Facile and economical fabrication of conductive polyamide 6 composites with segregated expanded graphite networks for efficient electromagnetic interference shielding

摘要

AbstractAn efficient electromagnetic interference (EMI) shielding composite based on economical expanded graphite (EG) and polyamide 6 (PA6) was fabricated by a facial strategy in this work. A typical segregated structure was constructed by conventional mechanical mixing and hot pressing. EG sheets were selectively located at the boundary between PA6 regions, and thus constructed a well-connected segregate EG conductive network in the composite. Owing to the advantage of segregated network structure, EG effectively improved the EMI shielding effectiveness (SE) of PA6 at fairly low content. The effective EMI SE of 25 dB was achieved at 2.27 vol% EG loading. This result indicated the segregated PA6/EG composite can serve as an economical material for EMI shielding application.