Fabrication of Millable Polyurethane Elastomer/Eucommia Ulmoides Rubber Composites with Superior Sound Absorption Performance

Sound absorbing materials combining millable polyurethane elastomer (MPU) and eucommia ulmoides rubber (EUG) were successfully fabricated via a physical blending process of EUG and MPU. The microstructure, crystallization performances, damping, mechanical and sound absorption properties of the prepa...

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Bibliographic Details
Published in:Materials 2021-12, Vol.14 (23), p.7487
Main Authors: Dong, Yuhang, Yin, Dexian, Deng, Linhui, Cao, Renwei, Hu, Shikai, Zhao, Xiuying, Liu, Li
Format: Article
Language:English
Subjects:
Absorbers (materials)
Absorptivity
Acoustic absorption
Composite materials
Crystallization
Damping
Deformation
Elastomers
Frequency ranges
Mechanical properties
Microstructure
Noise control
Noise pollution
Polyurethane resins
Rubber
Scanning electron microscopy
Sound
Sound transmission
Storage modulus
Vibration
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Summary:Sound absorbing materials combining millable polyurethane elastomer (MPU) and eucommia ulmoides rubber (EUG) were successfully fabricated via a physical blending process of EUG and MPU. The microstructure, crystallization performances, damping, mechanical and sound absorption properties of the prepared MPU/EUG composites were investigated systematically. The microstructure surface of various MPU/EUG composites became rough and cracked by the gradual incorporation of EUG, resulting in a deteriorated compatibility between EUG and MPU. With the increase of EUG content, the storage modulus (E') of various MPU/EUG composites increased in a temperature range of -50 °C to 40 °C and their loss factor (tanδ) decreased significantly, including a reduction of the tanδ of MPU/EUG (70/30) composites from 0.79 to 0.64. Specifically, the addition of EUG sharply improved the sound absorption performances of various MPU/EUG composites in a frequency range of 4.5 kHz-8 kHz. Compared with that of pure MPU, the sound absorption coefficient of the MPU/EUG (70/30) composite increased 52.2% at a pressure of 0.1 MPa and 16.8% at a pressure of 4 MPa, indicating its outstanding sound absorption properties.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14237487