首页|碳纳米管-聚苯胺/聚乙烯醇复合气凝胶的制备及其吸波性能

碳纳米管-聚苯胺/聚乙烯醇复合气凝胶的制备及其吸波性能

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为了获得高性能复合气凝胶吸波材料,以螺旋碳纳米管(Helical carbon nanotubes,HCNTs)和聚苯胺(Polyaniline,PANI)为吸波剂,聚乙烯醇(Polyvinyl alcohol,PVA)为基体,采用定向冷冻法和低温原位聚合法制备了高性能螺旋碳纳米管-聚苯胺/聚乙烯醇复合气凝胶(HCNTs-PANI/PVA composite aerogels,HPPA).采用扫描电子显微镜、红外光谱仪、拉曼光谱仪和X射线衍射仪对HPPA复合气凝胶的形貌与结构进行表征,并使用矢量网络分析仪测定HPPA复合气凝胶的电磁参数和吸波特性.结果表明:所制备的HPPA复合气凝胶具有优异的吸波性能,最小的反射损耗为-69.08 dB,有效吸收带宽为4.20 GHz;HPPA复合气凝胶优异的吸波性能主要归因于其定向的多孔结构和非均匀介质界面形成的良好阻抗匹配特性和多重极化协同效应.该文为构建高性能复合气凝胶吸波体系提供了新思路.
Preparation and microwave absorption properties of carbon nanotube-polyaniline/polyvinyl alcohol composite aerogels
To obtain high-performance composite aerogel absorbing materials,high-performance HCNTs-PANI/PVA composite aerogels(HPPA)were prepared by directional freezing and low-temperature in-situ polymerization with helical carbon nanotubes(HCNTs)and polyaniline(PANI)as the absorbing functional agent,and polyvinyl alcohol(PVA)as the matrix.The morphology and structure of the HPPA composite aerogels were characterized by scanning electron microscopy,infrared spectroscopy,Raman spectroscopy,and X-ray diffraction.The electromagnetic parameters and absorbing properties of the HPPA composite aerogels were analyzed by vector network analyzer.The results show that the prepared HPPA composite aerogels exhibit excellent wave absorption performance with a minimum reflection loss of-69.08 dB and effective absorption bandwidth of 4.20 GHz.The good microwave absorption performance of the HPPA composite aerogels is mainly attributed to their directional porous structure and heterogeneous medium interface to form a good impedance matching and multi-polarization synergistic effect.This study provides a new idea for the construction of the high-performance composite aerogel absorbing system.

composite aerogelsdirectional freezinglow temperature in situ polymerizationPANImicrowave absorption properties

刘德运、朱曜峰

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浙江理工大学材料科学与工程学院,杭州 310018

复合气凝胶 定向冷冻 低温原位聚合 聚苯胺 吸波性能

2024

浙江理工大学学报
浙江理工大学

浙江理工大学学报

影响因子:0.311
ISSN:1673-3851
年,卷(期):2024.51(3)