In this work, the ethylene‐propylene‐diene monomer (EPDM) foam was fabricated via 4‐4′‐oxobisbenzenesulfonyl hydrazide (OBSH) and phenolic resin (PF) in an effort to prepare the sound‐absorbing composite which has excellent sound absorption at the medium and low frequency. For single‐layer EPDM foams, cell morphology showed a certain pattern, causing the peak of the sound absorption coefficient move to a higher frequency and the peak value reached a maximum of about 0.75 as the OBSH content increased. In addition, with the foaming temperature increasing, the cell morphology had a different tendency and the peak of the sound absorption coefficient moved first to the higher frequency and then to the lower frequency due to the vulcanization reaction. Compared with the single‐layer EPDM foams, the sound absorption curve of the double‐layer composite made of the single‐layer EPDM foam and pure EPDM sheet with cavities moved to a lower frequency by about 400 Hz. The theoretical calculation method was used to verify the accuracy of the experimental results. This work provided a simple approach to control the sound absorption property of EPDM foamed material and its double‐layer composite through from an experimental and theoretical perspective.

中文翻译：

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通过实验方法和理论验证来改善吸声性能的乙烯-丙烯-二烯单体泡沫及其双层复合材料的设计

在这项工作中，乙烯-丙烯-二烯单体（EPDM）泡沫是通过4-4'-氧代双苯磺酰肼（OBSH）和酚醛树脂（PF）制成的，目的是制备在吸声时具有出色吸声性能的吸声复合材料。中低频。对于单层EPDM泡沫，泡孔形态表现出一定的模式，导致吸声系数的峰值移至更高的频率，并且随着OBSH含量的增加，峰值达到约0.75的最大值。另外，随着发泡温度的升高，泡孔形态具有不同的趋势，并且由于硫化反应，吸声系数的峰值首先移至较高的频率，然后移至较低的频率。与单层EPDM泡沫相比，由单层EPDM泡沫和纯EPDM片材制成的双层复合材料的吸声曲线，腔体移至较低的频率约400 Hz。用理论计算方法验证了实验结果的准确性。这项工作从实验和理论的角度为控制EPDM泡沫材料及其双层复合材料的吸声性能提供了一种简单的方法。