Polypropylene-based conducting nanocomposites: Effect of aspect ratio of second conducting filler on the electrical percolation
01 Jun 2017-Journal of Thermoplastic Composite Materials (SAGE PublicationsSage UK: London, England)-Vol. 30, Iss: 6, pp 0892705715614063
TL;DR: In this article, the electrical percolation threshold of powder-mixed polypropylene (PP) and graphite binary composites was found to have inverse relation to the aspect ratio of second conducting fillers in hybrid composites.
Abstract: Powder-mixed polypropylene (PP)–graphite binary composites exhibit an electrical percolation threshold at 10 wt% graphite signifying insulator-semiconductor transition. Three conducting fillers such as carbon black (CB), sonicated expanded graphite (s-ExGr), and carbon nanofiber (CNF) are mixed with PP-7 wt% graphite binary composites. The electrical percolation threshold has been found to have inverse relation to the aspect ratio of second conducting fillers in hybrid composites. The aspect ratio of second conducting fillers varies in the order CB < ExGr < CNF. The electrical percolation threshold is found to vary for the hybrid composites as 2.2 wt% for CB addition, 0.75 wt% for ExGr addition, and 0.2 wt% for CNF addition in the PP-7 wt% graphite binary composites. When the aspect ratio of second conducting fillers increases, they reduce the barrier for the charge transport. The second conducting fillers occupy the interspace of graphite and alternating current studies show that the effective dielectric...
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Abstract: In this study, the role of polymer matrix molecular structure and drastically different processing method on the conduction behavior of carbon-filled polymer composites was investigated. The electrical conductivity and percolation parameters of poly-dimethylsiloxane (PDMS elastomer) filled with carbon nanofibers (CNFs) and carbon nanotubes (CNTs) via solution mixing were first determined. Using the power law model the percolation threshold (φc) for CNF was 0.83 wt% and the critical exponent (t) was 2.86. This t value depends on the filler dimensionality and the intrinsic conducting property of the composite system; however, the conduction behavior was found to be independent on filler dimensionality at nano-scale beyond the percolation threshold. These results were applied to a much different polymer composite system of nylon-6 thermoplastic filled with CNTs prepared by extrusion method to predict its percolation behavior. The predicted φc of the nylon composite was in good agreement with our experimental value as φc-CNT,prediction = 3.02 wt% and φc-CNT,experiment = 2.96 wt%.
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TL;DR: Polyphenylene sulfide (PPS)-expanded graphite (ExGr) conducting nanocomposites have been prepared by powder mixing and in situ polymerization routes after sonicating ExGr particles in acetone.
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Cites methods from "Polypropylene-based conducting nano..."
...It has been shown for polyethersulfone (PES)-graphite-carbon black (CB) hybrid composites solution blending process results in graphite particle size reduction which results in better dispersion when compared to powder mixed hybrid composites.(20) Hence the electrical percolation threshold is reduced in the case of solution-blended PES-graphiteCB hybrid composites compared to powder mixed ones....
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References
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"Polypropylene-based conducting nano..." refers background in this paper
...Jing et al.9 have correlated aspect ratio and degree of dispersion of carbon nanotube (CNT) to the electrical percolation threshold in CNT-reinforced epoxy matrix....
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