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首页> 外文期刊>Journal of Applied Polymer Science >Polyurethane/poly(vinylidene fluoride)/MWCNT composite foam for broadband airborne sound absorption
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Polyurethane/poly(vinylidene fluoride)/MWCNT composite foam for broadband airborne sound absorption

机译：聚氨酯/聚（偏二氟乙烯）/ MWCNT复合泡沫用于宽带空气载体吸收

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摘要

A polyurethane/poly(vinylidene fluoride)/multi-walled carbon nanotubes (PU/PVDF/MWCNT) (83/15/2) composite foam was designed and fabricated. The foam exhibited high airborne sound absorption performance in a wide-frequency range. The sound absorption coefficient reached the value of 0.85 at 1 kHz, which is a significant improvement over PU foam. It was found that PVDF formed a separate immiscible phase and part of it was crystallized in a polar phase in the PU scaffold in the PU/PVDF/MWCNT composite, which could benefit the sound absorption performance by introducing interfacial damping and local piezoelectric damping effects. The introduction of the conductive MWCNT filament in the composite foam further improved sound absorption, possibly by facilitating the dissipation of the electrical charges generated from local piezoelectric effect and enhancing both the interfacial damping effect and local piezoelectric damping effect. With PU as the main ingredient, the fabrication scalability of the foam can be improved with significantly reduced material and production cost in comparison with PVDF foam. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47868.
机译：设计和制造了聚氨酯/聚（偏二氟乙烯）/多壁碳纳米管（PU / PVDF / MWCNT）（PU / PVDF / MWCNT）（83/15/2）复合泡沫。泡沫在宽频率范围内表现出高空气发声吸收性能。声音吸收系数达到1kHz的0.85的值，这是对PU泡沫的显着改善。发现PVDF形成了单独的不混溶相，其中一部分在PU / PVDF / MWCNT复合材料中在PU支架中的极性相中结晶，这可以通过引入界面阻尼和局部压电阻尼效应来利用吸声性能。在复合泡沫中引入导电MWCNT长丝进一步改善了吸声，可能是通过促进从局部压电效应产生的电荷的耗散，并提高界面阻尼效果和局部压电阻尼效果。用PU作为主要成分，可以改善泡沫的制造可扩展性，与PVDF泡沫相比，材料和生产成本显着降低。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47868。

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