Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels

2012 ◽  
Vol 376 (45) ◽  
pp. 3290-3294 ◽  
Author(s):  
P. Cardoso ◽  
J. Silva ◽  
J. Agostinho Moreira ◽  
D. Klosterman ◽  
F.W.J. van Hattum ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Temperature Dependence ◽  
Carbon Nanofiber ◽  
Epoxy Composites ◽  
Filler Dispersion ◽  
Vapor Grown Carbon Nanofiber

Electrical conductivity of vapor-grown carbon nanofiber/polyester textile-based composites

2013 ◽  
Vol 130 (4) ◽  
pp. 3009-3017 ◽  
Author(s):  
Niloufar Sabetzadeh ◽  
Saeed Shaikhzadeh Najar ◽  
S. Hajir Bahrami
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanofiber ◽  
Polyester Textile ◽  
Vapor Grown Carbon Nanofiber

On the origin of the electrical response of vapor grown carbon nanofiber + epoxy composites

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
J. Silva ◽  
P. Cardoso ◽  
A. J. Paleo ◽  
F. W. J. van Hattum ◽  
R. Simoes ◽  
...  
Keyword(s):  
Physical Properties ◽  
Polymer Matrix ◽  
Carbon Nanofiber ◽  
Electrical Response ◽  
Epoxy Composites ◽  
Electrical Behavior ◽  
Weak Disorder ◽  
Vapor Grown Carbon Nanofiber

AbstractThe origin of the electrical response of vapor grown carbon nanofiber (VGCNF) + epoxy composites is investigated by studying the electrical behavior of VGCNF with resin, VGCNF with hardener and cured composites, separately. It is demonstrated that the onset of the conductivity is associated to the emergence of a weak disorder regime. It is also shown that the weak disorder regime is related to a hopping depending on the physical properties of the polymer matrix.

scholarly journals The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites

2011 ◽  
Vol 6 (1) ◽  
pp. 370 ◽  
Author(s):  
Paulo Cardoso ◽  
Jaime Silva ◽  
Donald Klosterman ◽  
José A Covas ◽  
Ferrie WJ van Hattum ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Carbon Nanofiber ◽  
Epoxy Composites ◽  
Dispersion Method ◽  
Vapor Grown Carbon Nanofiber

Effect of filler dispersion on the electromechanical response of epoxy/vapor-grown carbon nanofiber composites

2012 ◽  
Vol 21 (7) ◽  
pp. 075008 ◽  
Author(s):  
A Ferreira ◽  
P Cardoso ◽  
D Klosterman ◽  
J A Covas ◽  
F W J van Hattum ◽  
...  
Keyword(s):  
Carbon Nanofiber ◽  
Filler Dispersion ◽  
Vapor Grown Carbon Nanofiber

scholarly journals Influence of Carbon Nanotube-Pretreatment on the Properties of Polydimethylsiloxane/Carbon Nanotube-Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1355
Author(s):  
Astrid Diekmann ◽  
Marvin C. V. Omelan ◽  
Ulrich Giese
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Mechanical Performance ◽  
Softening Effect ◽  
Electrical Percolation ◽  
Optimum Parameters ◽  
Lauryl Ether ◽  
Solvent Residues ◽  
Electrical Percolation Threshold ◽  
Filler Dispersion

Incorporating nanofillers into elastomers leads to composites with an enormous potential regarding their properties. Unfortunately, nanofillers tend to form agglomerates inhibiting adequate filler dispersion. Therefore, different carbon nanotube (CNT) pretreatment methods were analyzed in this study to enhance the filler dispersion in polydimethylsiloxane (PDMS)/CNT-composites. By pre-dispersing CNTs in solvents an increase in electrical conductivity could be observed within the sequence of tetrahydrofuran (THF) > acetone > chloroform. Optimization of the pre-dispersion step results in an AC conductivity of 3.2 × 10−4 S/cm at 1 Hz and 0.5 wt.% of CNTs and the electrical percolation threshold is decreased to 0.1 wt.% of CNTs. Optimum parameters imply the use of an ultrasonic finger for 60 min in THF. However, solvent residues cause a softening effect deteriorating the mechanical performance of these composites. Concerning the pretreatment of CNTs by physical functionalization, the use of surfactants (sodium dodecylbenzenesulfonate (SDBS) and polyoxyethylene lauryl ether (“Brij35”)) leads to no improvement, neither in electrical conductivity nor in mechanical properties. Chemical functionalization enhances the compatibility of PDMS and CNT but damages the carbon nanotubes due to the oxidation process so that the improvement in conductivity and reinforcement is superimposed by the CNT damage even for mild oxidation conditions.

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