Article Dans Une Revue Polymer Engineering and Science Année : 2012

Rheological and electrical percolation thresholds of carbon nanotube/polymer nanocomposites

Résumé

Percolation thresholds of multiwalled carbon nanotube/polystyrene (MWCNT/PS) nanocomposites (NC) were determined by rheology and electrical conductivity. The percolation threshold found by electrical conductivity was 0.5% carbon nanotubes (CNT) and that by mechanical spectroscopy and relaxation measurements was 0.9% CNT. These results together with those reported in the literature show several types of percolation thresholds, depending on the average fillerfiller (CNT and/or aggregates) distance in a polymer matrix. A distance close to polymer gyration radius corresponds to a soft rheological threshold (PC rheosoft). Close contacts between fillers giving rise to a conductive path corresponds to an electrical threshold (PC elec). At high filler concentration, fillers form a network, corresponding to a rigid rheological threshold (PC rheorigid). These thresholds depend on the filler content and follow the order: PC elecsoft < PC elec < PC rheorigid.

Dates et versions

hal-00778389 , version 1 (19-01-2013)

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Christian Penu, Amaia Fernandez, Philippe Marchal, Guo-Hua Hu, Lionel Choplin. Rheological and electrical percolation thresholds of carbon nanotube/polymer nanocomposites. Polymer Engineering and Science, 2012, 52 (10), pp.2173-2181. ⟨10.1002/pen.23162⟩. ⟨hal-00778389⟩
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