Iranian Scientific Association of Energetic Materials

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The aim of this research is investigation of mechanical properties regarding the polyurethanes as the binder of plastic bonded explosives. Due to the great effect of mechanical properties on application of these materials, the influence of Isocyanate/Hydroxyl ratio, crosslink density, the type of curing agent, hard segment and temperature on mechanical properties of these materials were investigated. The results revealed that with increasing of Isocyanate/Hydroxyl ratio, crosslink density, hard segment and the tensile strength of plastic bonded explosives increase. As well, the elongation at break of them decreases. Moreover, with increment of temperature, tensile strength and modulus of polyurethanes and then plastic bonded explosives decreased. The elongation at break point of these materials increased with increasing of temperature, as well. The investigations indicated that polyurethanes cured with MDI show the highest tensile strength and polyurethanes cured with IPDI illustrate the highest elongation at break.

Keywords: Plastic bonded explosives, Mechanical properties, Polyurethane, Isocyanate/ Hydroxyl ratio

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