Abstract

An experimental study to determine the dependence of the viscosity and shear stress of hydroxyl-terminated polybutadiene (HTPB) and dimeryl diisocyanate (DII) liner on curing time is presented. Viscosity and shear-stress were measured by HAAKE RheoStress 600 rheometer with parallel disks configuration at a constant temperature of 65 °C. The viscosity and shear-stress change were monitored for 8 h. Analysis of data showed that the liner viscosity and shear-stress dependency on time matched to pseudoplastic fluid model. For low shear-rates, the viscosity build-up is highest, with the logarithm of the viscosity being practically linear with time and the viscosity increases by more than two orders of magnitude for these cases. When the shear rates increase, the viscosity build-up slows down considerably with time and the viscosity is increased only by one order of magnitude.

Highlights

  • Liner for solid propellants is an elastomeric adhesive, improving mechanical properties between the insulation and the propellant (Quagliano et al 2015)

  • An isocyanate type curing agent is added to the slurry, which reacts with hydroxyl groups on the hydroxyl-terminated polybutadiene (HTPB) binder forming polyurethane bonds

  • As can be expected from the curing processes, the viscosity increases with time for all shear rates

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Summary

Introduction

Liner for solid propellants is an elastomeric adhesive, improving mechanical properties between the insulation and the propellant (Quagliano et al 2015). The common hydroxyl-terminated polybutadiene (HTPB) based liner is a composite matrix that consists mainly of filler powder, HTPB and various additives that determine the rheological and mechanical properties. This is a common technique that is used in many composite materials (Keller et al 2017; Keller et al 2018). An isocyanate type curing agent is added to the slurry, which reacts with hydroxyl groups on the HTPB binder forming polyurethane bonds. The rate of viscosity buildup and the time needed for a fully cured liner may not be correctly predicted and depends on the curing agent properties and characteristics (Randall and Lee 2003)

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