Electrical and rheological percolation in poly(vinylidene fluoride)/multi-walled carbon nanotube nanocomposites

Nanocomposites of poly(vinylidene fluoride) (PVDF) and multi‐walled carbon nanotubes (MWCNTs) were prepared through melt blending in a batch mixer (torque rheometer equipped with a mixing chamber). The morphology, rheological behavior and electrical conductivity were investigated through transmissio...

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Bibliographic Details
Published in:Polymer international 2011-03, Vol.60 (3), p.430-435
Main Authors: Martins, Johnny N, Bassani, Taís S, Barra, Guilherme MO, Oliveira, Ricardo VB
Format: Article
Language:English
Subjects:
Applied sciences
carbon nanotubes
Composites
electrical conductivity
Exact sciences and technology
Forms of application and semi-finished materials
Nanocomposites
Nanomaterials
Nanostructure
Networks
Percolation
poly(vinylidene fluoride)
Polymer industry, paints, wood
Polyvinylidene fluorides
rheological parameters
Rheological properties
Technology of polymers
Thresholds
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Summary:Nanocomposites of poly(vinylidene fluoride) (PVDF) and multi‐walled carbon nanotubes (MWCNTs) were prepared through melt blending in a batch mixer (torque rheometer equipped with a mixing chamber). The morphology, rheological behavior and electrical conductivity were investigated through transmission electron microscopy, dynamic oscillatory rheometry and the two‐probe method. The nanocomposite with 0.5 wt% MWCNT content presented a uniform dispersion through the PVDF matrix, whereas that with 1 wt% started to present a percolated network. For the nanocomposites with 2 and 5 wt% MWCNTs the formation of this nanotube network was clearly evident. The electrical percolation threshold at room temperature found for this system was about 1.2 wt% MWCNTs. The rheological percolation threshold fitted from viscosity was about 1 wt%, while the threshold fitted from storage modulus was 0.9 wt%. Thus fewer nanotubes are needed to approach the rheological percolation threshold than the electrical percolation threshold. Copyright © 2010 Society of Chemical Industry The electrical percolation threshold of a system of poly(vinylidene fluoride) and multi‐walled carbon nanotubes (MWCNTs) was about 1.2 wt% MWCNTs, while the rheological percolation threshold fitted from viscosity was about 1 wt% MWCNTs and that fitted from storage modulus was 0.9 wt%.
ISSN:0959-8103
1097-0126
1097-0126
DOI:10.1002/pi.2965