Mechanical properties of plateau burn azide composite propellants

The effects of cure ratio, crosslinking density, ammonium perchlorate (AP) particle size, and other additives on the mechanical properties of azide po lymer composite propellants were characterized. The equivalence ratio of 1. 0 and IPDI/TPA = 7/3 were effective on low temperature mechanical propertie s. Relatively high amount of plasticizer was required in BAMO/NMMO binder a nd preferred the equivalence ratio of 1.0 to retain itself in the three-dim ensional binder matrix. Excellent elasticity was obtained at a temperature range between -20 degrees C and 2 degrees C and normal strain rate dependen cy was obtained at from 54 degrees C to -20 degrees C. Glass transition occ urred at -30 degrees C to -35 degrees C in Sample 17. The increase in conta ct area between AP particle and binder and in bonding strength played an im portant role on the prevention of the propagation of crack around a boundar y and, therefore, is an element of(m) was increased with decrease of partic le size. Almost exactly the same sigma(m), however, was observed in whole t emperature range with increment of 5% to 10% in is an element of(m).