Influence of bicurative on processibility of composite propellant

A new series of composite propellant compositions, based on ammonium perchlorate, hydroxy-terminated polybutadiene and having metallic fuel as aluminium powder, have been developed. Pressure cast-cum-cured compositions have also been developed with toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), and a mixture of both curatives, i.e., TDI and IPDI, respectively, to study their effect on processibility, mechanical and ballistic properties of the compositions. The data indicate that the compositions based on bicurative have a pot life of 7–8 h, viscosity build up is from 13280 poise to 14080 poise after 4 h, and the smooth processibility of the slurry is enhanced. Further, the mechanical properties are in the range 12.2 kg/cm², 40.2 kg/cm², and 40.2 per cent for tensile strength, E-modulus and elongation, respectively, and burn rate is almost the same, i.e., 16±0.5 mm/s.