Destruction and formation of a conductive carbon nanotube network in polymer melts: In-line experiments

Alig, Ingo; Lellinger, Dirk; Engel, Miriam; Skipa, Tetyana; Pötschke, Petra

doi:10.1016/j.polymer.2008.01.073

Cited by 149 publications

(135 citation statements)

References 16 publications

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“…Injection molding 221 after the formation of the final part. Similar effects are reported in the literature for the increase of electrical conductivity of nanocomposite melt [95] or the change of electrical properties after the specimen annealing. [210] In both examples the changes are related to the viscoelastic relaxation of the polymer matrix allowing the reorientation of loosely-packed agglomerates and not entangled carbon nanotubes.…”

Section: Recovery Of Conductive Networksupporting

confidence: 89%

“…Alig et al [95] reported strong dependence between electrical conductivity, MWCNT content and processing parameters for nanocomposites based on polycarbonate. The destruction of nanofiller network and, thus a decrease of electrical conductivity was reported when a high screw speed was used.…”

Section: Compounding Of Nanocompositesmentioning

confidence: 99%

“…% of MWCNT. [95] Experiment set up was based on a slit dye in the outlet of a twin-screw extruder equipped with pressure, temperature and electric sensors. After stopping the extrusion and keeping the parameters constant the conductivity of the material increased.…”

Section: Mechanical Properties Of Mwcnt Nanocompositesmentioning

confidence: 99%

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Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization

Wegrzyn¹

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Section: Recovery Of Conductive Networksupporting

confidence: 89%

Section: Compounding Of Nanocompositesmentioning

confidence: 99%

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Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization

Wegrzyn¹

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“…The structure of conductive pathways in the final material is significantly influenced by shear and/or elongational forces applied during the processing [3]. Alig et al have shown the impact of processing conditions on the conductivity of polycarbonate/carbon nanotube composites by in-line melt extrusion experiments [4]. In order to design materials with desirable properties, it is important to understand the development of the conductive structures during the melt processing.…”

Section: Introductionmentioning

confidence: 99%

Shear induced electrical behaviour of conductive polymer composites

Starý¹,

Krückel²,

Schubert³

2013

AIP Conference Proceedings

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Abstract. The time-dependent electrical resistance of polymethylmethacrylate containing carbon black was measured under oscillatory shear in the molten state. The electrical signal was oscillating exactly at the doubled frequency of the oscillatory shear deformation. Moreover, the experimental results gave a hint to the development of conductive structures in polymer melts under shear deformation. It was shown that the flow induced destruction of conductive paths dominates over the flow induced build-up in the beginning of the shear deformations. However, for longer times both competitive effects reach a dynamic equilibrium and only the thermally induced build-up of pathways influences the changes in the composite resistance during the shear. Furthermore, the oscillating electrical response depends clearly on the deformation amplitude applied. A simple physical model describing the behaviour of conductive pathways under shear deformation was derived and utilized for the description of the experimental data.

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“…This task is important for industrial applications and very interesting and challenging from the theoretical point of view. Electrical properties of polymer nanocomposites, filled with attractively interacting conductive anisometric particles, strongly depend on the morphology of filler network [14,15] as well as on the orientation state of individual particles [16,17]. Therefore, one finds in literature two different approaches for the modelling of the electric properties of those composites.…”

mentioning

confidence: 99%

Superposition approach for description of electrical conductivity in sheared MWNT/polycarbonate melts

Saphiannikova¹,

Skipa²,

Lellinger³

et al. 2012

Express Polym. Lett.

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The theoretical description of electrical properties of polymer melts, filled with attractively interacting conductive particles, represents a great challenge. Such filler particles tend to build a network-like structure which is very fragile and can be easily broken in a shear flow with shear rates of about 1 s–1. In this study, measured shear-induced changes in electrical conductivity of polymer composites are described using a superposition approach, in which the filler particles are separated into a highly conductive percolating and low conductive non-percolating phases. The latter is represented by separated well-dispersed filler particles. It is assumed that these phases determine the effective electrical properties of composites through a type of mixing rule involving the phase volume fractions. The conductivity of the percolating phase is described with the help of classical percolation theory, while the conductivity of non-percolating phase is given by the matrix conductivity enhanced by the presence of separate filler particles. The percolation theory is coupled with a kinetic equation for a scalar structural parameter which describes the current state of filler network under particular flow conditions. The superposition approach is applied to transient shear experiments carried out on polycarbonate composites filled with multi-wall carbon nanotubes

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Destruction and formation of a conductive carbon nanotube network in polymer melts: In-line experiments

Cited by 149 publications

References 16 publications

Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization

Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization

Shear induced electrical behaviour of conductive polymer composites

Superposition approach for description of electrical conductivity in sheared MWNT/polycarbonate melts

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