Electrical Conductivity Performance of Predicted Modified Fibre Contact Model for Multi-Filler Polymer Composite

Radzuan, Nabilah Afiqah Mohd; Sulong, Abu Bakar; Hui, David; Verma, Anil

doi:10.3390/polym11091425

Cited by 10 publications

(7 citation statements)

References 50 publications

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“…Nanocomposites containing CNT are characterized by a negative temperature coef ficient of resistivity (NTC effect), which means that the electrical resistivity of composit decreases during heating. The results obtained coincide with numerous literature report related to nanocomposites [48][49][50].…”

Section: Electrical Propertiessupporting

confidence: 91%

Carbon Nanotube-Based Composite Filaments for 3D Printing of Structural and Conductive Elements

et al. 2021

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In this publication, we describe the process of fabrication and the analysis of the properties of nanocomposite filaments based on carbon nanotubes and acrylonitrile butadiene styrene (ABS) polymer for fused deposition modeling (FDM) additive manufacturing. Polymer granulate was mixed and extruded with a filling fraction of 0.99, 1.96, 4.76, 9.09 wt.% of CNTs (carbon nanotubes) to fabricate composite filaments with a diameter of 1.75 mm. Detailed mechanical and electrical investigations of printed test samples were performed. The results demonstrate that CNT content has a significant influence on mechanical properties and electrical conductivity of printed samples. Printed samples obtained from high CNT content composites exhibited an improvement in the tensile strength by 12.6%. Measurements of nanocomposites’ electrical properties exhibited non-linear relation between the supply voltage and measured sample resistivity. This effect can be attributed to the semiconductor nature of the CNT functional phase and the occurrence of a tunnelling effect in percolation network. Detailed I–V characteristics related to the amount of CNTs in the composite and the supply voltage influence are also presented. At a constant voltage value, the average resistivity of the printed elements is 2.5 Ωm for 4.76 wt.% CNT and 0.15 Ωm for 9.09 wt.% CNT, respectively. These results demonstrate that ABS/CNT composites are a promising functional material for FDM additive fabrication of structural elements, but also structural electronics and sensors.

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Section: Electrical Propertiessupporting

confidence: 91%

Carbon Nanotube-Based Composite Filaments for 3D Printing of Structural and Conductive Elements

et al. 2021

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“…The resistivity of the C3 composite decreased by almost 60% at 30 V compared to the resistivity at 12 V. Above a certain voltage, an exponential decrease in resistivity occurred. This phenomenon is due to two properties characteristic of CNTs: a negative temperature coefficient of resistivity (NTC effect) [29,30] and electron tunneling [31,32]. Firstly, an increase in voltage causes heat to be released in the material being tested, which reduces its resistivity.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Electrically Conductive Nanocomposite Fibers for Flexible and Structural Electronics

et al. 2022

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The following paper presents a simple, low-cost, and repeatable manufacturing process for fabricating conductive, elastic carbon-elastomer nanocomposite fibers for applications in the textile industry and beyond. The presented method allows for the manufacturing of fibers with a diameter of 0.2 mm, containing up to 50 vol. % of graphite powder, 10 vol. % of CNT, and a mix of both fillers. As a result, resistivity below 0.2 Ωm for the 0.2 mm-diameter fibers was achieved. Additionally, conductive fibers are highly elastic, which makes them suitable for use in the textile industry as an element of circuits. The effect of strain on the change in resistance was also tested. Researches have shown that highly conductive fibers can withstand strain of up to 40%, with resistivity increasing nearly five times compared to the unstretched fiber. This research shows that the developed composites can also be used as strain sensors in textronic systems. Finally, functional demonstrators were made by directly sewing the developed fibers into a cotton fabric. First, the non-quantitative tests indicate the feasibility of using the composites as conductive fibers to power components in textronic systems and for bending detection.

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“…The flexural strength was sufficient for use in bipolar plates; however, the conductivity was far below the requirements. In addition, Radzuan et al [36,37] further investigated mixed fillers containing a mixture of MCF, synthetic graphite (SG), and graphene (xGNP). An optimal composition of the PP-mixed filler composite of 5PP/11MCF/1xGNP/3SG resulted in the highest mechanical performance with a hardness of 30 HD at a density of 1.3 g∕cm 3 and an electrical conductivity of 3.32 S/cm.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of graphite/polypropylene composite material reinforced by chopped carbon fibers for proton‐exchange membrane fuel cell bipolar plates

et al. 2023

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In this work, chopped carbon fibers (CCFs) with different lengths were added to graphite/polypropylene (PP) composite materials to achieve high conductivity and flexural strength performances, which are required for use in proton exchange membrane fuel cells. The effects of CCF length (2-4 mm), CCF content (0-5 wt.%), graphite type-natural flake graphite (NFG) and synthetic graphite (SG), and graphite particle size (18-106 µm) on the graphite/PP/CCFs composites are examined. The conductivities of the composites decrease significantly with increasing CCF length above 3 wt.%. CCFs improve the composite's strength, with a maximum strength of 45.8 MPa being achieved with 5 wt.% of 4 mm long CCFs. Composite with NFG exhibits superior conductivity to the one with SG but lacks flexural strength. The NFG particle size significantly affects the conductivity of the composite at high graphite contents, with a particle diameter of 75 µm resulting in maximum conductivity. An optimal composition with 38 µm/82 wt.% NFG and 2 mm/3 wt.% CCF, electrical conductivity, and flexural strength of 189.4 S/cm and 30.2 MPa, respectively, were achieved. Also, this composite exhibited interfacial contact resistance 2.52 mΩ ⋅ cm 2 and contact angles of 111 • , which showed favorable interfacial conductivity and hydrophobicity performances.

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Electrical Conductivity Performance of Predicted Modified Fibre Contact Model for Multi-Filler Polymer Composite

Cited by 10 publications

References 50 publications

Carbon Nanotube-Based Composite Filaments for 3D Printing of Structural and Conductive Elements

Carbon Nanotube-Based Composite Filaments for 3D Printing of Structural and Conductive Elements

Electrically Conductive Nanocomposite Fibers for Flexible and Structural Electronics

Preparation and properties of graphite/polypropylene composite material reinforced by chopped carbon fibers for proton‐exchange membrane fuel cell bipolar plates

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