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Fatigue-resistant polyimide aerogels with hierarchical cellular structure for broadband frequency sound absorption and thermal insulation

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Abstract

Living in the noisy environment for long time would cause various diseases and seriously harm physical and mental health of mankind. In this work, water-soluble polyamide acid was used to prepare the polyimide-polyvinylpyrrolidone (PI-PVP) aerogels with hierarchical cellular structures by homogeneous mixing with pore modifier of PVP, freeze-drying, and thermal treatment. PVP could adjust pore structures, widen pore size distribution, and improve sound absorption performances for PI aerogels in wide frequency range. When the amount of PVP is 45 wt%, PI-PVP aerogels exhibit excellent sound absorption, mechanical, thermal insulation, and heat resistances performance. The noise reduction coefficient is 0.34 and average sound absorption coefficient is over 0.9 in the frequency range of 2000 ~ 6300 Hz. Young’s modulus is 7.12 kPa. Stress loss and plastic deformation after 100 compression cycles (strain of 50%) are 14.7% and 3.2%, respectively. Meantime, the thermal conductivity coefficient and the initial thermal decomposition temperature in the air are 0.044 W/(m·K) and 420 °C, respectively. Our fabricated PI-PVP aerogels in this work own broad application prospects in the fields of engineering, construction, vehicle noise reduction, and personal protection.

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Sound absorption performance and mechanism of PI-PVP aerogels.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

The authors are grateful for the supports from the National Natural Science Foundation of China (52203100). Open Fund for Defence Science and Technology Key Laboratory (WDZC-HGD-2022-09). This work was also financially supported by the Polymer Electromagnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars. We would also like to thank the Analytical & Testing Center of Northwestern Polytechnical University for SEM and TGA tests.

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  1. Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, People’s Republic of China

    Xingyu Zhao, Kunpeng Ruan, Hua Qiu, Xiao Zhong & Junwei Gu

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  1. Xingyu Zhao
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  2. Kunpeng Ruan
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  3. Hua Qiu
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Contributions

Xingyu Zhao: conceptualization, methodology, data curation, writing—original draft, project administration; Kunpeng Ruan: methodology, data curation; Hua Qiu: conceptualization; Xiao Zhong: writing—review and editing, conceptualization, supervision; Junwei Gu: conceptualization, supervision, project administration, writing—review and editing.

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Correspondence to Xiao Zhong or Junwei Gu.

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Zhao, X., Ruan, K., Qiu, H. et al. Fatigue-resistant polyimide aerogels with hierarchical cellular structure for broadband frequency sound absorption and thermal insulation. Adv Compos Hybrid Mater 6, 171 (2023). https://doi.org/10.1007/s42114-023-00747-9

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