Journal of Polymer & Composites Original Research Special issue

Characterization of Thermochemical Properties and Combustion Behavior In AP/HTPB Polymer Composite Solid Propellant for Enhanced Performance

  1. P.N. Kadiresh Department of Aerospace Engineering, B.S. Abdur Rahman Crescent Institute of Science and Technology, Vandalur, Chennai
  2. K. Raja Department of Mechanical Engineering, Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology, Avadi, Chennai
  3. S.P. Venkatesan Department of Mechanical Engineering, Sathyabama Institute of Science and Technology, Chennai

Abstract

The thermal decomposition of solid propellants containing hydroxyl-terminated polybutadiene (HTPB) binder is a complex process, driven by multiple interacting chemical and physical factors. Solid propellant combustion characteristics are profoundly influenced by the composition of the propellant, the conditions of pressure, the starting temperature, and a range of aero-thermochemical parameters. The paper explores the influence of polymeric structure in the HTPB binder on thermal decomposition characteristics of the AP/HTPB composite propellants and correlates material properties to superior performance results in composite formulations of relevance to aerospace applications. In this study, the thermal decomposition of AP/HTPB based propellant samples are analyzed through thermo-gravimetric analysis and differential thermal analysis traces were obtained on a simultaneous thermal analyzer. Thermogravimetric analysis facilitates the investigation of decomposition kinetics in solid rocket propellants. Thermogravimetric analysis is executed to assess the thermal decomposition behaviors of propellants samples across a temperature range of 27℃ to 927 ℃ at different heating rates. Propellant samples weighing 2.5 mg to 3 mg have been used for the analysis. The rate at which a solid composite propellant burns is a crucial ballistic characteristic, closely linked to the highest decomposition temperature seen in particular formulations of the propellant. The activation energy, inferred from the slope of the Kissinger plot, was found to be 230.64 kJ/mol.

Keywords

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