Layered Structural PBAT Composite Foams for Efficient Electromagnetic Interference Shielding

A layered segregated shielding network was organized in porous PBAT/Fe 3 O 4 @MWCNTs/Ag composite by scCO 2 foaming and scraping techniques. The composite foam achieved an electromagnetic interference (EMI) shielding effectiveness (SE) of up to 68.0 dB and a reflectivity of as low as 23% due to the “absorption-reflection-re-absorption” shielding mechanism. The solid and foamed PBAT/Fe 3 O 4 @MWCNTs/Ag composites displayed superior retention (> 92%) of EMI SE even after peeling experiment of 500 times under 100 g weight pressure.