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Fast, non-carbonized, ambient-drying PVA/CNF@GO foam: Towards super-broadband microwave absorption and structural strength enhancement in aramid honeycomb.
- Source :
-
Chemical Engineering Journal . Jun2024, Vol. 489, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- • PVA/CNF@14GO filled honeycomb composites at 30 mm achieve a broadband effective absorption performance of 13.25 GHz. • Honeycomb composites allows for broadband microwave absorption and enhanced structural strength. • The electromagnetic parameters of honeycomb composites can be precisely controlled. • The honeycomb composites were expected to be used for aviation stealth based on the light weight and broadband performance. Lightweight structural/microwave absorption (MA) integrated materials with broadband MA are urgently needed in the aerospace field. In this study, crosslinked PVA/CNF backbone-supported RGO foams were successfully filled into aramid honeycomb structures with significant broadband MA performance and structural enhancement properties through a synergistic strategy of chemical crosslinking, environmental drying and chemical vapor reduction. Flexible tuning of the electromagnetic parameters of the PVA/CNF@GO foam can be achieved by adjusting the number of GO parts. The 30 mm thickness of the PVA/CNF@14GO foam achieves a broadband effective absorption of 13.25 GHz, covering almost all C, X and Ku bands. Microstructural characterization and electromagnetic parameter tests proved that the uniform distribution of RGO was achieved with crosslinked PVA/CNF as the backbone, which resulted in less Debye relaxation and the construction of uniform conductive pathways. Therefore, the PVA/CNF@14GO-filled honeycomb not only enables the composite honeycomb to achieve broadband MA performance, but also achieves a compressive strength of 5.52 MPa, which is an improvement of 262.86 % with respect to that of the pure honeycomb. The obvious overlap of the CST power loss distribution and the electric field distribution region shows that the conductive loss and the 1/4 wavelength interference are the main paths for energy dissipation in the composite of the PVA/CNF@GO-filled honeycomb. The honeycomb-filled PVA/CNF@GO lightweight foams obtained in this chapter have good broadband microwave absorption properties and higher structural strength, which provide important design strategies and practical references for the development of high-performance MA-filled honeycomb structures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 489
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 177199123
- Full Text :
- https://doi.org/10.1016/j.cej.2024.151385