Effect of additives on MWCNT dispersion and electrical percolation in polyamide 12 composites

Socher, Robert; Krause, Beate; Pötschke, Petra

doi:10.1063/1.5016703

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…There are already some reports about TE properties when using ILs as an additive in melt-mixed composites with CNTs. Typically, ILs improve the dispersion of the fillers and thus, higher electrical conductivities can be achieved or the electrical percolation threshold can be reduced. − For PP/single-walled CNT (SWCNT)-based composites, Luo et al showed that the addition of the IL OMIM-BF 4 resulted in a significant increase in electrical conductivity, as well as Seebeck coefficient, however, the conduction behavior remained p-type . Voigt et al compared the effect of five kinds of ILs on the TE properties of PP/SWCNT composites and found that switching from p- to n-type behavior is possible depending on the IL structure.…”

Section: Introductionmentioning

confidence: 99%

Change of Conduction Mechanism in Polymer/Single Wall Carbon Nanotube Composites upon Introduction of Ionic Liquids and Their Investigation by Transient Absorption Spectroscopy: Implication for Thermoelectric Applications

Krause

Konidakis

Stratakis

et al. 2023

ACS Appl. Nano Mater.

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Polymer composites based on polycarbonate (PC) and polyether ether ketone (PEEK) filled with single-walled carbon nanotubes (SWCNTs, 0.5–2.0 wt %) were melt-mixed to investigate their suitability for thermoelectric applications. Both types of polymer composites exhibited positive Seebeck coefficients (S), indicative for p-type thermoelectric materials. As an additive to improve the thermoelectric performance, three different ionic liquids (ILs), specifically THTDPCl, BMIMPF6, and OMIMCl, were added with the aim to change the thermoelectric conduction type of the composites from p-type to n-type. It was found that in both composite types, among the three ILs employed, only the phosphonium-based IL THTDPCl was able to activate the p- to n-type switching. Moreover, it is revealed that for the thermoelectric parameters and performance, the SWCNT:lL ratio plays a role. In the selected systems, S-values between 61.3 μV/K (PEEK/0.75 wt % SWCNT) and −37.1 μV/K (PEEK/0.75 wt % SWCNT + 3 wt % THTDPCl) were reached. In order to shed light on the physical origins of the thermoelectric properties, the PC-based composites were studied using ultrafast laser time-resolved transient absorption spectroscopy (TAS). The TAS studies revealed that the introduction of ILs in the developed PC/CNT composites leads to the formation of biexcitons when compared to the IL-free composites. Moreover, no direct correlation between S and exciton lifetimes was found for the IL-containing composites. Instead, the exciton lifetime decreases while the conductivity seems to increase due to the availability of more free-charge carriers in the polymer matrix.

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Section: Introductionmentioning

confidence: 99%

Change of Conduction Mechanism in Polymer/Single Wall Carbon Nanotube Composites upon Introduction of Ionic Liquids and Their Investigation by Transient Absorption Spectroscopy: Implication for Thermoelectric Applications

Krause

Konidakis

Stratakis

et al. 2023

ACS Appl. Nano Mater.

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“…Some of the solutions explored are based on the use of carbon nanoparticles such as graphene and single-wall (SWCNT) or multi-wall carbon nanotubes (MWCNT), dispersed in a polymeric matrix at a concentration that allows the formation of a percolation network [13][14][15] , producing an electrically conductive nanocomposite [16][17][18][19] . The advantage of using nanoparticles is the small concentration required to modify the electrical response of the composites from insulating to conductive, the scientific community reporting concentrations ranging from 0,002% to 5% (w/w) [20][21][22][23][24][25] depending on the morphology and properties of the CNT, and on the preparation method (the lower concentration range is usually attained when using solution mixing, whilst higher concentrations are required when adopting melt mixing). In order to achieve an electrically conductive polymer composite at a low carbon nanoparticle content, a sufficiently good nanoparticle dispersion and distribution in the polymer is necessary [26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Development of electrically conductive polymer nanocomposites for the automotive cable industry

Guerreiro

Leite³

et al. 2021

Polímeros

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Thermoelectric Performance of Polypropylene/Carbon Nanotube/Ionic Liquid Composites and Its Dependence on Electron Beam Irradiation

et al. 2022

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The thermoelectric behavior of polypropylene (PP) based nanocomposites containing single walled carbon nanotubes (SWCNTs) and five kinds of ionic liquids (Ils) dependent on composite composition and electron beam irradiation (EB) was studied. Therefore, several samples were melt-mixed in a micro compounder, while five Ils with sufficiently different anions and/or cations were incorporated into the PP/SWCNT composites followed by an EB treatment for selected composites. Extensive investigations were carried out considering the electrical, thermal, mechanical, rheological, morphological and, most significantly, thermoelectric properties. It was found that it is possible to prepare n-type melt-mixed polymer composites from p-type commercial SWCNTs with relatively high Seebeck coefficients when adding four of the selected Ils. The highest Seebeck coefficients achieved in this study were +49.3 µV/K (PP/2 wt.% SWCNT) for p-type composites and −27.6 µV/K (PP/2 wt.% SWCNT/4 wt.% IL type AMIM Cl) for n-type composites. Generally, the type of IL is decisive whether p- or n-type thermoelectric behavior is achieved. After IL addition higher volume conductivity could be reached. Electron beam treatment of PP/SWCNT leads to increased values of the Seebeck coefficient, whereas the EB treated sample with IL (AMIM Cl) shows a less negative Seebeck coefficient value.

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Effect of additives on MWCNT dispersion and electrical percolation in polyamide 12 composites

Cited by 3 publications

References 7 publications

Change of Conduction Mechanism in Polymer/Single Wall Carbon Nanotube Composites upon Introduction of Ionic Liquids and Their Investigation by Transient Absorption Spectroscopy: Implication for Thermoelectric Applications

Change of Conduction Mechanism in Polymer/Single Wall Carbon Nanotube Composites upon Introduction of Ionic Liquids and Their Investigation by Transient Absorption Spectroscopy: Implication for Thermoelectric Applications

Development of electrically conductive polymer nanocomposites for the automotive cable industry

Thermoelectric Performance of Polypropylene/Carbon Nanotube/Ionic Liquid Composites and Its Dependence on Electron Beam Irradiation

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