Abstract: The present paper mainly concerns the influence of carbon-based conductive filler’s properties on the electromagne-tic shielding effectiveness of polyvinyl butyral (PVB)/filler functional composite films. Three kinds of fillers, i.e., graphite, nickel coated graphite and silver coated carbon fiber, each of which differs in conductivity and geometrical shape, were selected as functional fillers to modify PVB resin, respectively, and consequently form a series of PVB/filler functional composite films by solution casting method. Our experiment confirmed the significant influences of the filler’s properties, including geometrical shape, density and conductivity on the microstructure and electrical performance of the composites. It was found that fibrous filler more easily lap into a conductive network. Scanning electron microscope (SEM) observation revealed that fillers were distributed more uniformly in PVB matrix in both the graphite and silver coated carbon fiber composite system. However, the nickel coated graphite formed a gradient distribution inside the composite. The difference in distribution structure leads to the discrepancy of the electrically conductive performance between the top and bottom surface of the film and brings varying electromagnetic shielding effectiveness. Under the same filler volume content, the electromagnetic shielding effectiveness of the composite mainly depends on the conductivity of the material. Among the three composites, the PVB/silver coated carbon fiber system and the PVB/graphite system have the highest and the lowest electromagnetic shielding effectiveness, respectively, and the PVB/nickel coated graphite holds a medium between the former two composites.
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2018, Vol. 32 
