An equation of state and detonation properties of hydrazine-nitromethane liquid mixtures

Binary mixtures of hydrazine and nitromethane were found to be nob-ideal as sociated solutions. An equation of state (EOS) of the hydrazine nitromethan e solutions has: been developed. This EOS takes into account the possibilit y of the formation uf associated molecules due to interactions between hydr azine and nitromethane molecules. EOS parameters, including a possible chem ical formula fur the associate and its standard heat of formation and entro py, have been determined. Thermodynamic calculations of detonation paramete rs of the hydrazine-nitromethane system have been done by means of the TDS code for a wide range of hydrazine content in the explosive mixture (0 80 w t.%). The reliability of the results is guaranteed by using both all accura te, theoretically justified EOS for detonation products, which is derived f rom first principles of statistical mechanics, and realistic potentials fur intermolecular interactions. It was shown that the use of the proposed EOS of the hydrazine- nitromethane solutions considerably improves the accurac y of the predicted detonation properties of the solutions and, furthermore allows orle tu evaluate their shock sensitivity.