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Materials 2017, 10(5), 545; doi:10.3390/ma10050545

Effect of Graphite Nanoplate Morphology on the Dispersion and Physical Properties of Polycarbonate Based Composites

1
Leibniz Institute of Polymer Research Dresden (IPF), Hohe Str. 6, 01069 Dresden, Germany
2
Fraunhofer Institute for Structural Durability and System Reliability (LBF), Schlossgartenstraße 6, 64289 Darmstadt, Germany
3
Institute of Construction Materials, Technische Universität Dresden (TUD), Georg-Schumann-Straße 7, 01187 Dresden, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 12 April 2017 / Revised: 11 May 2017 / Accepted: 12 May 2017 / Published: 18 May 2017
(This article belongs to the Section Advanced Composites)

Abstract

The influence of the morphology of industrial graphite nanoplate (GNP) materials on their dispersion in polycarbonate (PC) is studied. Three GNP morphology types were identified, namely lamellar, fragmented or compact structure. The dispersion evolution of all GNP types in PC is similar with varying melt temperature, screw speed, or mixing time during melt mixing. Increased shear stress reduces the size of GNP primary structures, whereby the GNP aspect ratio decreases. A significant GNP exfoliation to individual or few graphene layers could not be achieved under the selected melt mixing conditions. The resulting GNP macrodispersion depends on the individual GNP morphology, particle sizes and bulk density and is clearly reflected in the composite’s electrical, thermal, mechanical, and gas barrier properties. Based on a comparison with carbon nanotubes (CNT) and carbon black (CB), CNT are recommended in regard to electrical conductivity, whereas, for thermal conductive or gas barrier application, GNP is preferred. View Full-Text
Keywords: polymer-matrix composites (PMCs); graphite nanoplates; electrical; thermal and mechanical properties; melt compounding; dispersion polymer-matrix composites (PMCs); graphite nanoplates; electrical; thermal and mechanical properties; melt compounding; dispersion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Müller, M.T.; Hilarius, K.; Liebscher, M.; Lellinger, D.; Alig, I.; Pötschke, P. Effect of Graphite Nanoplate Morphology on the Dispersion and Physical Properties of Polycarbonate Based Composites. Materials 2017, 10, 545.

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