Rigid polyurethane foam is a common sound absorption material in the construction owing to its structure that can effectively absorb sound waves by air friction and structural vibration. Windmill palm fibers pretreated with acid, alkali, or steam explosion were employed with polyurethane foam to improve foam acoustic performance in this study. The open porosity of the composite foam is closely related to the different treatments of windmill palm fiber and the content of windmill palm fiber in the composite. Steam explosion treatment removes silicon and wax layers on the surface of the windmill palm fiber, and the increased surface area after steam explosion provides a number of possible coupling reaction sites between the fiber and matrix. The model calculation shows that high airflow resistivity leads to high acoustic property, which is approach with the experimental results. The peak value of acoustic property indicated that the optimal content of windmill palm fiber in the rigid polyurethane foams is 1 wt%.

中文翻译：

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风车棕榈纤维作为填充剂的蒸汽爆炸，以改善硬质聚氨酯泡沫的声学性能

硬质聚氨酯泡沫由于其结构可以有效地通过空气摩擦和结构振动吸收声波，因此是建筑中常见的吸声材料。在这项研究中，将经过酸，碱或蒸汽爆炸预处理的风车棕榈纤维与聚氨酯泡沫一起使用，以改善泡沫的声学性能。复合泡沫的开孔率与风车棕榈纤维的不同处理方法以及复合物中风车棕榈纤维的含量密切相关。蒸汽爆炸处理可去除风车棕榈纤维表面上的硅和蜡层，蒸汽爆炸后增加的表面积可在纤维与基质之间提供许多可能的偶联反应位点。模型计算表明，较高的气流阻力导致较高的声学特性，这是与实验结果相吻合的方法。声学特性的峰值表明，硬质聚氨酯泡沫中风车棕榈纤维的最佳含量为1 wt％。