Morphology-controllable synthesis of polyurethane-derived highly cross-linked 3D networks for multifunctional and efficient electromagnetic wave absorption
| Autor: | Xiaojie Zhu, Zhen Xiang, Zhong Shi, Wei Lu, Fei Pan, Lei Cai, Xiang Zhang, Yanyan Dong |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Attenuation Reflection loss Impedance matching 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Thermal insulation Thermal General Materials Science Composite material 0210 nano-technology Absorption (electromagnetic radiation) business Microwave Polyurethane |
| Zdroj: | Carbon. 182:254-264 |
| ISSN: | 0008-6223 |
| Popis: | The morphology modulation of multi-level structures and the multifunctional design of their composites are challenging research priorities in the field of electromagnetic wave absorption. In this work, the abandoned polyurethane is adopted as a sacrificial template of a three-dimensional carbon network. The morphology-controlled Fe/Fe2O3@porous carbon composites with highly cross-linked 3D structures are synthesized by simple hydrothermal and thermal treatments. Among them, the PM-700 with a coral-like structure has a minimum reflection loss of −54.7 dB at a thickness of 1.4 mm and an effective absorption bandwidth of 6.4 GHz (10.8–18 GHz) at 1.9 mm. The excellent absorption performance is attributed to the three-dimensional magnetic conductive network, which provides superior impedance matching, synergistic effects of dual-loss mechanisms, and multiple attenuation. Furthermore, benefiting from its unique three-dimensional structure, the PM-700 possesses low density (0.088 g/cm3), excellent mechanical properties (withstand more than 4000 times of its own weight), and high thermal management (thermal insulation and flame retardancy). Meanwhile, PM-700 exhibits excellent infrared stealth performance, which is conducive to the development of multi-band compatible stealth materials. This work not only contributes to the conservation of resources and reuse of wasted polyurethane, but also facilitates the multifunctional application of microwave absorbing materials with multi-level structures. |
| Databáze: | OpenAIRE |
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