The upcycle of waste asphalt concrete toward highly efficient microwave absorbing and flame-retarding composites.
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| Title: | The upcycle of waste asphalt concrete toward highly efficient microwave absorbing and flame-retarding composites. |
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| Authors: | Fang, Hang-Ping1 (AUTHOR), Chen, Bing-Bing1 (AUTHOR), Li, Yi-Ran1 (AUTHOR), Deng, Yao1 (AUTHOR), Li, Ying-Ming1 (AUTHOR) 990201900048@cqjtu.edu.cn, Wang, De-Yi1,2,3 (AUTHOR) deyi.wang@imdea.org |
| Source: | Ceramics International. Sep2025:Part A, Vol. 51 Issue 23, p38436-38447. 12p. |
| Subjects: | Microwave attenuation, Carbon nanotubes, Electromagnetic interference, Sustainable chemistry, Asphalt pavement recycling, Pyrolysis, Waste recycling, Fire resistant polymers |
| Abstract: | It is an innovative and environment-friendly way to design high-performance microwave absorbents from the wastes to respond the chanlleges of depletion of global fossil energy and serious electromagnetic pollution. In this study, a new type of absorber (Co/CNT@PCA) was designed through the co-pyrolysis of recycled asphalt and zeolitic imidazolate framework (ZIF-67) at high-temperatures, in which PCA referring to a porous carbon matrix via the pyrolysis of waste asphalt, while Co/CNT representing the in-situ growth of carbon nanotubes (CNT) via the cobalt species-catalyzed pyrolysis of ZIF-67. When 30 wt% of the Co/CNT@PCA was added to a paraffin matrix, a minimum reflection loss (RL) of −36.3 dB was achieved with an effective absorption bandwidth (EAB) of 1.8 GHz at a thickness of 5.5 mm. The superior electromagnetic wave absorption performance was attributed to interface polarization losses and dipolar polarization induced by the multidimensional heterogeneous structure, as well as conductive losses stemming from the carbon structure. Furthermore, when 10 wt% of Co/CNT@PCA was incorporated into epoxy resin (EP), the heat release capacity (HRC) and peak heat release rate (PHRR) were reduced by 52.6 % and 52.5 % comparing to that of EP, respectively, showing a good fire safety. This work provided a new perspective for the synthesis of green and efficient microwave absorbents through the recycling and utilization of waste asphalt. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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