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

Xiang, D, Wang, L, Tang, Y, Zhao, C, Harkin-Jones, E and Li, Y (2018) Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures. Polymer International, 67 (2). pp. 227-235. [Journal article]

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DOI: 10.1002/pi.5502

Abstract

In this study, multi-walled carbon nanotube (MWCNTs) and graphene nanoplatelet (GNPs) 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 (DSC) was used to measure electrical conductivity during the composite thermal phase transitions. It was found that the conductive network is deformed during melting and rebuilt again during annealing due to the re-agglomeration of nanofillers. The re-building of the structure is significantly affected by the original network structure and by the shape and loading of the nanofillers. Both deformation and reorganisation of the network lead to a drastic changes in the conductivity of 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 the experimental data.

Item Type:Journal article
Keywords:Carbon nanotubes; Graphene nanoplatelets; Polymer composites; Network structure; Phase transition
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
ID Code:39751
Deposited By: Professor Eileen Harkin-Jones
Deposited On:24 Apr 2018 07:42
Last Modified:13 Dec 2018 23:23

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