THE COMPATIBILITY OF MODEL FOR LOW SHEAR FLOW ANALYSIS IN DEVELOPING PLASTICIZED HTPB-BASED BINDER

Afni Restasari; Luthfia Hajar Abdillah; Retno Ardianingsih; Bagus Wicaksono; Rika Suwana Budi

doi:10.21009/SPEKTRA.053.03

Afni Restasari National Institute of Aeronautics and Space (LAPAN), Jakarta, Indonesia
Luthfia Hajar Abdillah National Institute of Aeronautics and Space (LAPAN), Jakarta, Indonesia
Retno Ardianingsih National Institute of Aeronautics and Space (LAPAN), Jakarta, Indonesia
Bagus Wicaksono National Institute of Aeronautics and Space (LAPAN), Jakarta, Indonesia
Rika Suwana Budi National Institute of Aeronautics and Space (LAPAN), Jakarta, Indonesia

DOI: https://doi.org/10.21009/SPEKTRA.053.03

Keywords: zero shear viscosity, flow behaviour, propellant, plasticizer

Abstract

In developing flow behavior of plasticized prepolymer as liquid content of composite solid propellant, zero shear viscosity (ZSV) is a critical parameter that Goh-Wan equation is developed to model it recently [1]. Thus, this work aims to analyze the compatibility of the Goh-Wan equation toward the liquid content of propellant, characterize it, and determine the limit. In this work, a varied flow behavior index was obtained by using Hydroxy terminated polybutadiene (HTPB) and HTPB-DOA (Dioctyl adipate) system with the variable of its concentration, pre-heating, and pre-stirring methods as samples. Viscosity was measured at 2, 3, 4, and 5 rpm by using the disc spindle of Brookfield viscometer. For the minimum shear-rate investigation, as a limit of compatibility, other three sets of shear rates are applied, which are 0.6 – 5 rpm, 1 – 5 rpm, and 1,5 – 5 rpm. By functioning Goh-Wan equation (model 1) and Power-Law (model 2), a model was categorized as compatible if yields lower value of ZSV than the first experimental measured viscosity (η_1st). Characterization was determined by a graph of plotting percentage difference of ZSV obtained from models 1 and 2 towards the index of flow behavior. The 3% of the difference between ZSV obtained from model 1 and η_1st was set to be a minimum value for a set of applied shear-rate to be acceptable. It is reported that the Goh-Wan model is compatible with the liquid content of propellant and characterized by a perfect linear correlation. It is also found that a minimum applied shear rate of 1.5 rpm is acceptable for model compatibility.

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