4.7 Article

Specific rheological and electrical features of carbon nanotube dispersions in an epoxy matrix

Journal

COMPOSITES SCIENCE AND TECHNOLOGY
Volume 70, Issue 5, Pages 879-884

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2010.02.008

Keywords

Nanocomposites; Epoxy; Carbon nanotubes; Rheology; Electrical properties

Funding

  1. MEC (Spanish Government) [MAT2007-62151]
  2. Basque Government [GIC 07/135-IT-284-07, BFI07.274-AE]

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The rheological analysis of epoxy pre-polymer/MWCNT dispersions indicates that a physical network is formed This is destroyed with an imposed shear, giving a viscoplastic and shear thinning behavior Such destruction is not reflected in dynamic viscoelastic experiments, due to the very rapid recovery of the MWCNT network in the pre-polymer matrix. This responds to the observed lower electrical than theological percolation threshold Electrical conductivity results fulfill electron hopping/tunnelling mechanism, which implies a tube-tube distance close to 5 nm However, theological percolation requires nanotubes should touch each other, since no polymer chains are implied in the network (C) 2010 Elsevier Ltd All rights reserved

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