Preparation and Characterization of Some Selected Double Base Propellant Formulations

Abstract

Effect of energetic base (NC and NG) variation and plasticizer change were investigated in this work. The gradual increase of (NG %) at the expense of (NC %) increased the burning rate up to 40%, whereas the maximum stress (σm) value has been reduced gradually. No significant change could be detected in density, heat of explosion and ignition temperature. The plasticizer content could be decrease from 11% to 9 % at constant NG percentage (35%) without any significant effect on either density or ignition temperature. On the other hand these variations cause a slight effect on stress and the strain. The young's modulus dropped from 438 to 207 and the hardness decreases from 73 to 66 Shore A. whereas the burning rate has been increased by about 26%. DB4 formulation composed of 48% NC, 35% NG, 9.5% inert plasticizer and 7.5% other additives was satisfying the criteria of base bleed where its maximum stress was 29 Kg_f/cm² and strain was found to be about 39%.