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Rheological and electrical properties of EVA copolymer filled with bamboo charcoal

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Abstract

The electrical and rheological properties of an ethylene vinyl acetate (EVA) copolymer filled with bamboo charcoal were investigated. The composites were prepared by melt process in an internal batch mixer. Size distribution analysis showed that d(50) and d(90) values of the bamboo charcoal particles are 12.7 and 40 μm, respectively, with a mean diameter of 22 μm. Scanning electron microscopy proved that the particles of bamboo charcoal present a rectangular shape. The electrical percolation threshold was observed at 0.18 volume fraction (35 wt%) of bamboo. Beyond the percolation threshold, a considerable increase in electrical properties was observed up to a limit value of 10-2 S/m. The rheological percolation was studied from different rheological models. As a result, the rheological percolation threshold was observed at 0.3 volume fraction (50 wt%) of bamboo charcoal contents. So, the electrical percolation occurs before the rheological percolation. This is principally due to the filler’s characteristics such as the specific surface area, the aspect ratio, and the surface properties. Finally, the bamboo charcoal confers high electrical properties to the EVA composite without inducing strong changes in its viscoelastic properties.

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Acknowledgments

Bamboo charcoal particles have been kindly supplied by the company “Bamboo Fibers Technology” (Lahontan, France). The authors would like to thank the “Centre Technologique des Microstructures” of the University Lyon 1 (France).

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Authors and Affiliations

  1. Université de Lyon, 69003, Lyon, France

    Sofiane Belaïd, Gisèle Boiteux & Philippe Cassagnau

  2. CNRS UMR 5223, Ingénierie des Matériaux Polymères, Université de Lyon 1, 15 Boulevard A. Latarjet, 69622, Villeurbanne, France

    Sofiane Belaïd, Gisèle Boiteux & Philippe Cassagnau

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  1. Sofiane Belaïd
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  2. Gisèle Boiteux
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  3. Philippe Cassagnau
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Correspondence to Philippe Cassagnau.

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Belaïd, S., Boiteux, G. & Cassagnau, P. Rheological and electrical properties of EVA copolymer filled with bamboo charcoal. Rheol Acta 52, 75–84 (2013). https://doi.org/10.1007/s00397-012-0669-z

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  • DOI: https://doi.org/10.1007/s00397-012-0669-z

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