Melt mixed SWCNT-polypropylene composites with very low electrical percolation

Krause, Beate; Pötschke, Petra; Il'in, E. T.; Predtechenskiy, M. R.

doi:10.1016/j.polymer.2016.06.004

Cited by 68 publications

(50 citation statements)

References 31 publications

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“…Conductive carbo‐based nanoparticles dispersed in an insulating polymer matrix can be used to modulate the conductivity of the resulting nanocomposites over more than 10 orders of magnitude . Based on the particular nanoparticle properties and concentrations, very different electrical nanocomposite properties can be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…The small size, high aspect ratio and high conductivity of CNTs make it possible to prepare conductive composites at much lower filler content than can be achieved with larger, traditional particles. Their high aspect ratio, if dispersed well, ensures that the CNTs nanocomposites demonstrate a low electrical percolation threshold and thus form an electrically conductivity network at low concentrations of CNTs . It is well known that the conductivity of a carbon nanotube network depends on a large variety of parameters.…”

Section: Introductionmentioning

confidence: 99%

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The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Nobile

Valentino

Morcom

et al. 2017

Polymer Engineering & Sci

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The morphological, rheological and electrical properties of nanocomposites based on multi‐walled carbon nanotubes (MWNTs) and high density polyethylene (HDPE), prepared by melt mixing, have been investigated. The effects of temperature, MWNT concentration and nanotube surface treatment have been analyzed. A good dispersion of oxidized nanotubes in the HDPE matrix was found using electron microscopy investigations, as has also been found in the case of related nonfunctionalized MWNTs. The rheological oscillatory shear tests in the melt state have been carried out with strain amplitude values within the linear viscoelastic region. The rheological measurements on the nonfunctionalized MWNT/HDPEs revealed that the percolation threshold was temperature dependent with lower values at higher temperatures. At low frequencies, the oxidized MWNTs/HDPE composites showed storage modulus and complex viscosity values lower than the corresponding values measured for nanocomposites prepared with nonfunctionalized MWNTs. The conductivity decrease is more than 2 orders of magnitude for the sample with 2.5 wt% oxidized MWNTs, compared to the un‐oxidized comparator materials. A constant voltage, long‐term stability test allowed to estimate the average number of electrically active percolation paths and showed that stepwise conductivity loss is preceded by a strong increase in the noise amplitude related to the electrical current. POLYM. ENG. SCI., 57:665–673, 2017. © 2017 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Nobile

Valentino

Morcom

et al. 2017

Polymer Engineering & Sci

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“…Tuball™ SWCNT with average diameter of 1.6 nm and a length exceeding 5 µm was purchased from OCSiAl S.a.r.l. (Luxembourg) [17]. NC7000™ MWCNT were obtained from Nanocyl, S.A. (Sambreville, Belgium) [18].…”

Section: Methodsmentioning

confidence: 99%

Does the Type of Polymer and Carbon Nanotube Structure Control the Electromagnetic Shielding in Melt-Mixed Polymer Nanocomposites?

et al. 2020

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A suitable polymer matrix and well dispersed conducting fillers forming an electrically conducting network are the prime requisites for modern age electromagnetic shield designing. An effective polymer-based shield material is designed that can attenuate 99.9% of incident electromagnetic (EM) radiation at a minimum thickness of <0.5 mm. This is accomplished by the choice of a suitable partially crystalline polymer matrix while comparing non-polar polypropylene (PP) with polar polyvinylidene fluoride (PVDF) and a best suited filler nanomaterial by comparing different types of carbon nanotubes such as; branched, single-walled and multi-walled carbon nanotubes, which were added in only 2 wt %. Different types of interactions (polar-polar and CH-π and donor-acceptor) make b-MWCNT more dispersible in the PVDF matrix, which together with high crystallinity resulted in the best electrical conductivity and electromagnetic shielding ability of this composite. This investigation additionally conceals the issues related to the thickness of the shield material just by stacking individual thin nanocomposite layers containing different carbon nanotube (CNT) types with 0.3 mm thickness in a simple manner and finally achieves 99.999% shielding efficiency at just 0.9 mm thickness when using a suitable order of the different PVDF based nanocomposites.

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“…[15] The average tube diameter was 1.8 nm. Purification of nanotubes from byproducts was performed by tip sonication in 2 wt.% water solution of sodium cholate for 4 h and ultracentrifugation at 22 400 g. The separation of metallic and semiconducting nanotubes was made using the ATPE technique.…”

Section: Swncts Samples Preparationmentioning

confidence: 97%

A Comparative Study of Field Emission From Semiconducting and Metallic Single‐Walled Carbon Nanotube Planar Emitters

Kleshch

Eremina

Serbun

et al. 2017

Physica Status Solidi (b)

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Field electron emission from thin films composed of solely metallic or semiconducting single-walled carbon nanotubes is investigated using a scanning tip anode technique. Metallic and semiconducting nanotubes are separated by aqueous two-phase extraction. Local field emission centers observed on nanotube films of both types showed non-linear FowlerNordheim (FN) plots bent downwards. The curving of FN plots is much stronger for semiconducting nanotubes which is explained by their higher electrical resistance and stronger field penetration effect compared to metallic nanotubes. Particular nanotubes of both types revealed oscillations in current-voltage characteristics. The periodic oscillations indicated that the field emission current is modulated either by resonant tunnelling from confinement states in nano-objects formed by adsorbates or by the Coulomb blockade effect that can occur for emission from short carbon nanotubes.

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Melt mixed SWCNT-polypropylene composites with very low electrical percolation

Cited by 68 publications

References 31 publications

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Does the Type of Polymer and Carbon Nanotube Structure Control the Electromagnetic Shielding in Melt-Mixed Polymer Nanocomposites?

A Comparative Study of Field Emission From Semiconducting and Metallic Single‐Walled Carbon Nanotube Planar Emitters

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