Abstract: The aluminum powder in the propellant can easily form a condensed phase with Al2O3 during the combustion process, which reduces the the specific impulse of propellant and the efficiency of nozzle, and aggravates the ablation of the nozzle. In order to improve the condensed agglomeration of aluminum powder during combustion, the researchers choose to introduce fluorine into the solid propellant. In this article, a fluorine-containing polyol was selected and added to two commonly used propellant adhesives (HTPE and PET). The mechanical properties of polyurethane film were significantly improved. The results of DSC and TG showed that the addition of fluorine-containing polyols did not have a large effect on the low temperature mechanical properties of the film, but showed different results for the thermal decomposition of the first stage. The introduction of the fluorine-containing polyol advanced the thermal decomposition of the first stage of the HTPE, but delayed the decomposition of the first stage of the PET polyurethane film. The laser ignition of the sample propellant and the surface element analysis of the flameout of the combustion sample showed that the introduction of the fluorine-containing polyol effectively improved the agglomeration of the condensed phase of the aluminum powder and increased the combustion efficiency.
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2020, Vol. 34 
