Ayman M. Mohamed, Kui Yao, Yasmin M. Yousry, Junling Wang, and Seeram Ramakrishna, "Open-cell P(VDF-TrFE)/MWCNT Nanocomposite Foams with Local Piezoelectric and Conductive Effects for Passive Airborne Sound Absorption", Journal of Applied Physics, Vol. 127, No. 21, 214102, 2020. (Online, 03 June 2020, https://doi.org/10.1063/1.5140213).
Abstract:
Open-cell nanocomposite foams of poly(vinylidene fluoride-co trifluoroethylene) (P(VDF-TrFE)) and multi-walled carbon nanotubes (MWCNTs) were investigated for airborne sound absorption. When MWCNTs were well dispersed in the P(VDF-TrFE) matrix, the degree of crystallinity of the polar phase of the polymer was enhanced and hence the local piezoelectric effect, and the electrical conductivity varied by nearly 7 orders of magnitude dependent on the amount of MWCNT loading. The measurements in a standard acoustic tube showed that introduction of an appropriate amount of MWCNTs significantly enhanced the airborne sound absorption coefficient of P(VDF-TrFE) foam without poling, particularly in the lower and intermediate frequency range (below 2 kHz), which is attributed to local piezoelectric effect in the polar polymer matrix and charge dissipation through the conductive MWCNT interfacing the polar phase. The experimental results and data analysis indicate that the open-cell nanocomposite foam with optimal combination of local piezoelectric effect and electrical conductivity is promising for noise mitigation applications with enhanced passive airborne sound absorption.
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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).
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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (Ayman M. Mohamed, Kui Yao, Yasmin M. Yousry, Junling Wang, and Seeram Ramakrishna, "Open-cell P(VDF-TrFE)/MWCNT Nanocomposite Foams with Local Piezoelectric and Conductive Effects for Passive Airborne Sound Absorption", Journal of Applied Physics, Vol. 127, No. 21, 214102, 2020) and may be found at (https://doi.org/10.1063/1.5140213t).