Open-Cell Poly(vinylidene fluoride) Foams with Polar Phase for Enhanced Airborne Sound Absorption

Open-Cell Poly(vinylidene fluoride) Foams with Polar Phase for Enhanced Airborne Sound Absorption
Title:
Open-Cell Poly(vinylidene fluoride) Foams with Polar Phase for Enhanced Airborne Sound Absorption
Other Titles:
Applied Physics Letters
DOI:
10.1063/1.5048336
Publication Date:
27 August 2018
Citation:
Appl. Phys. Lett. 113, 092903 (2018); https://doi.org/10.1063/1.5048336
Abstract:
Open-cell foams of polyvinylidene fluoride (PVDF) homopolymer were fabricated with the content of polar phase changed by thermal treatment, and their airborne acoustic absorption performance properties were measured comparably in an acoustic tube. The experimental results showed that the sample with the more polar phase and hence stronger local piezoelectric effect exhibited significantly larger acoustic absorption coefficient. In addition to the conventional visco-inertial, thermal and materials damping effects, our analysis indicated that the thin and polar struts of PVDF foams with polar phase and local piezoelectric effect may further enhance the mechanical damping by converting the excited mechanical vibration to electricity through the local piezoelectric effect, and increasing the friction and viscous loss at the fluid-solid interface with the presence of electrical charges. The open-cell polymer foams with high content of polar phase and local piezoelectric effect have great potential for passive airborne noise mitigation applications.
License type:
PublisherCopyrights
Funding Info:
This project is partially supported by Singapore Maritime Institute under the Maritime Sustainability R&D Programme, Project ID: SMI-2015-MA-07 (IMRE/16-7P1125), and by the Singapore Ministry of National Development and National Research Foundation under L2NIC Award No. L2NICCFP1-2013-9 (IMRE/14-9P1112).
Description:
ISSN:
0003-6951
1077-3118
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