Startseite Carbon Nanotube Conductive Networks through the Double Percolation Concept in Polymer Systems
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Carbon Nanotube Conductive Networks through the Double Percolation Concept in Polymer Systems

  • S. Abbasi , A. Derdouri und P. J. Carreau
Veröffentlicht/Copyright: 1. März 2014
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International Polymer Processing
Aus der Zeitschrift International Polymer Processing Band 29 Heft 1

Abstract

We investigated the electrical conductivity and percolation behavior of binary and ternary nanocomposites based on multiwalled carbon nanotubes (MWCNs) using polypropylene (PP) and a blend of PP with cyclic butylene terephthalate (CBT). The nanocomposites were prepared by diluting a commercial 20 %wtMWCNT PP masterbatch using optimized melt-mixing conditions. The concentration of carbon nanotubes in the diluted PP samples was as low as 0.5 % and as high as 15 % in weight. For the PP/CBT blend CBT concentration was varied up to 40 %wt while the loading of CNT was from 0 to 5 %wt. SEM and TEM techniques were used to examine the quality of the dispersion and the formation of nanotube networks within the polymer matrix. TEM and Raman spectroscopy results showed that for the diluted PP/MWCNT composites the nanotubes are well aligned in samples obtained the microinjection molding process, although the level of alignment is less with crystalline PP than in an amorphous matrix such as polycarbonate (PC). FTIR and XRD results revealed that the orientation of both polymer chains and crystals decreased with the incorporation of nanotubes into PP. The electrical conductivity was also significantly altered by the nanotube alignment in a PP matrix, as was previously observed for PC/MWCNT composites; the conductivity decreased and the percolation threshold rose in highly sheared samples; however, the presence of a crystalline phase improved the conductivity even for high shear conditions through the phenomenon of double percolation threshold. This last concept refers to the requirement that the filler-rich phase be continuous and conductive and not to the existence of two percolation thresholds at two different CNT concentrations. The electrical conductivity of PP/CBT blends was also improved through a double percolation that is the basic requirement for the conductivity of the ternary nanocomposites.

* Mail address: Pierre J. Carreau, Department of Chemical Engineering, Ecole Polytechnique, Montreal, QC, Canada E-mail:

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Received: 2013-03-05
Accepted: 2013-10-06
Published Online: 2014-03-01
Published in Print: 2014-03-28

© 2014, Carl Hanser Verlag, Munich

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Invited Articles
  4. The Effect of Molecular Parameters on the Thermal Behavior of Recycled and Virgin Polyamides and Their Glass Fiber Composites
  5. Carbon Nanotube Conductive Networks through the Double Percolation Concept in Polymer Systems
  6. Application of the Experimental Results to the Modified Halpin-Tsai Micromechanical Model to Evaluate the Clay Dispersion in Clay-Reinforced Polyethylene Nanocomposites
  7. Influence of Solvent Washing and Soxhlet Extraction on the Thermal Stability of Organically Modified Layered Silicates
  8. Effect of Screw Rotation Speed on the Properties of Polycarbonate/Vapor-Grown Carbon Fiber Composites Prepared by Melt Compounding
  9. Simulation of Co-Rotating Twin Screw Extrusion Process Subject to Pressure-Dependent Wall Slip at Barrel and Screw Surfaces: 3D FEM Analysis for Combinations of Forward- and Reverse-Conveying Screw Elements
  10. Preparation of Polymer-Clay Nanocomposites by Melt Mixing in a Twin Screw Extruder: Using On-Line SAOS Rheometry to Assess the Level of Dispersion
  11. Residence Time Distribution in a High Shear Twin Screw Extruder
  12. PVDF/Carbonnanotubes/Nanoclay Composites for Piezoelectric Applications
  13. Viscoelastic and Electrical Properties of Carbon Nanotubes Filled Poly(butylene succinate)
  14. Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends
  15. Effects of Polymer Viscosity and Nanofillers on Morphology of Nanofibers Obtained by a Gas Jet Method
  16. Modeling of the Torque Requirements for the Mixing and Dispersion of Silica into Rubber
  17. High Shear Processing of (PP/EPR)/Silica Nanocomposites: Improvement of Morphology and Properties
  18. An Overview of Molten Polymer Drawing Instabilities
  19. PPS News
  20. PPS News
  21. Seikei-Kakou Abstracts
  22. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.2778

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Invited Articles
  4. The Effect of Molecular Parameters on the Thermal Behavior of Recycled and Virgin Polyamides and Their Glass Fiber Composites
  5. Carbon Nanotube Conductive Networks through the Double Percolation Concept in Polymer Systems
  6. Application of the Experimental Results to the Modified Halpin-Tsai Micromechanical Model to Evaluate the Clay Dispersion in Clay-Reinforced Polyethylene Nanocomposites
  7. Influence of Solvent Washing and Soxhlet Extraction on the Thermal Stability of Organically Modified Layered Silicates
  8. Effect of Screw Rotation Speed on the Properties of Polycarbonate/Vapor-Grown Carbon Fiber Composites Prepared by Melt Compounding
  9. Simulation of Co-Rotating Twin Screw Extrusion Process Subject to Pressure-Dependent Wall Slip at Barrel and Screw Surfaces: 3D FEM Analysis for Combinations of Forward- and Reverse-Conveying Screw Elements
  10. Preparation of Polymer-Clay Nanocomposites by Melt Mixing in a Twin Screw Extruder: Using On-Line SAOS Rheometry to Assess the Level of Dispersion
  11. Residence Time Distribution in a High Shear Twin Screw Extruder
  12. PVDF/Carbonnanotubes/Nanoclay Composites for Piezoelectric Applications
  13. Viscoelastic and Electrical Properties of Carbon Nanotubes Filled Poly(butylene succinate)
  14. Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends
  15. Effects of Polymer Viscosity and Nanofillers on Morphology of Nanofibers Obtained by a Gas Jet Method
  16. Modeling of the Torque Requirements for the Mixing and Dispersion of Silica into Rubber
  17. High Shear Processing of (PP/EPR)/Silica Nanocomposites: Improvement of Morphology and Properties
  18. An Overview of Molten Polymer Drawing Instabilities
  19. PPS News
  20. PPS News
  21. Seikei-Kakou Abstracts
  22. Seikei-Kakou Abstracts
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