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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012004717
pages 123-134

NG PLASTICIZED PE−PCP BINDER-BASED ADVANCED SOLID ROCKET PROPELLANTS: STUDIES ON MECHANICAL PROPERTIES

Shrikant M. Pande
High Energy Materials Research Laboratory (HEMRL), Defence Research and Development Organisation (DRDO)
Vaibhav S. Sadavarte
High Energy Materials Research Laboratory, Sutarwadi, Pune 411021, India
Debdas Bhowmik
High Energy Materials Research Laboratory
Haridwar Singh
High Energy Materials Research Laboratory, Pune 411 021; University of Hyderabad, Hyderabad

RÉSUMÉ

The mechanical properties of solid rocket propellants play a vital role in the efficient functioning of rocket motors over a wide range of temperatures. A propellant grain must maintain its structural integrity during storage, handling, and various dynamic loads, such as acceleration during flight. The tensile strength, percentage elongation and elastic modulus are the inherent properties of the propellant and are more significant during the development of solid propellant for a particular mission. The polymeric binder largely determines the mechanical properties of the propellant. In this study, the mechanical properties of the cured prepolymer, cured nitroglycerin (NG) plasticized pentaerythritol−polycaprolactone prepolymer (PE−PCP) binder, and propellants have been evaluated at different temperatures. The glass transition temperatures (Tg) of these samples were also evaluated to study the effect of plasticization, isocyanate used as the curing agent, and the NCO:OH ratio. Propellant formulations for case-bonded applications having high plasticizer (Pl) to polymer (Po) ratio (Pl/Po > 2) containing solid energetic materials as ingredients were evaluated for their structural integrity by determining the mechanical properties at ambient (+27° C), cold (−40° C), and hot (+55° C) conditions. It has been observed that the tensile strength, percent elongation, and elastic modulus increase at the cold condition (−40° C) compared to the ambient and hot conditions. This distinctive characteristic of the propellant is due to the presence of highly plasticized prepolymer in the formulation.