Electromagnetic Interference Shielding Properties of Regenerated Cellulose Matrix Composite Films with Sandwich Structure
Electromagnetic radiation pollution has become increasingly serious in the electronic,industrial,civil and military fields.High-performance electromagnetic interference(EMI)shielding films have recently become popular research topics.In this work,the sandwich-structured graphene(GE)/regenerated cellulose(RC)-Fe3O4/RC-GE/RC composite films were fabricated by immersed phase transformation and compression molding methods using RC as matrix,GE as conductive filler and nano Fe3O4 as magnetic filler.The influence of GE contents and the thicknesses on the EMI shielding properties of the composite films were studied,and their shielding mechanism was discussed.The results showed that the conductivity and EMI shielding effectiveness(SE)were enhanced by both the increase of GE content and the film thickness.The EMI SE of the composite films reached the maximum 24.7 dB at the GE content of 20％and the film thickness of 0.84 mm.Meanwhile,the tensile strength of the composite film was enhanced by the addition of GE,with a maximum value of 12.2 Mpa.This study provides a feasible strategy to prepare cellulose-based composite films for electromagnetic shielding.
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