Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures

D Xiang, L Wang, Y Tang, C Zhao, E Harkin-Jones, Y Li

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Abstract

Multi-walled carbon nanotube (MWCNT)- and graphene nanoplatelet (GNP)-filled high-density polyethylene (HDPE) composites with dispersed and segregated network structures were prepared by solution-assisted mixing. Simultaneous DC conductivity and differential scanning calorimetry were used to measure electrical conductivity during composite thermal phase transitions.It was found that the conductive network is deformed during melting and rebuilt again during annealing due to there-agglomeration of nanofillers. The rebuilding of the structure is significantly affected by the original network structure and by the shape and loading of the nanofillers. Both deformation and reorganization of the network lead to drastic changes in the conductivity of the composites. The crystallization process also affects the conductive network to some extent and the subsequent volume shrinkage of the polymeric matrix after crystallization results in a further decrease in the resistivity of HDPE/GNP composites. Classical electrical percolation theory combined with a kinetic equation is used to describe the conductivity recovery of composites during annealing, and the results are found to be in good agreement with experimental data.
LanguageEnglish
Pages227-235
JournalPolymer International
Volume67
Issue number2
Early online date13 Dec 2017
DOIs
Publication statusPublished - Feb 2018

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Carbon Nanotubes
Graphite
Graphene
Carbon nanotubes
Polymers
Electric properties
Phase transitions
Composite materials
Polyethylene
High density polyethylenes
Crystallization
Annealing
Differential scanning calorimetry
Melting
Agglomeration
Recovery
Kinetics

Keywords

  • Carbon nanotubes
  • Graphene nanoplatelets
  • Polymer composites
  • Network structure
  • Phase transition

Cite this

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title = "Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures",
abstract = "Multi-walled carbon nanotube (MWCNT)- and graphene nanoplatelet (GNP)-filled high-density polyethylene (HDPE) composites with dispersed and segregated network structures were prepared by solution-assisted mixing. Simultaneous DC conductivity and differential scanning calorimetry were used to measure electrical conductivity during composite thermal phase transitions.It was found that the conductive network is deformed during melting and rebuilt again during annealing due to there-agglomeration of nanofillers. The rebuilding of the structure is significantly affected by the original network structure and by the shape and loading of the nanofillers. Both deformation and reorganization of the network lead to drastic changes in the conductivity of the composites. The crystallization process also affects the conductive network to some extent and the subsequent volume shrinkage of the polymeric matrix after crystallization results in a further decrease in the resistivity of HDPE/GNP composites. Classical electrical percolation theory combined with a kinetic equation is used to describe the conductivity recovery of composites during annealing, and the results are found to be in good agreement with experimental data.",
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author = "D Xiang and L Wang and Y Tang and C Zhao and E Harkin-Jones and Y Li",
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T1 - Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures

AU - Xiang, D

AU - Wang, L

AU - Tang, Y

AU - Zhao, C

AU - Harkin-Jones, E

AU - Li, Y

PY - 2018/2

Y1 - 2018/2

N2 - Multi-walled carbon nanotube (MWCNT)- and graphene nanoplatelet (GNP)-filled high-density polyethylene (HDPE) composites with dispersed and segregated network structures were prepared by solution-assisted mixing. Simultaneous DC conductivity and differential scanning calorimetry were used to measure electrical conductivity during composite thermal phase transitions.It was found that the conductive network is deformed during melting and rebuilt again during annealing due to there-agglomeration of nanofillers. The rebuilding of the structure is significantly affected by the original network structure and by the shape and loading of the nanofillers. Both deformation and reorganization of the network lead to drastic changes in the conductivity of the composites. The crystallization process also affects the conductive network to some extent and the subsequent volume shrinkage of the polymeric matrix after crystallization results in a further decrease in the resistivity of HDPE/GNP composites. Classical electrical percolation theory combined with a kinetic equation is used to describe the conductivity recovery of composites during annealing, and the results are found to be in good agreement with experimental data.

AB - Multi-walled carbon nanotube (MWCNT)- and graphene nanoplatelet (GNP)-filled high-density polyethylene (HDPE) composites with dispersed and segregated network structures were prepared by solution-assisted mixing. Simultaneous DC conductivity and differential scanning calorimetry were used to measure electrical conductivity during composite thermal phase transitions.It was found that the conductive network is deformed during melting and rebuilt again during annealing due to there-agglomeration of nanofillers. The rebuilding of the structure is significantly affected by the original network structure and by the shape and loading of the nanofillers. Both deformation and reorganization of the network lead to drastic changes in the conductivity of the composites. The crystallization process also affects the conductive network to some extent and the subsequent volume shrinkage of the polymeric matrix after crystallization results in a further decrease in the resistivity of HDPE/GNP composites. Classical electrical percolation theory combined with a kinetic equation is used to describe the conductivity recovery of composites during annealing, and the results are found to be in good agreement with experimental data.

KW - Carbon nanotubes

KW - Graphene nanoplatelets

KW - Polymer composites

KW - Network structure

KW - Phase transition

U2 - 10.1002/pi.5502

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JO - Polymer International

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JF - Polymer International

SN - 0959-8103

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