial molar enthalpy ( \(\Delta_{\text{diss}} H_{\text{partial}}\) ), relative apparent molar enthalpy ( \(\Delta_{\text{diss}} H_{\text{apparent}}\) ), and enthalpy of dilution ( \(\Delta_{\text{dil}} H_{1,2}\) ) at 298.15 K are obtained. The differential enthalpies ( \(\Delta_{\text{dif}} H\) ) and kinetic equations describing the dissolution process at different temperatures are deduced. Furthermore, the apparent activation energy E = 10.54 ± 0.22 kJ mol -1 and pre-exponential constant A = 0.34 ± 0.03 s −1 of 2HNIW·HMX co-crystal are obtained. The standard molar Gibbs free energy of activation ( \(\Delta G_{ \ne }^{\theta }\) ) at different temperatures is 86.44 ± 0.02 kJ mol −1 (298.15 K), 88.02 ± 0.03 kJ mol −1 (303.15 K), 89.61 ± 0.01 kJ mol −1 (308.15 K), 91.18 ± 0.01 kJ mol −1 (313.15 K), and 92.75 ± 0.02 kJ mol −1 (318.15 K), respectively. The standard molar entropy of activation ( \(\Delta S_{ \ne }^{\theta }\) ) and standard molar enthalpy of activation ( \(\Delta H_{ \ne }^{\theta }\) ) are − 262.55 ± 0.72 J mol −1 K −1 and 7.98 ± 0.22 kJ mol −1 , respectively.
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