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. 2019 Aug 28;11(9):1411. doi: 10.3390/polym11091411

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Percolation threshold ( $Φ_{c}$ ) determination plot. Electrical conductivity of PET/graphite micro-composites as a function of graphite content. The inset plot is $log σ$ versus $log (Φ - Φ_{c})$ .