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Injection molded microcellular PLA/graphite nanocomposite with dramatically enhanced mechanical and electrical properties for ultra-efficient EMI shielding applications

Abstract

High-performance EMI shielding materials with renewable characteristics are needed to address the issue of electromagnetic radiation pollution. Traditional metal-based EMI shielding materials are limited by their high density, corrosiveness, and expensive processing costs. At the same time, regular fossil-fuel-driven conductive polymer composite-based EMI shielding materials create environmental pollution, exacerbate resource consumption, and offer poor electromagnetic shielding effectiveness. Moreover, most of the processing methods used for conductive polymer composite-based EMI shielding materials are focused on batch-scale process, which cannot easily be scaled up. We studied a sustainable foam injection molding-based method to efficiently fabricate renewable microcellular PLA/graphite nanocomposite foams, with improved mechanical and electrical properties for use in ultra-efficient EMI shielding applications. Microcellular PLA/graphite nanocomposite foam, with a density of 0.7 g/cm3 and a thickness of 2.0 mm, had an outstanding EMI shielding performance with a total electromagnetic interference shielding effectiveness (EMI SE) of up to 45 dB. More important, thanks to the reduced reflection, which resulted from the strong thin-film interference effect, this lightweight porous nanocomposite had an absorption-dominated EMI shielding feature with a radiation energy reflectance of less than 15%. The nanographite reorientation, which resulted from the foaming, led to the microcellular PLA/graphite nanocomposite foam’s electrical conductivity being dramatically increased by almost six orders of magnitude, in relation to the unfoamed sample. Furthermore, the microcellular PLA/graphite nanocomposite foam also had outstanding mechanical properties. These were characterized by a strong specific strength and modulus, and a super-ductile fracture behavior. Thus, this lightweight sustainable nanocomposite foam demonstrated great promise as an ultra-efficient EMI shielding material for future use in many applications such as aerospace and electronics.

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Supplementary files

Publication details

The article was received on 19 Mar 2018, accepted on 06 Jun 2018 and first published on 08 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01326H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Injection molded microcellular PLA/graphite nanocomposite with dramatically enhanced mechanical and electrical properties for ultra-efficient EMI shielding applications

    G. Wang, G. Zhao, S. Wang, L. Zhang and C. B. Park, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01326H

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