The role of sonication time upon acoustic wave absorption efficiency, microstructure, and viscoelastic behavior of flexible polyurethane/CNT nanocomposite foam

作者：Baferani A Hasani; Katbab A A^*; Ohadi A R

来源：European Polymer Journal, 2017, 90: 383-391.

DOI：10.1016/j.eurpolymj.2017.03.042

• Carbon nanotubes
• Nano composites
• Sonication time
• Acoustic
• Flexible polyurethane foam

In the present work, acoustic wave absorber nanocomposites based on flexible polyurethane (PU) foam and sonicated multi walled carbon nanotube (CNT) has been fabricated by in-situ solution polymerization of toluene diisocyanate (TDI) and an ether based polyol in the presence of CNT particles. This study provides the influence of sonication time upon the acoustical and dynamic mechanical properties of the prepared composites. Flow resistivity measurement, scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA) and compressive mechanical measurement were performed on the prepared samples. The fabricated PU/CNT foamed nanocomposites were evaluated for their acoustic wave absorbency within a wide range of frequency (400-6300 Hz). Nanocomposites originated by highly sonicated CNT exhibited more acoustic absorbency. All CNT filled PU composites showed higher attenuation of the acoustic wave energy than the unfilled reference sample. Results revealed that sound absorbency of the foamed PU/CNT nanocomposites could be effectively enhanced by increasing the sonication time. Dynamic mechanical temperature sweep measurements showed decrease in mechanical loss tangent by enhancing the extent of CNT dispersion state. Results showed that improved sound absorbancy by CNT sonication time is mainly caused by increased CNT interacting surfaces rather than viscous response of the viscoelastic PU/CNT nanocomposites towards the applied dynamic field.

• 出版日期2017-5