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

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URI: https://hdl.handle.net/11556/4118
ISSN: 0266-3538
DOI: 10.1016/j.compscitech.2010.02.008
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2010-05
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Abstract
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 rheological percolation threshold. Electrical conductivity results fulfill electron hopping/tunnelling mechanism, which implies a tube-tube distance close to 5. nm. However, rheological percolation requires nanotubes should touch each other, since no polymer chains are implied in the network.
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A. Carbon nanotubes , A. Nanocomposites , B. Electrical properties , D. Rheology , Epoxy , Ceramics and Composites , General Engineering
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journal article
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Chapartegui , M , Markaide , N , Florez , S , Elizetxea , C , Fernandez , M & Santamaría , A 2010 , ' Specific rheological and electrical features of carbon nanotube dispersions in an epoxy matrix ' , Composites Science and Technology , vol. 70 , no. 5 , pp. 879-884 . https://doi.org/10.1016/j.compscitech.2010.02.008