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Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

极端湿热环境下隔热的超疏水聚偏氟乙烯/聚酰 亚胺纳米纤维复合气凝胶

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Abstract

Excellent thermal insulating materials are highly demanded in various applications including buildings, aerospace and sport equipment. However, in practical applications, the performance of thermal insulating materials usually deteriorates under diverse temperature and humidity conditions. Therefore, it is highly essential to construct a bulk material that exhibits outstanding thermal insulation performance under extremely humid and hot environment. In this work, we have conceived a green and effective strategy to fabricate a superhydrophobic and compressible polyvinylidene fluoride/polyimide (PVDF/PI) nanofiber composite aerogel via electrospinning and freeze-drying technique. Interestingly, the PVDF nanofibers and PI nanofibers function as the hydrophobic fibrous framework and mechanical support skeleton, respectively, forming a robust three-dimensional framework with good mechanical flexibility. The PVDF/PI aerogel possesses outstanding superhydrophobic feature (water contact angle of 152°) and low thermal conductivity (31.0 mW m−1 K−1) at room temperature. Significantly, even at 100% relative humidity (80°C), the PVDF/PI aerogel still exhibits a low thermal conductivity of only 48.6 mW m−1 K−1, which outperforms the majority of commercial thermal insulating materials. Therefore, the novel PVDF/PI aerogel is promising as an excellent thermal insulating material for the applications in high temperature and humid environment.

摘要

优异的隔热材料在建筑、航空航天和体育设备等领域有着 广泛的应用需求. 然而, 在实际应用中, 隔热材料在不同温度和湿度 条件下, 其性能往往会恶化. 因此, 构建在极端湿热环境下仍具有出 色的隔热性能的块状材料是非常重要的. 在本工作中, 我们构思了 一种绿色制备策略, 即通过静电纺丝和冷冻干燥技术来制备超疏 水且可压缩的聚偏氟乙烯/聚酰亚胺(PVDF/PI)纳米纤维复合气凝 胶. PVDF纳米纤维和PI纳米纤维分别充当疏水性纤维骨架和机械 支撑骨架, 形成具有良好机械柔韧性的坚固的三维框架. PVDF/PI 气凝胶在室温下具有出色的超疏水特性(水接触角为152°)和低导 热性(31.0 mW m−1 K−1). 同时, 在100%湿度(80°C)下, PVDF/PI气凝 胶仅显示出48.6 mW m−1 K−1 的低热导率, 其性能优于大多数商业 绝热材料. 因此, 新型的PVDF/PI复合气凝胶有望成为高温和高湿 环境中应用的优良隔热材料.

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Acknowledgements

The authors are grateful for the financial support from the National Natural Science Foundation of China (21674019 and 21704014), the Fundamental Research Funds for the Central Universities (2232019A3-03), the Graduate Student Innovation Fund of Donghua University (CUSF-DH-D-2019006), Shanghai Sailing Program (17YF1400200), Shanghai Municipal Education Commission (17CG33), and the Ministry of Education of the People's Republic of China (6141A0202202).

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Authors and Affiliations

Authors

Contributions

Yang F contributed to the methodology and investigation, and wrote the paper. Zhao X guided the mechanical measurements and contributed to the theoretical analysis. Xue T guided the FT-IR and DSC measurements. Xue T and Yuan S participated in the discussion. Huang Y contributed to the schematic diagrams part. Fan W contributed to the conceptualization, supervision and editing. Liu T contributed to the supervision and editing.

Corresponding authors

Correspondence to Wei Fan  (樊玮) or Tianxi Liu  (刘天西).

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Conflict of interest

The authors declare no conflict of interest.

Supplementary information

Experimental details and supporting data are available in the online version of the paper.

Fan Yang is a master student of the College of Materials Science and Engineering, Donghua University. She joined Prof. Tianxi Liu's group in 2018 and her research interest is focused on the preparation and properties of nanofiber aerogel materials.

Wei Fan is an associate professor of the College of Materials Science and Engineering, Donghua University. She received her PhD degree in macromolecular chemistry and physics from Fudan University in 2015. Her research interests include functional aerogel composites, polymer nanocomposites and electrochemical energy storage materials.

Tianxi Liu is a professor of the College of Materials Science and Engineering, Donghua University. He received his PhD degree from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences in 1998. His research interests include polymer nanocomposites, new energy materials and devices, hybrid materials, nanofibers and their composite materials.

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40843_2020_1518_MOESM1_ESM.pdf

Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

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Yang, F., Zhao, X., Xue, T. et al. Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment. Sci. China Mater. 64, 1267–1277 (2021). https://doi.org/10.1007/s40843-020-1518-4

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