Magnetic aligned Fe3O4-reduced graphene oxide/waterborne polyurethane composites with controllable structure for high microwave absorption capacity

Fe3O4-reduced graphene oxide (FRGO)/waterborne polyurethane (WPU) composites with controllable structure and high microwave absorption capacity were developed. The aligned structure of FRGO in the FRGO/WPU composites was realized by a magnetic-field-induced method. WPU dispersion with nano-scaled pa...

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Bibliographic Details
Published in:Carbon (New York) 2019-11, Vol.152, p.661-670
Main Authors: Dai, Mengwei, Zhai, Yinghao, Wu, Lei, Zhang, Yong
Format: Article
Language:English
Subjects:
Alignment
Complex permittivity
Composite materials
Dielectric loss
Graphene
Iron oxides
Microwave absorption
Permittivity
Polymer matrix composites
Polyurethane
Polyurethane resins
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Summary:Fe3O4-reduced graphene oxide (FRGO)/waterborne polyurethane (WPU) composites with controllable structure and high microwave absorption capacity were developed. The aligned structure of FRGO in the FRGO/WPU composites was realized by a magnetic-field-induced method. WPU dispersion with nano-scaled particles could suppress the aggregation of FRGO during the drying process. The FRGO/WPU composites have much high complex permittivity, dielectric loss tangent, and microwave absorption capacity owing to the magnetic alignment. WPU with 2% FRGO achieved the minimum reflection loss value of −67.8 dB, which can be attributed to the orientation and three-dimensional structure of FRGO. The effective bandwidth wider than 14 GHz can be reached by a combination of two layers of composites with different permittivity through theoretical calculation. The aligned FRGO/WPU composites have a great future in the application of microwave absorption materials. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.05.067