Coal tar pitch-based hyper-crosslinked polymers derived porous carbon for electromagnetic wave absorption  

作　　者：Yaofeng Wu Geqing Zhang Chunjia Luo Xi Chen Min Chao Luke Yan 

机构地区：[1]School of Materials Science and Engineering,Chang’an University,Xi’an 710064,China

出　　处：《Nano Research》2025年第4期31-42,共12页纳米研究(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22005039);the Innovation Capability Support Program of Shaanxi(No.2023-CX-TD-43);the Fundamental Research Funds for the Central Universities,CHD(Nos.300102313208,300102312403,and 300102314401).

摘　　要：Porous carbon(PC)materials have unique structures and excellent physicochemical properties,which offer significant advantages in the field of electromagnetic wave(EMW)absorption materials.However,how to utilize available raw materials and practical preparation techniques is a major challenge for PC microwave absorption materials to achieve engineering applications.In this study,inexpensive coal tar pitch(CTP)was used as a carbon source to prepare PC microwave absorbers.Firstly,hyper-crosslinked polymers(HCPs)were prepared by selectively crosslinking the aromatic components in CTP via Friedel-Crafts reaction using chloroalkanes as crosslinking agents.Further,PC materials with uniform structure were also prepared by simple high-temperature carbonization.The effects of cross-linker type(CH_(2)Cl_(2),CHCl_(3) and CCl_(4))and carbonization temperature(600,700,and 800℃)on the microstructure,crystallization,dielectric and microwave absorption properties of PC materials were systematically studied.After modulation and optimization,all CTP-based PCs have uniform pore structure with a maximum specific surface area of 533.93 m^(2)/g.The PC with CHCl_(3) as cross-linking agent carbonized at 700℃ showed the exceptional microwave absorption performance,with the minimum refection loss(RL_(min))of−43.08 dB and the maximum effective absorption bandwidth(EAB_(max))of 5.44 GHz.Meanwhile,the RL_(min) of CCl_(4)-PC-800 also achieved−47.28 dB.This work has developed a simple and low-cost method for preparing PC microwave absorption materials,which has the potential to enable the mass production and engineering application of PCs,as well as facilitating processing technology innovation and high value-added utilization of CTP.

关 键 词：porous carbon coal tar pitch hyper-crosslinked polymers electromagnetic wave absorption 

分 类 号：TQ317[化学工程—高聚物工业]