Enhanced airborne sound absorption effect in poly(vinylidene fluoride)/(K0.5Na0.5)NbO3-nanofiber composite foams

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

10 Scopus Citations
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Author(s)

  • Ayman M. Mohamed
  • Kui Yao
  • Yasmin M. Yousry
  • Junling Wang
  • Seeram Ramakrishna

Detail(s)

Original languageEnglish
Article numbere49022
Journal / PublicationJournal of Applied Polymer Science
Volume137
Issue number35
Online published27 Jan 2020
Publication statusPublished - 15 Sept 2020
Externally publishedYes

Abstract

Introducing electrical conductive function to discharge local piezoelectric effect is found effective for improving airborne sound absorption performance. In this work, instead of conductive fillers, a composite with two piezoelectric materials with opposite piezoelectric responses was explored aiming at enhanced sound absorption effect. Open-cell poly(vinylidene fluoride)/(K0.5Na0.5)NbO3 (PVDF/KNN)-nanofiber composite foams were proposed and investigated for airborne sound absorption purpose. Structural and thermal analyses showed that the KNN nanofibers were well dispersed in the PVDF matrix and enhanced the degree of crystallinity of polar phase of PVDF. Significantly enhanced airborne sound absorption over a broad frequency range was observed in the PVDF/KNN-nanofiber composite foams, with increasing KNN nanofibers. One possible mechanism for the improved sound absorption with the piezoelectric KNN nanofibers with positive piezoelectric coefficient added in the PVDF matrix with negative piezoelectric coefficient is that electrical discharge could be facilitated for energy dissipation with the opposite charges generated through the piezoelectric effects in the two phases with opposite polarity. The experimental results show that the open-cell PVDF/KNN-nanofiber composite foams are promising for broadband airborne sound absorption application, and our analysis shed a light on the strategy in designing piezoelectric composite foam with high sound absorption performance. © 2020 Wiley Periodicals, Inc.

Research Area(s)

  • foams, nanocomposites, nanofiber, piezoelectricity, polymers, sound absorbers

Citation Format(s)

Enhanced airborne sound absorption effect in poly(vinylidene fluoride)/(K0.5Na0.5)NbO3-nanofiber composite foams. / Mohamed, Ayman M.; Yao, Kui; Yousry, Yasmin M. et al.
In: Journal of Applied Polymer Science, Vol. 137, No. 35, e49022, 15.09.2020.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review