Effects of structural design including cellular structure precision controlling and sharp holes introducing on sound absorption behavior of polyimide foam |
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| Institution: | 1. School of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing, China;2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, China;1. Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Institute of Advanced Marine Materials, Harbin Engineering University, Harbin 150001, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Shanghai Key Laboratory of Spacecraft Mechanism, Shanghai 201109, China;1. School of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China;2. Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education of China, Beijing 100084, China;3. Centre for Composite Materials, International Research Centre, Kalasalingam University, Anand Nagar, Krishnankoil 626 126, India |
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| Abstract: | This paper aims to effectively improve acoustic property of polyimide foam (PIF) by regulating cellular structure of PIF on a large scale and introducing sharp hole structure simultaneously, adopting a special mold with split structure in a closed-mold foaming route. In this work, PIF with same split structure but different pore cell sizes, density, and windows opening rate were produced in the first time. Due to the stepwise transition principle, the impedance of the air acoustic medium and the acoustic material was well matched. In addition, the characterization results showed the effectively effects of microporous structure and split structure characteristics of PIF on the acoustical absorption coefficient. For PIF-4, sound absorption coefficient kept around 0.9 from 900 to 6300 Hz. Especially, the resonance sound absorption characteristics was basically eliminated, which ensured the high efficiency sound absorption behavior of PIF in the broadband range from 600 to 6300 Hz region. |
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| Keywords: | Structural design Acoustic behavior Polyimide foam Pore structure Wedge structure |
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