Melt-mixed thermoplastic composites containing carbon nanotubes for thermoelectric applications

Luo, Jinji; Krause, Beate; Pötschke, Petra

doi:10.3934/matersci.2016.3.1107

Cited by 30 publications

(21 citation statements)

References 21 publications

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“…Namely, it can be easily upscaled and it is more environmentally friendly as no solvents are needed. Examples of this new kind of melt-mixed composites are polypropylene (PP) composites filled with single-walled carbon nanotubes (SWCNT) [6][7][8][9][10], polyetherimide/SWCNT nanocomposites [11], polycarbonate/multi-walled carbon nanotube (MWCNT) composites [12][13][14], polylactic acid (PLA)-based composites containing Bi 0.5 Sb 1.5 Te 3 and/or MWCNTs [15], PLA filled with MWCNT and/or expanded graphite [16], and poly(vinylidene fluoride) (PVDF)-based polymer composite foams with MWCNTs or GNPs [17]. In a recent paper, screening of different kinds of CNTs in different polymeric matrices was performed, showing that a variety of TE properties can be achieved when varying CNT and polymer type [18].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…[17] Reproduced with permission from Elsevier on the differences in mechanical, electrical, and rheological properties of thermoplastics-based CNTs composites on the basis of the type of CNTs chosen. [21][22][23][24][25][26][27][28][29][30][31][32] It is evident from the table that presence of SWCNTs has more pronounced effect on the properties of the composites compared to that of MWCNTs. This enhanced effect rendered by SWCNTs is owing to fact that the network formation by the SWCNTs particles within the polymer matrix takes place at a much lower concentration in case of SWCNTs than that of MWCNTs, which in turn helps in facilitating and improving the CNTspolymer interaction that leads to exhibition of better performance by the polymer/SWCNTs composites.…”

Section: Various Aspects Of Polymer Nanocompositesmentioning

confidence: 99%

“…[26] PP/SWCNTs composites exhibited an electrical percolation threshold of 0.1 wt% of incorporated SWCNTs. [27] PP/MWCNTs composites exhibited an electrical percolation threshold of 3 wt% of incorporated MWCNTs in presence of talc. [28] Rheological properties PP/SWCNTs composites have shown a rheological percolation threshold between 0.6 wt% and 1.8 wt% of incorporated SWCNTs.…”

Section: Properties Swcnts Mwcntsmentioning

confidence: 99%

Melt‐mixed carbon nanotubes/polymer nanocomposites

Banerjee

Dutta

2019

Polymer Composites

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This article reviews the recent development in performance and fabrication of carbon nanotubes (CNTs)‐based polymer nanocomposites synthesized by melt‐mixed process. CNTs have attracted enormous attention, since its presence (even in low concentration) causes drastic improvements in the mechanical and electrical properties of several polymer composites. It is suggested that the dispersion state of CNTs within polymer matrices is dictated by the cohesive strength of the CNTs “agglomerates.” Based on this suggestion, this review involves an in‐depth investigation on the origin of this CNTs “agglomerates” when present within polymer matrices. Attempts have also been done to investigate and correlate the varying extent of CNTs “agglomerates” in different polymer matrices. It is considered that the extent of dispersion of CNTs “agglomerates” depends on the interfacial interaction between the two phases, difference in their melt viscosities, and types of CNTs, compatibilizer and modifier used. A comprehensive study has been done on the effect of processing parameters used during melt‐mixing process; functionalization of CNTs, and the effect of compatibilizers and modifier on the final properties and morphology. Herein, an attempt has been done to study the correlation between the synthetic procedure, developed structure, and observed properties of nanocomposites of polymers and CNTs.

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“…FTEM 1 film shows lower Seebeck coefficient compare to the ZnO bulk or nanoparticle; The reason for this can be assigned to the restricted movement of the charge carrier inside the insulating polymer matrix that increase the losses of the thermally energized charge carrier. The FTEM 2 film shows a large increase in the Seebeck coefficient; this can be assigned to the decrease of the electrical resistivity of the FTEM films by the high conductivity of the PANI filler (Luo et al 2016). Another reason for increasing Seebeck coefficient of FTEM 2 film can be subjected to reduce the screening effect for PANI filler (Lei et al 2015).…”

Section: Electrical Conductivitymentioning

confidence: 99%

“…Other research in enhance piezoelectric nanogenerator output power was done by incorporating high electrical conductivity material like MWCNT (Sun et al 2013) and PANI as an alternative to MWCNT (Sultana et al 2015) to make electrical bridge in the polymer matrix. On the other hand, the modification of thermoelectric output power was focused on making thermoelectric paste material consist of p-type material and polymer matrix (Andrei et al 2014) or adding conductive filler to the thermoelectric paste to enhance the figure of merit by increasing the electrical conductivity (Andrei et al 2016;Luo et al 2016). The MWCNT filler was investigated in many researches.…”

Section: Introductionmentioning

confidence: 99%

Enhance the figure of merit for flexible thermoelectric materials by reducing the screening effect

Ismail

Hussein

2017

Appl Nanosci

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A flexible thermoelectric materials (FTEM) films based on Polydimethylsiloxane as the polymer matrix and (Zinc Oxide, Polyaniline and multi wall Carbon nanotube) as the fillers were prepared. The fillers were prepared using modified sol-gel method to enhance the distribution of the nanoparticles inside the polymer matrix and good performance. The Seebeck coefficient, electrical conductivity, thermal conductivity and dielectric measurements were carried out for all of the four films. The Seebeck coefficient results for the investigated films were -40, 220, -120, 280 lv/k°at 200°C for FTEM 1, 2, 3, 4 alternatively. The sign and the value for the Seebeck measurements show a great dependent on the filler type add to the film. The electrical conductivity results for the films was varied from 2 9 10 -8 to 0.14 S/m and strongly dependent on the fillers electrical conductivity. The less dependent on the thermal conductivity of the fillers and a slight change in the thermal conductivity value of the films were obtained. The figure of merit for the films was ranged from 1.14 9 10 -16 to 3.134 9 10 -8 . The dielectric results ranged from 4 to 3500. Reducing the screening effect will increase the electrical conductivity and Seebeck coefficient values.

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Melt-mixed thermoplastic composites containing carbon nanotubes for thermoelectric applications

Cited by 30 publications

References 21 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

Melt‐mixed carbon nanotubes/polymer nanocomposites

Enhance the figure of merit for flexible thermoelectric materials by reducing the screening effect

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