The closed cell polyimide foams were fabricated by foaming the precursor balloons,and the foams’acoustic absorption properties were tested.The results show that the acoustic absorption properties of closed cell polyimide foams have the typical resonance acoustic absorption characteristic.The acoustic absorption properties of polyimide foams were researched,and the influence of thickness and density on its acoustic absorption properties were also studied,the acoustic absorption theoretics of polyimide foams was analyzed.The combination of closed cell and open cell polyimide foams can notable enhance the acoustic absorption coefficient.
Key words
polyimide foam /
acoustic absorption /
acoustic absorption /
foam thickness /
resonance acoustic a
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