Influence of graphite and SEBS addition on thermal and electrical conductivity and mechanical properties of polypropylene composites

Krause, Beate; Cohnen, Andreas; Pötschke, Petra; Hickmann, Thorsten; Koppler, D.; Proksch, B.; Kersting, T.; Hopmann, Christian

doi:10.1063/1.5016696

Cited by 8 publications

(9 citation statements)

References 2 publications

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“…In contrast, the thermal conductivity requires phonon transport between neighboring thermal conductive fillers. Thus, the trends in the development of electrical properties and thermal conductivity with filler content are very different for polymer composites [9,10,11,12,13,14,15,16,17,18,19,20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Carbon-based materials such as highly thermal conductive carbon nanotubes (CNT) [12,22], graphite (G) [17], carbon fibers (CF), carbon black (CB), or graphite nanoplatelets (GNP) [23] appear to be the best fillers to couple high thermal as well as electrical conductivity with light weight. In current research, the trend of improving the thermal conductivity of polymers is focused on the use of nanofillers with high thermal conductivity [22].…”

Section: Introductionmentioning

confidence: 99%

“…Naji et al [19] described for polycarbonate (PC) composites that CNT can act as a bridge between larger fillers, such as carbon fibers and graphite, and fill the gaps to form a more effective conductive network. There are only a few papers that consider the electrical and thermal conductivity of polymer nanocomposites together [11,13,17,19,21].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

2019

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Melt-mixed composites based on polypropylene (PP) with various carbon-based fillers were investigated with regard to their thermal conductivity and electrical resistivity. The composites were filled with up to three fillers by selecting combinations of graphite nanoplatelets (GNP), carbon fibers (CF), carbon nanotubes (CNT), carbon black (CB), and graphite (G) at a constant filler content of 7.5 vol%. The thermal conductivity of PP (0.26 W/(m·K)) improved most using graphite nanoplatelets, whereas electrical resistivity was the lowest when using multiwalled CNT. Synergistic effects could be observed for different filler combinations. The PP composite, which contains a mixture of GNP, CNT, and highly structured CB, simultaneously had high thermal conductivity (0.5 W/(m·K)) and the lowest electrical volume resistivity (4 Ohm·cm).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

2019

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“…For example, through‐plane and in‐plane conductivity values of 1.1 and 1.9 S/cm, respectively, have been reported for polyethylene filled with 63 wt% graphite . Krause et al showed that in PP filled with 80 wt% different graphites, the thermal conductivity of 13–16 W/m•K remained unaffected by the introduction of styrene‐ethylene‐butylene‐styrene block copolymer (SEBS) based impact modifier, while the electrical conductivity was slightly decreased from 5 S/cm to 2 S/cm.…”

Section: Introductionmentioning

confidence: 99%

“…Thermoplastic‐based CPCs have been prepared with filler loadings as high as 80 wt% for BPP application . For example, through‐plane and in‐plane conductivity values of 1.1 and 1.9 S/cm, respectively, have been reported for polyethylene filled with 63 wt% graphite .…”

Section: Introductionmentioning

confidence: 99%

Hybrid conductive filler/polycarbonate composites with enhanced electrical and thermal conductivities for bipolar plate applications

et al. 2018

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Conductive polymer composites (CPCs) with high electrical and thermal conductivities are demanded for bipolar plates of fuel cells. In this work, CPCs of polycarbonate (PC) filled with carbon nanotube (CNT), carbon fiber (CF), graphite (G), and their double and triple hybrids were prepared using solution casting method followed by compression molding. The results showed that the electrical percolation thresholds for the PC‐CNT and PC‐CF were ~1 wt% and ~10 wt%, respectively, while no clear threshold was found for PC‐G composites. Addition of 3–5 wt% CNT improved the electrical conductivity of PC‐CF and PC‐G systems up to 6 orders of magnitude and enhanced the thermal conductivity as much as 65%. The results of triple hybrid CPCs (with constant loading of 63 wt%) indicated that the combination of highest electrical and thermal conductivities is achieved when the CF and CNT loadings were near their percolation thresholds. Therefore, a triple filler system of 3 wt% CNT, 10 wt% CF, and 50 wt% G resulted in a composite with the through‐plane and in‐plane electrical conductivity, and thermal conductivity values of 12.8 S/cm, 8.3 S/cm, and 1.7 W/m•K, respectively. The results offer a combination of properties surpassing the existing values and suitable for high‐conductivity applications such as bipolar plates. POLYM. COMPOS., 40:3189–3198, 2019. © 2018 Society of Plastics Engineers

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Processing methods for conductive polymer composite bipolar plates: Effect on plate quality and performance

2023

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Conductive polymer composites (CPCs) have been identified as viable replacements for graphite and metals for polymer electrolyte membrane fuel cell (PEMFC) bipolar plates (BPs). One important factor, apart from composite formulation, that affects the quality and properties of CPC BPs is the processing route. Therefore, understanding the possible processing methods for different matrix-filler combinations and their effects on the quality and properties of the plates can help in controlling and improving the final performance of BPs. This paper reviews the blending and molding techniques for CPC BPs, with a focus on relationship between formulation and processing method. The effects of processing route and conditions on microstructural features of CPC BPs, which affect the performance of the plates are also discussed. Finally, directions for further studies with potential to advance the development of quality and high-performance CPC BPs are highlighted. Identified key areas for further research include control of filler orientation to improve through-plane conductivity, correlation between processing parameters and dimensional accuracy of molded plates, and additive manufacturing of composite BPs.

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Influence of graphite and SEBS addition on thermal and electrical conductivity and mechanical properties of polypropylene composites

Cited by 8 publications

References 2 publications

Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

Hybrid conductive filler/polycarbonate composites with enhanced electrical and thermal conductivities for bipolar plate applications

Processing methods for conductive polymer composite bipolar plates: Effect on plate quality and performance

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