Study on Preparation and Absorption Properties of Fiber-Coated Yarn Modified PVA-Based Aerogel

QIN Ai-wen, WANG Jia-le, ZHI Hao-ran, YAN Yu-hang, GUO Yang, ZHU Hong-li, LI Jun

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Plastics Science and Technology ›› 2024, Vol. 52 ›› Issue (09) : 38-44. DOI: 10.15925/j.cnki.issn1005-3360.2024.09.007
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Study on Preparation and Absorption Properties of Fiber-Coated Yarn Modified PVA-Based Aerogel

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Abstract

SiO2/PVDF and PAN/PVDF fibers were prepared by electrospinning instrument with wet spinning polyvinylidene fluoride (PVDF) fiber as the core layer and ethyl orthosilicate and polyacrylonitrile (PAN) as the skin layer, and the fiber-coated yarn was carbonized, and then added to polyvinyl alcohol (PVA) to prepare aerogel by freeze-drying. The effects of two kinds of fiber-coated yarns on compressibility properties, thermal insulation properties and electromagnetic wave absorption properties of PVA-based aerogels were studied. The results show that the addition of fiber-coated yarn can enhance the compression resistance of PVA-based aerogels, and the aerogels with PAN/PVDF coated yarns have the best compression resistance, with a compressive stress of 112.3 kPa, which is 45% higher than that of unmodified aerogels, and recovery rate can still be maintained by more than 90% after five rounds of compression rebound experiments. In addition, when the thickness of the aerogel modified by PAN/PVDF coated yarn is 1 mm, the effective absorption bandwidth is 1.08 GHz, and the maximum absorption peak reaches -40.4 dB, showing excellent electromagnetic wave absorption performance.

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Aerogel / Fiber-coated yarn / Electromagnetic wave absorption / Compression performance

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QIN Ai-wen , WANG Jia-le , ZHI Hao-ran , et al . Study on Preparation and Absorption Properties of Fiber-Coated Yarn Modified PVA-Based Aerogel. Plastics Science and Technology. 2024, 52(09): 38-44 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.09.007

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