材料科学
气凝胶
羧甲基纤维素
复合材料
剥脱关节
热塑性聚氨酯
降噪系数
聚氨酯
复合数
吸收(声学)
蒙脱石
多孔性
衰减系数
石墨烯
纳米技术
弹性体
物理
冶金
钠
量子力学
作者
Yinying Duan,Ke Xue,Zhuolin Shi,Ruan Tao,Feng You,Danfeng Zhou,Xueliang Jiang,Huan Yang
标识
DOI:10.1016/j.mtcomm.2024.109183
摘要
Carboxymethyl cellulose (CMC) aerogel could be used in the manufacture of highly efficient sound-absorbing materials because of its low density and sustainability. However, owing to its low mechanical strength and brittleness, preparing porous sound absorption materials with excellent sound absorption performance has always been a challenging problem. Herein, carboxymethyl cellulose/organic exfoliation of montmorillonite/thermoplastic polyurethane (CMC/OMMT/TPU) composite aerogels were successfully obtained via a simple impregnation and freeze-drying process. The effect of TPU and OMMT on the sound absorption properties of cellulose aerogels was detailedly discussed. The results revealed that the CMC/OMMT/TPU composite aerogel had hierarchically porous structures, and the sound absorption performance was significantly improved. The average sound absorption coefficient of CMC/OMMT/TPU composite aerogel could reach as high as 0.807 (500-6500 Hz). The main reason for this improvement is caused by the multiple scattering of sound waves on the arranged porous surface, as well as the viscous damping of the air inside the structure between the TPU, CMC and OMMT. Furthermore, the dimensional stability of the prepared aerogel is also greatly enhanced after using TPU. This work provides a new approach for the development of aerogel with stable morphology and sound absorption performance, which would be widely used in construction and military fields.
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