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Polyetherimide Foams Filled with Low Content of Graphene Nanoplatelets Prepared by scCO2 Dissolution

Centre Català del Plàstic, Departament de Ciència dels Materials i Enginyeria Metal lúrgica, Universitat Politècnica de Catalunya (UPC Barcelona Tech), C/Colom 114, E-08222 Terrassa, Barcelona, Spain
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Polymers 2019, 11(2), 328; https://doi.org/10.3390/polym11020328
Received: 8 January 2019 / Revised: 9 February 2019 / Accepted: 11 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Polymeric Foams)
Polyetherimide (PEI) foams with graphene nanoplatelets (GnP) were prepared by supercritical carbon dioxide (scCO2) dissolution. Foam precursors were prepared by melt-mixing PEI with variable amounts of ultrasonicated GnP (0.1–2.0 wt %) and foamed by one-step scCO2 foaming. While the addition of GnP did not significantly modify the cellular structure of the foams, melt-mixing and foaming induced a better dispersion of GnP throughout the foams. There were minor changes in the degradation behaviour of the foams with adding GnP. Although the residue resulting from burning increased with augmenting the amount of GnP, foams showed a slight acceleration in their primary stages of degradation with increasing GnP content. A clear increasing trend was observed for the normalized storage modulus of the foams with incrementing density. The electrical conductivity of the foams significantly improved by approximately six orders of magnitude with only adding 1.5 wt % of GnP, related to an improved dispersion of GnP through a combination of ultrasonication, melt-mixing and one-step foaming, leading to the formation of a more effective GnP conductive network. As a result of their final combined properties, PEI-GnP foams could find use in applications such as electrostatic discharge (ESD) or electromagnetic interference (EMI) shielding. View Full-Text
Keywords: polyetherimide foams; graphene; multifunctional foams; ultrasonication; scCO2; electrical conductivity polyetherimide foams; graphene; multifunctional foams; ultrasonication; scCO2; electrical conductivity
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MDPI and ACS Style

Abbasi, H.; Antunes, M.; Velasco, J.I. Polyetherimide Foams Filled with Low Content of Graphene Nanoplatelets Prepared by scCO2 Dissolution. Polymers 2019, 11, 328.

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