• Petkovic, Jelena
• Simić, Danica
• Galovic, Jela
• Brzic, Sasa
• Jelisavac, Ljiljana

Abstract

<jats:p>In the present study, the viscoelastic response of three composite solidpropellants based on hydroxyl-terminated poly(butadiene), ammoniumperchlorate and aluminum has been investigated. The investigation wassurveyed by dynamic mechanical analysis over a wide range of temperaturesand frequencies. The mechanical properties of these materials are related tothe macromolecular structure of the binder as well as to the content andnature of solid fillers. The storage modulus, loss modulus, loss factor andglass transition temperature for each propellant sample have been evaluated.The master curves of storage (log G' vs log ?) and loss modulus (log G'' vslog ?) were generated for each propellant. A comparison of logaT vstemperature curves for all propellants indicate conformance toWilliams-Landel-Ferry equation. Choosing the glass transition as thereference temperature, WLF equation constants are determined. Fractionalfree volume at the glass transition temperature and thermal coefficient offree volume expansion values are in accordance with the consideration thatAl is reinforcing filler.</jats:p>

Topics

• impedance spectroscopy
• aluminium
• glass
• glass
• composite
• glass transition temperature
• dynamic mechanical analysis