On the viscoelasticity of the polyurethane foam

In this paper a method is presented that allows the characterization of Young’s modulus behavior of the polyurethane foam frame. This parameter has been evaluated according to a technique based on the measurement of the dynamic mass of a cylindrical sample in a rough vacuum. In the approximate temperature range 20 to −15 °C the Young’s modulus has been measured over the approximate frequency range of 102 Hz–2 kHz. The effect of the temperature on the dynamic mass components, principally on its imaginary part has led to the use of the Williams-Landel-Ferry (WLF) theory to describe the Young’s modulus behavior over a wide range of frequencies.