Characterization and Damping Property of a Modified Polyurea Material

Abstract

Polyurea material has been used extensively as protective material in military, civil, marine engineering and other industries. The mechanical properties, thermal stability, damping performance and morphology of a modified polyurea material were investigated in this paper. Its properties were characterized by tensile testing, thermo gravimetric analysis (TGA), differential scanning calorimeter (DSC), scanning electron microscope (SEM), dynamic mechanical analyzer (DMA) and so forth. The thermal stabilities of this material were studied by means of TGA. The results of differential scanning calorimeter (DSC) and dynamic mechanical analysis (DMA) were used to identify the glass transitions region of the material. The temperature and frequency dependent storage modulus, loss modulus and loss factors were measured. The glass transition temperature of the material obtained through the DSC was -44.5℃ and 33.7℃ for Tgs and Tgh, respectively. The internal structural morphology was obtained by SEM images and analyzed to explain the damping performance in regard to the structure aspect. The results of this study showed that the modified polyurea material has excellent damping performance and can be used as a damping material to control vibration.