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      Structural Design and Sound Absorption Properties of Nitrile Butadiene Rubber-Polyurethane Foam Composites with Stratified Structure

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          Abstract

          Sound absorbing composites with stratified structures, including double-layer and sandwich structures, were prepared through the combination of nitrile butadiene rubber (NBR) and polyurethane foam (PUFM). The effects of the thickness ratio of layers, different stratified structures and the variety of fillers on the sound absorption performance of the NBR-PUFM composites and the sound absorption mechanism were studied. The results show that the NBR-PUFM composite with a sandwich structure and thickness ratio of 1:8:1 displays good sound absorption, which could be improved further by adding fillers. Because the airflow resistivity, resonance absorption, interface dissipation and interface reflection were combined organically in the sandwich structure, the composites show excellent low-frequency sound absorption performance. Moreover, the composite also has advantages in cost and functionalization aspects.

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          Acoustic metasurface with hybrid resonances.

          Guancong Ma, Min Yang, Songwen Xiao … (2014)
          An impedance-matched surface has the property that an incident wave generates no reflection. Here we demonstrate that by using a simple construction, an acoustically reflecting surface can acquire hybrid resonances and becomes impedance-matched to airborne sound at tunable frequencies, such that no reflection is generated. Each resonant cell of the metasurface is deep-subwavelength in all its spatial dimensions, with its thickness less than the peak absorption wavelength by two orders of magnitude. As there can be no transmission, the impedance-matched acoustic wave is hence either completely absorbed at one or multiple frequencies, or converted into other form(s) of energy, such as an electrical current. A high acoustic-electrical energy conversion efficiency of 23% is achieved.
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            Recent advances in vegetable oil-based polymers and their composites

            Samy A Madbouly, Michael Kessler, Thomas Garrison … (2017)
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              Composite 3D-printed metastructures for low-frequency and broadband vibration absorption.

              Kathryn H. Matlack, Anton Bauhofer, Sebastian Krödel … (2016)
              Architected materials that control elastic wave propagation are essential in vibration mitigation and sound attenuation. Phononic crystals and acoustic metamaterials use band-gap engineering to forbid certain frequencies from propagating through a material. However, existing solutions are limited in the low-frequency regimes and in their bandwidth of operation because they require impractical sizes and masses. Here, we present a class of materials (labeled elastic metastructures) that supports the formation of wide and low-frequency band gaps, while simultaneously reducing their global mass. To achieve these properties, the metastructures combine local resonances with structural modes of a periodic architected lattice. Whereas the band gaps in these metastructures are induced by Bragg scattering mechanisms, their key feature is that the band-gap size and frequency range can be controlled and broadened through local resonances, which are linked to changes in the lattice geometry. We demonstrate these principles experimentally, using advanced additive manufacturing methods, and inform our designs using finite-element simulations. This design strategy has a broad range of applications, including control of structural vibrations, noise, and shock mitigation.
              Article 0 comments Cited 78 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Polymers (Basel)
                Journal ID (iso-abbrev): Polymers (Basel)
                Journal ID (publisher-id): polymers
                Title: Polymers
                Publisher: MDPI
                ISSN (Electronic): 2073-4360
                Publication date (Electronic): 25 August 2018
                Publication date Collection: September 2018
                Volume: 10
                Issue: 9
                Electronic Location Identifier: 946
                Affiliations
                [1 ]Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan Institute of Technology, Wuhan 430205, China; jiangxl@ 123456wit.edu.cn (X.J.); wzj0038@ 123456126.com (Z.W.); tabjpz@ 123456163.com (Z.Y.); zhangfq@ 123456wit.edu.cn (F.Z.); youfeng.mse@ 123456wit.edu.cn (F.Y.)
                [2 ]College of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
                [3 ]Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, China
                Author notes
                [* ]Correspondence: chuyao@ 123456wit.edu.cn
                Author information
                https://orcid.org/0000-0003-4286-4942
                Article
                Publisher ID: polymers-10-00946
                DOI: 10.3390/polym10090946
                PMC ID: 6403634
                PubMed ID: 30960871
                SO-VID: f5080969-99c9-424c-8a65-21b107ebede7
                Copyright © © 2018 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 03 August 2018
                Date accepted : 24 August 2018
                Categories
                Subject: Article

                Keywords: nbr,pu foam,stratified structure,sandwich structure,sound absorption,low frequency
                Data availability:
                Keywords: nbr, pu foam, stratified structure, sandwich structure, sound absorption, low frequency

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