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Author: Pötschke, Petra × Type: bookPart × Subject: Ionic liquids × Subject: Polymers ×

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    Polymer - Carbon nanotube composites for thermoelectric applications
    (Melville, NY : AIP, 2017) Luo, J.; Krause, Beate; Pötschke, Petra
    The thermoelectric (TE) performance of electrically conductive thermoplastic composites prepared by melt mixing was investigated. A cost effective widely used in industry polymer, namely polypropylene (PP), was chosen as the matrix to fabricate the composites. Singlewalled carbon nanotubes (SWCNTs), the amount (2 wt%) of which was selected to be above the electrical percolation threshold (< 0.2 wt%), were used to form an electrical conducting network. Besides as-produced SWCNTs plasma modified tubes were employed to study the influence of the functionalization on the morphology, dispersion and TE properties of the PP composites. In addition, melt processing conditions, e.g. temperature, rotation speed, and time during mixing in a small-scale compounder were varied. Furthermore, an ionic liquid (IL, 1-methyl-3-octylimidazolium tetrafluoroborate) was used as a processing additive during melt mixing, which was confirmed to improve the electrical conductivity of the composites. Simultaneous increase in the Seebeck coefficient up to a value of 64 μV/K was recorded, leading to a much better power factor of 0.26 μW/(m·K2) compared to composites without IL. This melt mixing strategy opens new avenues for solvent-free, large scale fabrication of polymer based TE materials.
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    PP/SWCNT composites modified with ionic liquid
    (Melville, NY : AIP, 2017) Krause, Beate; Predtechenskiy, M.; Ilin, E.; Pötschke, Petra
    Polypropylene composites filled with singlewalled carbon nanotubes TUBALL® (SWCNTs) were studied with regard to the effect of ionic liquid (IL) addition in different SWCNT:IL ratios (1:0.5 - 1:6). The incorporation of IL leads to a decrease of the electrical percolation threshold and already at 0.025 wt% SWCNT loading reduced resistivity values can be observed. However, the SWCNT macro dispersion, already relatively good without IL, was not affected by the IL incorporation. In addition, the nucleation effect of the SWCNT in polypropylene is not influenced when simultaneously adding IL, whereas the crystallization enthalpy slightly decreases with its addition.