Stabilizer Mixture Choosing For Double Base Solid Propellants Based on (Solid – Liquid) Phase Equilibrium

In double base propellants, due to inherent instability of nitroesters compunds, ageing occurs. Stabilizer using, is one of the common method in order to increase propellant's lifespan. Considering that there is no ideal stabilizer compound, stabilizer mixtures have been used to increase stability. In stabilizer mixtures, the higher eutectic point leading to lower immigration of them from propellants matrix to surface. In this research, eutectic point of five stabilizer mixtures contains (diphenylamine + ethylcentralite), (2-nitrodiphenylamine + methylcentralite), (diphenylamine + methylcentralite), (acardite II + methylcentralite) and (2-nitrodiphenylamine + ethylcentralite) were calculated as 289.31, 336.52, 294.41, 371.19 and 325.15 K, respectively. The mixture of acardite II and methyl centralite is more favorable than other mixtures due to its higher eutectic point. In the continuation of this article, the behavior of the mixed phase of stabilizers was analyzed by ideal, Wilson and UNIQUAC models. Results determined that Ideal, Wilson and UNIQUAC models can be correlated experiential melting point with maximum 11.97, 5.6 and 2.69 % error.