Both soundproofing and mechanical strength present significant challenges in the context of sound-insulating materials. Herein, to take advantage of higher intermolecular interactions of ester groups, a soundproofing open-cell Microcellular Polyurethane Foam (MPUF) was developed using polymer-grafted polyester polyol (POP) and saturated polyester polyol. The POP was synthesized by grafting polystyrene on unsaturated polyester polyol (UNPES) in a saturated polyester polyol media. The amount of styrene monomer and UNPES were changed and the POP with optimum properties was selected. The successful synthesis of POP was approved by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H NMR), and gel permeation chromatography (GPC). The spherical morphology of selected POP with a diameter of about 500 nm was confirmed by scanning electron microscopy (SEM) and dynamic light scattering (DLS) analysis. MPUFs containing different amounts of POP (10, 30, 50, and 100 %) as polyester polyol parts were prepared. It was found that mechanical properties including tensile strength: 3500 KPa, elongation at break%: 350% and soundproofing properties with acoustic activity of 0.72 were obtained when the POP content of the MPUF was fixed at 30%. The cell-opening behavior of POP in polyester-based MPUF was studied using SEM. It was found that the average of the open cells’ size and their population were increased as the POP content increased. Such MPUFs can be effective in successful mechanical and acoustic damping in the automotive industry.

中文翻译：

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苯乙烯接枝聚酯多元醇开孔微孔聚氨酯泡沫的隔音性能

隔音和机械强度都对隔音材料提出了重大挑战。在此，为了利用酯基团较高的分子间相互作用，使用聚合物接枝聚酯多元醇（POP）和饱和聚酯多元醇开发了一种隔音开孔微孔聚氨酯泡沫（MPUF）。 POP 是通过在饱和聚酯多元醇介质中将聚苯乙烯接枝到不饱和聚酯多元醇 (UNPES) 上合成的。改变苯乙烯单体和UNPES的用量，选择性能最佳的POP。 POP的成功合成得到了傅里叶变换红外光谱（FTIR）、质子核磁共振光谱（1H NMR）和凝胶渗透色谱（GPC）。通过扫描电子显微镜（SEM）和动态光散射（DLS）分析证实了直径约500 nm的所选POP的球形形态。制备了含有不同量 POP（10%、30%、50% 和 100%）作为聚酯多元醇部分的 MPUF。结果发现，当MPUF的POP含量固定为30％时，获得了包括拉伸强度：3500KPa、断裂伸长率％：350％和声活性为0.72的隔音性能的机械性能。使用 SEM 研究了 POP 在聚酯基 MPUF 中的开孔行为。结果发现，随着 POP 含量的增加，开孔的平均尺寸及其数量也增加。此类 MPUF 可在汽车行业中有效地实现机械和声学阻尼。