Damping behavior and acoustic performance of polyurethane/lead zirconate titanate ceramic composites

0-3 Type PU-based lead zirconate titanate ceramic (PZT) composites are prepared by in situ polymerization method, this PU/PZT composite material has excellent sound absorption property at low frequencies because of damping property and piezoelectric property. The dispersion of PZT particles in PU matrix, dielectric loss tangent (tan delta), dynamic storage modulus (E'), dynamic loss modulus (E ''), and the acoustic absorption coefficient (a) of PU/PZT composites are studied by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA) and two-microphone impedance tube, respectively. The results indicate that the modified PZT particles dispersed well in PU matrix with the content of 30 wt%; the tan delta, E' and E '' are 0.62, 3.75 GPa and 6.05 GPa, respectively, when the composite with 30 wt% of polarizing PZT; the acoustic absorption coefficient is found to increase with an increase of PZT content, and the average acoustic absorption coefficient is 0.32 at low frequencies from 125 to 500 Hz. (C) 2012 Elsevier Ltd. All rights reserved.