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

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Advanced Composites and Hybrid Materials Pub Date : 2023-09-21 DOI:10.1007/s42114-023-00747-9

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

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引用次数: 2

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.

Graphical abstract

Sound absorption performance and mechanism of PI-PVP aerogels.

Abstract Image

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具有分层细胞结构的抗疲劳聚酰亚胺气凝胶，用于宽带频率吸声和隔热

长期生活在嘈杂的环境中会引起各种疾病，严重危害人类的身心健康。本文以水溶性聚酰胺酸为原料，通过与PVP孔改性剂均匀混合、冷冻干燥和热处理，制备了具有分层细胞结构的聚酰亚胺-聚乙烯吡罗烷酮(PI-PVP)气凝胶。PVP可以调节PI气凝胶的孔隙结构，扩大孔径分布，提高其在宽频率范围内的吸声性能。当PVP用量为45%时，PI-PVP气凝胶表现出优异的吸声、机械、隔热和耐热性能。在2000 ~ 6300 Hz的频率范围内，降噪系数为0.34，平均吸声系数大于0.9。杨氏模量为7.12 kPa。100次压缩循环(50%应变)后的应力损失和塑性变形分别为14.7%和3.2%。同时，在空气中的导热系数为0.044 W/(m·K)，初始热分解温度为420℃。本工作制备的PI-PVP气凝胶在工程、建筑、车辆降噪、个人防护等领域具有广阔的应用前景。图示:PI-PVP气凝胶的吸声性能及机理。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.