ABSTRACT

The aim of this study is to determine the effect of sub-micron fibre web layers on sound absorption properties when they are placed on rigid substrate and flexible substrate. Elastomeric thermoplastic polyurethane (TPU) and composite TPU/PS (polystyrene) sub-micron fibre webs with both rigid glass fibre fabric reinforced epoxy composites (GFEC) and flexible polypropylene (PP) spunbond nonwovens have been examined. Elastomeric TPU sub-micron fibres and TPU/PS fibre web before and after soxhlet extraction were studied. Even though a thin layer of (less than 1 mm) electrospun sub-micron fibres were used with GFEC, sound absorption coefficient (SAC) improved from 0.1 to 0.4. Maximum SAC is drawn back to lower frequency (from 1250 to 500–630 Hz), when sub-micron fibre web is used on nonwoven. In conclusion, the mechanism of elastomeric thin sub-micron fibre webs on sound absorption for rigid GFEC and for flexible nonwoven is totally different than each other.

摘要

本研究的目的是确定亚微米纤维网层放置在刚性基材和柔性基材上时对吸声性能的影响。弹性热塑性聚氨酯 (TPU) 和复合 TPU/PS（聚苯乙烯）亚微米纤维网与刚性玻璃纤维织物增强环氧树脂复合材料 (GFEC) 和柔性聚丙烯 (PP) 纺粘非织造布均已进行了研究。研究了索氏提取前后的弹性 TPU 亚微米纤维和 TPU/PS 纤维网。尽管 GFEC 使用了薄层（小于 1 毫米）电纺亚微米纤维，吸声系数 (SAC) 从 0.1 提高到 0.4。当亚微米纤维网用于非织造布时，最大 SAC 被拉回到较低频率（从 1250 到 500-630 Hz）。综上所述，