Influence of Combustion Modifiers on the Cure Kinetics of Glycidyl Azide Polymer Based Propellant-Evaluated through Rheo-Kinetic Approach.

Liming He,Sulan Dai,Zhongliang Ma,Jun Zhou

doi:10.3390/polym11040637

Abstract

To investigate the influence of combustion modifiers on the curing of glycidyl azide polymer spherical propellants (GAPSPs), the curing process of the GAPSPs was explored using an isothermal rheological measurement method. The parameters of cure kinetics were solved to further establish a kinetic model for the curing reaction of GAPSPs. The results showed that the curing process of GAPSPs under isothermal conditions conformed to the Kamal and LSK (Lu–Shim–Kim) models. The model data indicated significant agreement with the experimental data. The influence of four kinds of combustion performance modifiers on the curing process was explored and the results demonstrated that lead phthalate had a catalytic effect on the curing reaction of GAPSPs, whilst oxides of lead and copper, and copper adipate had no influence on the curing reaction.

Highlights

Glycidyl azide polymer (GAP), as a novel azeotropic binder, has been widely used in solid propellants and paste propellants [1,2,3,4,5]
We focused on the curing mechanisms of GAP modified spherical propellants (GAPSPs)
Using a curing kinetics method based on isothermal conditions, the curing process of GAPSPs was investigated

Summary

Introduction

Glycidyl azide polymer (GAP), as a novel azeotropic binder, has been widely used in solid propellants and paste propellants [1,2,3,4,5]. GAP propellant has the advantages of high energy, high density, and a low characteristic signal; its mechanical properties are needed to be improved [6,7]. Michael [8] mixed GAP with nitrocellulose (NC) and introduced it into the propellant to improve the energy and mechanical properties of the propellant. Luo Yunjun et al [9,10,11] combined GAP with NC to obtain novel GAP modified spherical propellants (GAPSPs), which were applied to a cross-linked modified double-base propellant and achieved good results. The advantage of the rheological measurement method is that it can more intuitively reflect the modulus change of the system during the curing process, and it can intuitively describe the state change of the curing system, which has an important guiding role for the actual production process

Methods

Results

Conclusion