Dissolution properties of N-guanylurea dinitramide (GUDN) in dimethyl sulfoxide and N-methyl pyrrolidone

The enthalpies of dissolution of N-guanylurea dinitramide (GUDN) in dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP) were measured using an RD496-2000 Calvet microcalorimeter at 298.15 K under atmospheric pressure, respectively. Empirical formulae for the calculation of the enthalpy of dissolution (Δdiss H), relative partial molar enthalpy (Δdiss H partial), and relative apparent molar enthalpy (Δdiss H apparent) were obtained from the experimental data of the dissolution processes of GUDN in DMSO and NMP. Furthermore, the corresponding kinetic equations describing the two dissolution processes were dα/dt = 10−3.39(1 − α)0.70 for the dissolution of GUDN in DMSO, and dα/dt = 10−4.06(1 − α)1.11 for the dissolution of GUDN in NMP.