Mechanical properties of plateau burn azide composite propellants

  • Oyumi Y
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The effects of cure ratio, crosslinking d., ammonium perchlorate (AP) particle size, and other additives on the mech. properties of azide polymer composite propellants were characterized. The equivalence ratio of 1.0 and IPDI/TPA = 7/3 were effective on low temp. mech. properties. Relatively high amt. of plasticizer was required in BAMO/NMMO binder and preferred the equivalence ratio of 1.0 to retain itself in the three-dimensional binder matrix. Excellent elasticity was obtained at a temp. range between -20 and 2° and normal strain rate dependency was obtained at from 54 to -20°. Glass transition occurred at -30 to -35° in sample 17. The increase in contact area between AP particle and binder and in bonding strength played an important role on the prevention of the propagation of crack around a boundary and, therefore, εm was increased with decrease of particle size. Almost exactly the same σm, however, was obsd. in whole temp. range with increment of 5-10% in εm. [on SciFinder(R)]

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  • Yoshio Oyumi

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