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Structure control of the polyetherimide porous membrane and its acoustical metamaterial sound absorption and the sound insulation properties
Authors: GU Kai, ZHU Yingwen, YIN Ahen, SHE Xiaojun, WANG Kun, CUI Bo, ZHU Mengfu
Units: 1. College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China; 2. Institute of Environmental Medicine and Occupational Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Tianjin 300050, China; 3. Institute of Medical Support Technology, Academy of Military Science of Chinese PLA, Tianjin 300161, China
KeyWords: polyetherimide; porous membrane; structure control; acoustic metamaterial; sound absorption; sound insulation
ClassificationCode:TQ028;O422.4;TB535
year,volume(issue):pagination: 2023,43(5):65-73

Abstract:
  The polyetherimide (PEI) porous membrane was prepared by phase inversion process using PEI as the membrane material and N-methylpyrrolidone (NMP) as the solvent, in which the PEI porous membrane acoustic metamaterial was further constructed. The effects of PEI concentration, scraping thickness, and coagulation bath composition on the thickness, density, morphology, and tensile strength of the PEI porous membrane, as well as the sound absorption properties and sound insulation properties of the porous membrane acoustic metamaterial in the low-frequency range were investigated. The results showed that increasing the PEI concentration inhibited the formation of finger-like pore structures and increased the density of the PEI porous membrane. By increasing the membrane density, the average absorption coefficient of the porous membrane acoustic metamaterial decreased from 0.075 to 0.040, and the average sound transmission loss increased from 4.126 dB to 6.263 dB. Increasing the scraping thickness decreased the number of finger-like pores and increased the thickness of the PEI porous membrane. The average absorption coefficient of the porous membrane acoustic metamaterial decreased from 0.113 to 0.043, and the average sound transmission loss increased from 3.149 dB to 8.317 dB. The addition of NMP to the coagulation bath promoted the formation of sponge-like pore structures in the PEI porous membrane. The PEI porous membrane was basically a fully sponge-like structure with the NMP concentration of 80% (v/v). Increasing the NMP concentration increased the density and decreased the thickness of the PEI membrane. Due to the opposite effect of density and thickness, the effect of coagulation bath composition on the sound absorption properties and sound insulation properties of the porous membrane acoustic metamaterial was not obvious in the experimental frequency range.

Funds:
自主科研项目(2021ZZKY04)

AuthorIntro:
顾凯(1997-),男,安徽六安人,硕士生,主要从事膜材料制备及其声学性能研究,E-mail:861034219@qq.com.

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