Iranian Scientific Association of Energetic Materials

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Hydroxyl terminated polybutadien that is known as HTPB resin is a liquid hydrocarbon polyol that is commonly used in preparation of solid composite propellants. Because of unsaturated nature of repeating unit of HTPB polymer , it has high potential for oxidative aging . In this paper ,we have investigated aging behaviors of two types of HTPB which having various content of phenolic antioxidant. For this purpose ,two samples of resin have stored at 60 °C and atmospheric pressure and change on their properties, such as peroxide value,hydroxyl value,epoxy number,viscosity and molecular weight have investigated.Under basis of results, we can conclude during the oxidative aging of HTPB, coupling of radical chain is the most important elementary reaction that occurred in HTPB resin and would change its properies.

Keywords: HTPB, propellant composite, polyurethane-based HTPB, thermal oxidation, antioxidant.

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