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首页> 外文期刊>Journal of Applied Polymer Science >Properties and mechanism of a novel metallic-hollow-spheres/polyurethane acoustic composite
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Properties and mechanism of a novel metallic-hollow-spheres/polyurethane acoustic composite

机译：新型金属 - 空心 - 球体/聚氨酯声学复合材料的性质及机理

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摘要

In this article, 316L stainless steel hollow spheres (316L HS) and polyurethane (PU) resins were used to prepare a novel metallic-hollow-sphere/polyurethane (MHSP) acoustic composite by casting. The acoustic experimental results of this composite revealed that compared to monolithic PU, the sound transmission loss of the composites increased and the maximum sound absorption peak shifted to lower frequency with the change of acoustic impedance and resonance frequency. When the surface of metallic hollow sphere used in MHSP composite was modified by silane coupling agent, the sound insulation and sound absorption performance of MHSP composites were further improved. This is related to the addition of the molecular layer of coupling agent between MHSP matrix. In addition, the addition of silane coupling agent creates PU foaming in matrix, resulting in a large number of pores and gaps that can increase the sound waves energy loss through air friction and heat exchange.
机译：本文采用316L不锈钢空心球（316L-HS）和聚氨酯（PU）树脂，通过浇铸法制备了新型金属空心球/聚氨酯（MHSP）声学复合材料。声学实验结果表明，与整体聚氨酯相比，随着声阻抗和共振频率的变化，复合材料的声传输损耗增加，最大吸声峰向低频移动。采用硅烷偶联剂对MHSP复合材料中的金属空心球表面进行改性，进一步提高了MHSP复合材料的隔声和吸声性能。这与MHSP基质之间添加偶联剂分子层有关。此外，硅烷偶联剂的加入在基体中产生PU发泡，导致大量孔隙和间隙，从而通过空气摩擦和热交换增加声波能量损失。

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