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Determination of plastoviscosity and the flow curve equation of stiff pastes by parallel plate plastometry

  • W. A. Dukes
  • Virginia M. Gledhill

Abstract

Plastic propellant is a stiff paste typically containing (by weight) 89% solids (ammonium perchlorate and perhaps aluminium and a burning catalyst), 1% synthetic surface-active agent and 10% polyisobutene. The polyisobutene has a nominal viscosity-average molecular weight of about 4 × 104 and a viscosity of about 100 kN/m2 (106 poise) at 25 °C, when measured at a very low shear-rate by the falling sphere (Stokes) method. The paste is similar to modelling clay or Plasticine, and may be considered to a first approximation as a Bingham solid subject to shear-hardening (1).

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Copyright information

© Springer-Verlag Berlin Heidelberg 1975

Authors and Affiliations

  • W. A. Dukes
    • 1
  • Virginia M. Gledhill
    • 1
  1. 1.Ministry of Defence (PF)Waltham Abbey, EssexEngland

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