The dissolution properties of N-guanylurea-dinitramide (FOX-12) in dimethyl sulfoxide (DMSO).

The enthalpy of dissolution of FOX-12 in dimethyl sulfoxide (DMSO) was measured by means of a RD496-III Calvet microcalorimeter at 298.15 K. Empirical formulae for the calculation of the enthalpy of dissolution ( $$ \Updelta_{\text{diss}} H $$ ), relative partial molar enthalpy ( $$ \Updelta_{\text{diss}} H_{\text{partial}} $$ ), and relative apparent molar enthalpy ( $$ \Updelta_{\text{diss}} H_{\text{apparent}} $$ ) were obtained from the experimental data of the enthalpies of dissolution of FOX-12 in DMSO. The kinetic equation that describes the dissolution process of FOX-12 in DMSO at 298.15 K is determined as $$ \frac{{{\text{d}}\alpha }}{{{\text{d}}t}} = 8.5 \times 10^{ - 3} (1 - \alpha )^{0.59} $$ . [ABSTRACT FROM AUTHOR]