Comparative study of singlewalled, multiwalled, and branched carbon nanotubes melt mixed in different thermoplastic matrices

Krause, Beate; Barbier, Carine; Kunz, Karina; Pötschke, Petra

doi:10.1016/j.polymer.2018.11.010

Cited by 57 publications

(40 citation statements)

References 76 publications

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“…The comparison of PP/B-SWCNT composite materials with those containing the unmodified base SWCNTs is shown in Table 1, which lists the thermoelectric parameters S, PF, and ZT of composite materials with 0.25-2 wt% SWCNTs. It should be noted that the composite preparation conditions by melt compounding followed by compression molding as well as the applied PP grade and thermoelectric measurement procedure were identical for all specimens between this study and the results in [32] which were selected for this comparison. For PP composites with B-SWCNTs, the Seebeck coefficient, power factor, and figure of merit ZT were always higher than for composites with pristine SWCNTs.…”

Section: Resultsmentioning

confidence: 99%

“…However, the remaining agglomerates of B-SWCNTs were smaller than those of SWCNTs. The better dispersion of B-SWCNT in PP is also indicated by a lower agglomerate area ratio A A of 1.0% ± 0.4% compared to A A = 1.6% ± 0.7% for PP/SWCNTs [32]. To characterize the SWCNT dispersion in the microscale, cryofractured surfaces of PP composites were observed using SEM (Figure 7).…”

Section: Resultsmentioning

confidence: 99%

“…The given values represent the mean values of three measurements. The figure of merit ZT was calculated using a value for the thermal conductivity of PP composites of 0.28 W/(m•K) [32][33][34]. The same instrument was used to measure the electrical conductivity and Seebeck coefficient of the SWCNT powders.…”

Section: Methodsmentioning

confidence: 99%

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Boron Doping of SWCNTs as a Way to Enhance the Thermoelectric Properties of Melt-Mixed Polypropylene/SWCNT Composites

et al. 2020

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Composites based on the matrix polymer polypropylene (PP) filled with single-walled carbon nanotubes (SWCNTs) and boron-doped SWCNTs (B-SWCNTs) were prepared by melt-mixing to analyze the influence of boron doping of SWCNTs on the thermoelectric properties of these nanocomposites. It was found that besides a significantly higher Seebeck coefficient of B-SWCNT films and powder packages, the values for B-SWCNT incorporated in PP were higher than those for SWCNTs. Due to the higher electrical conductivity and the higher Seebeck coefficients of B-SWCNTs, the power factor (PF) and the figure of merit (ZT) were also higher for the PP/B-SWCNT composites. The highest value achieved in this study was a Seebeck coefficient of 59.7 µV/K for PP with 0.5 wt% B-SWCNT compared to 47.9 µV/K for SWCNTs at the same filling level. The highest PF was 0.78 µW/(m·K2) for PP with 7.5 wt% B-SWCNT. SWCNT macro- and microdispersions were found to be similar in both composite types, as was the very low electrical percolation threshold between 0.075 and 0.1 wt% SWCNT. At loadings between 0.5 and 2.0 wt%, B-SWCNT-based composites have one order of magnitude higher electrical conductivity than those based on SWCNT. The crystallization behavior of PP is more strongly influenced by B-SWCNTs since their composites have higher crystallization temperatures than composites with SWCNTs at a comparable degree of crystallinity. Boron doping of SWCNTs is therefore a suitable way to improve the electrical and thermoelectric properties of composites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Boron Doping of SWCNTs as a Way to Enhance the Thermoelectric Properties of Melt-Mixed Polypropylene/SWCNT Composites

et al. 2020

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“…Recently, graphene foam (three-dimensional, 3D) has become an attractive alternative to common carbon nanollers for the fabrication of conductive polymer composites due to their excellent conductivity. 16,[60][61][62][63][64] Likewise, branched carbon nanotubes (CNSs) (3D) are superior to multi-walled carbon nanotubes (CNTs) (1D) or graphene nanoplatelets (2D) for improving the electrical conductivity of melt-mixed polymer composites, 34,65 in alignment with theoretical studies. 66 However, for segregated network structures, the literature suggests that carbon nanollers with lower dimensionality tend to have lower F C values and higher electrical conductivity at the same ller loading in thermoplastic nanocomposites.…”

Section: Introductionmentioning

confidence: 88%

Stretchable elastomer composites with segregated filler networks: effect of carbon nanofiller dimensionality

Sang

Manas‐Zloczower

2019

Nanoscale Adv.

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“…The obviously remaining agglomerates of SWCNTs at different length scales resulted in its composite in the lowest direct current (DC) electrical conductivity when compared with the other CNTs (Figure 8c,d). [38] Both MWCNTs and b-MWCNT are capable of rendering higher shielding efficiency by forming better interconnected networks in their composites.…”

Section: Emi Shieldingmentioning

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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Comparative study of singlewalled, multiwalled, and branched carbon nanotubes melt mixed in different thermoplastic matrices

Cited by 57 publications

References 76 publications

Boron Doping of SWCNTs as a Way to Enhance the Thermoelectric Properties of Melt-Mixed Polypropylene/SWCNT Composites

Boron Doping of SWCNTs as a Way to Enhance the Thermoelectric Properties of Melt-Mixed Polypropylene/SWCNT Composites

Stretchable elastomer composites with segregated filler networks: effect of carbon nanofiller dimensionality

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

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