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The Role of Multiwalled Carbon Nanotubes in the Mechanical, Thermal, Rheological, and Electrical Properties of PP/PLA/MWCNTs Nanocomposites

1
Department of automation, production engineering, École de technologie supérieure (ETS), University of Québec, Montreal, QC H3C 1K3, Canada
2
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran 11365-11155, Iran
3
Polymer Group, Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156, Iran
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2019, 3(3), 64; https://doi.org/10.3390/jcs3030064
Received: 9 June 2019 / Revised: 23 June 2019 / Accepted: 25 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Feature Papers in Journal of Composites Science in 2019)
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Abstract

Polypropylene/polylactic acid (PP/PLA) blend (10–40% of PLA) and PP/PLA/MWCNTs nanocomposites (0.5, 1, and 2 wt% of MWCNTs) were prepared via melt compounding. Scanning electron microscopy revealed a co-continuous PLA phase in the PP/PLA blends with high PLA content. Moreover, the addition of 2 wt% multi-walled carbon nanotubes (MWCNTs) increased the tensile modulus and tensile strength of the PP/PLA40% by 60% and 95%, respectively. A conductive network was found with the addition of 2 wt% MWCNTs, where the electrical conductivity of the PP/PLA increased by nine orders of magnitude. At 2 wt% MWCNTs, a solid network within the composite was characterized by rheological assessment, where the composite turned from nonterminal to terminal behavior. Soil burial testing of the PP/PLA blend within 30 days in natural humus compost soil featured suitable biodegradation, which indicates the PP/PLA blend is as an appropriate candidate for food packing applications. View Full-Text
Keywords: blends; mechanical properties; electrical properties; additives; nanocomposites blends; mechanical properties; electrical properties; additives; nanocomposites
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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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Azizi, S.; Azizi, M.; Sabetzadeh, M. The Role of Multiwalled Carbon Nanotubes in the Mechanical, Thermal, Rheological, and Electrical Properties of PP/PLA/MWCNTs Nanocomposites. J. Compos. Sci. 2019, 3, 64.

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