Document Type : Scientific extension


1 Ph.D Student, Department of Chemistry. Malek-Ashtar University of Technology .Tehran.Iran

2 PH. D Student. Department of Chemistry. Islamic Azad University , Rasht Branch.Rasht.Iran

3 M.Sc., Department of Chemical Engineering .Tabriz University Tabriz.Iran.

4 M.Sc., Department of Chemica Engineering Tarbiat Modares University.Tehran .Iran


Composite solid propellants have found wide spread applications in missile industries, such as high density, high specific impulse, and possibility of producing large scale grains. These solid propellants consist of three main chemical ingredients, including oxidizer, fuel, and binder. Recently ,Hydroxyethyl Terminal Poly-Butadiene (HTPB) has been used abundantly for these propellants due to its good mechanical properties and ability to high solid loading (88 to 90% of solid loading, including Al and AP). The mechanical properties of solid rocket propellants are crucial for proper functioning of rocket engines. In this study, the effect of T313 (chain extender) and MAPO (bonding agent) on mechanical properties of propellant is investigated. In addition tothe necessity of these substances in the propellant, the formulation and the reasons for utilizing MAPO and T313 are discussed. Different compositions havebeen prepared by incorporating different percents of MAPO and T313 for evaluation. Also, their effects on pot life, mechanical properties, and density are studied. Based on the results, the amount of MAPO and T313 should be used in optimum amount and these compounds have great influence on the rheological and mechanical properties.


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