Abstract
Conductive polymer composites(CPCs)have attracted significant interest in the field of flexible electro-magnetic protection,but the challenge of balancing high electromagnetic interference shielding effec-tiveness(EMI SE)and low reflection losses still exists.Herein,thermoplastic polyurethane/silver nanorod(TPU/AgNR)composite foams have been successfully prepared using both the salt template and vacuum-assisted thermal compression methods.By varying the AgNRs content and employing a layer-by-layer bonding approach,a gradient structure with optimized impedance matching is achieved.The"absorb-reflect-reabsorb"EM attenuation mechanism of the asymmetric gradient EMI shielding in the internal structure is exploited,resulting in TPU/AgNR foam(TAF)with high EMI SE and significantly reduced EM reflection.Notably,the three-layer foams exhibit an average shielding efficacy of 35.5 dB and a reflected power coefficient(R)of 0.085 in the X-band,thereby substantially mitigating secondary EM wave reflec-tions.Furthermore,these foams demonstrate exemplary compressive resilience,with the sample main-taining excellent EMI shielding stability even after undergoing 100 compression cycles at 50％strain.Consequently,a straightforward approach is employed to fabricate materials with high EMI SE and low reflectivity,offering the potential for use in EM shielding applications of next-generation flexible elec-tronic devices.
基金项目
National Natural Science Foundation of China(52273085)
National Natural Science Foundation of China(52303113)
Natural Science Foundation of China of Henan Province(222300420541)
Key Scientific Research Projects of Colleges and Universities in Henan Province,China(24A430045)
NETL
NSTL
万方数据