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

M. Chapartegui; N. Markaide; S. Florez; C. Elizetxea; M. Fernandez; A. Santamaría

doi:10.1016/j.compscitech.2010.02.008

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

M. Chapartegui^*, N. Markaide, S. Florez, C. Elizetxea, M. Fernandez, A. Santamaría

^*Corresponding author for this work

Sustainable and functional polymers

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

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.

Original language	English
Pages (from-to)	879-884
Number of pages	6
Journal	Composites Science and Technology
Volume	70
Issue number	5
DOIs	https://doi.org/10.1016/j.compscitech.2010.02.008
Publication status	Published - May 2010

Keywords

A. Carbon nanotubes
A. Nanocomposites
B. Electrical properties
D. Rheology
Epoxy

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10.1016/j.compscitech.2010.02.008

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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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author = "M. Chapartegui and N. Markaide and S. Florez and C. Elizetxea and M. Fernandez and A. Santamar{\'i}a",

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AU - Chapartegui, M.

AU - Markaide, N.

AU - Florez, S.

AU - Elizetxea, C.

AU - Fernandez, M.

AU - Santamaría, A.

PY - 2010/5

Y1 - 2010/5

N2 - 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.

AB - 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.

KW - A. Carbon nanotubes

KW - A. Nanocomposites

KW - B. Electrical properties

KW - D. Rheology

KW - Epoxy

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DO - 10.1016/j.compscitech.2010.02.008

M3 - Article

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SN - 0266-3538

VL - 70

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EP - 884

JO - Composites Science and Technology

JF - Composites Science and Technology

IS - 5

ER -

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

Abstract

Keywords

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