A Novel Concept for Highly Oriented Carbon Nanotube Composite Tapes or Fibres with High Strength and Electrical Conductivity

Deng, Hua; Zhang, Rui; Reynolds, Christopher T.; Bilotti, Emiliano; Peijs, Ton

doi:10.1002/mame.200900151

Cited by 55 publications

(23 citation statements)

References 48 publications

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“…High accelerating voltage is applied to give enriched secondary electrons to perform voltage contrast imaging as demonstrated in literature [34][35][36]. Figure 3a and 3b shows the morphology of the conductive network formed by MWNTs and CB, respectively, and Figure 3c, 3d and 3e shows that of hybrid fillers, where the bright phase is conductive filler and the black background is co-PP matrix.…”

Section: Morphology Of the Compositesmentioning

confidence: 99%

Synergistic effect in conductive networks constructed with carbon nanofillers in different dimensions

Zhang¹,

Li²,

Deng³

et al. 2012

Express Polym. Lett.

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Abstract. Herein, investigation on synergistic effect during network formation for conductive network constructed with carbon nanofillers in different dimensions is conducted. Multi-walled carbon nanotubes (MWNTs) and carbon black (CB) are employed as conductive fillers in this system. Morphological control of the conductive network is realized by adjusting the ratio between different fillers. Classical percolation threshold theory and adjusted excluded volume theory are used to analyze the electrical percolating behavior of these systems. It is observed that the percolation threshold of hybrid fillers filled conductive polymer composites (CPCs) is much lower than that of MWNTs or CB filled CPCs, and it can be reduced from 2.4 to 0.21 wt% by replacing half of the MWNTs with CB. Possible mechanism of this phenomenon is discussed together with morphological observation. A model is proposed to understand the mechanism of the percolation behavior in the composites containing various proportions of nanofillers. Our work is important for the design and preparation of low cost conductive polymer composites with novel electrical property. Vol.6, No.2 (2012) 159-168 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2012.17 * Corresponding author, e-mail: huadeng@scu.edu.cn © BME-PT PE/MWNTs composites prepared by melt blending. The value is often between 1 to 5 wt% for melt compounded systems and considered as statistical percolation threshold [22]. The mechanism behind this significant difference between kinetic and statistical percolation is the prohibition of re-aggregation between CNTs during melt compounding process [22,24]. It was reported that the re-aggregation process of CNTs within polymer melt can take hours to complete [25]. To achieve better conductivity or lower cost, more than one kind of filler, particularly fillers in different aspect ratios, are used to prepare CPCs. Regarding the formation of conductive network with fillers in different aspect ratios, theoretical study has shown that it is not necessary to build conductive network with high aspect ratio filler alone [26], and the percolation threshold is sensitive to the portion of high aspect ratio filler in a system containing fillers in different aspect ratios [27]. There are a number of investigations reported in the literature on mixed carbon fillers filled CPCs [26,[28][29][30][31]. However, the percolation thresholds of these systems filled with mixed fillers are only simple average of that for systems filled with a particular kind of carbon filler. Therefore, more study is needed to study the true synergistic effect between conductive fillers of different dimensionality in building conductive network. In current study, CPCs based on mixed filler between carbon nanofillers in different dimensions and polypropylene will be fabricated. It is well known that polyolefin is a widely used material and its processability is prominent. Moreover, due to the difference in filler dimension and intrinsic structure, the networ...

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Section: Morphology Of the Compositesmentioning

confidence: 99%

Synergistic effect in conductive networks constructed with carbon nanofillers in different dimensions

Zhang¹,

Li²,

Deng³

et al. 2012

Express Polym. Lett.

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“…Filament extrusion requires always a partial melt drawing upon collection. This process negatively affects the CNT network formation [53] as this is destroyed upon drawing, which explains why conductive polymer fibres generally require relatively high loadings of conductive filler.…”

Section: Manufacture Of Conductive and Strain Sensitive Fibresmentioning

confidence: 99%

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

Bilotti

Zhang

Deng

et al. 2013

Composites Science and Technology

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154

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In this paper, the electrical properties of ternary nanocomposites based on thermoplastic polyurethane (TPU) and multi-walled carbon nanotubes (MWCNTs) are studied. In particular two nanofillersdiffering in shape and electrical properties -are used in conjunction with MWCNTs: an electrically conductive CB and an insulating needle-like nanoclay, sepiolite. The ternary nanocomposites were manufactured in a number of forms (extruded pellets, filaments, and compression moulded films) and their morphological and electrical properties characterised as function of time and temperature. The presence of both secondary nanofillers is found to affect the formation of a percolating network of MWCNTs in TPU, inducing a reduced percolation threshold and tuneable strain sensing ability.These ternary nanocomposites can find application as conductive and multi-functional materials for flexible electronics, sensing films and fibres in smart textiles.

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“…CNTs have already demonstrated their role as a multi-functional filler for various ceramic [6][7][8][9][10][11][12] and polymer [13][14][15][16] nanocomposites. However, CNT aggregation during processing of such nanocomposites is one of the major obstacles for their successful exploitation.…”

Section: Introductionmentioning

confidence: 99%

Effects of dispersion surfactants on the properties of ceramic–carbon nanotube (CNT) nanocomposites

Inam

Heaton

Brown

et al. 2014

Ceramics International

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Gum Arabic (GA), Sodium Dodecyl Sulfate (SDS) and their mixture were used for the dispersion of multi-walled carbon nanotubes (CNTs) in an alumina matrix. A good dispersion at low loadings (0.5-1 wt%) of CNTs in alumina was achieved by an ultrasonic bath treatment. Dispersions were evaluated by UV-vis spectroscopy and agglomerate size analysis. The mixture of GA and SDS produced good dispersion as compared to GA and SDS alone. Nanocomposite powders were sintered by Spark Plasma Sintering (SPS). Microstructural, electrical and mechanical characterizations of sintered discs were carried out to evaluate the effectiveness of the different dispersants. The mixture of GA and SDS produced homogeneous and agglomerate-free CNT-alumina nanocomposites with higher electrical conductivity and indentation fracture toughness as compared to nanocomposites prepared using GA and SDS alone.

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A Novel Concept for Highly Oriented Carbon Nanotube Composite Tapes or Fibres with High Strength and Electrical Conductivity

Cited by 55 publications

References 48 publications

Synergistic effect in conductive networks constructed with carbon nanofillers in different dimensions

Synergistic effect in conductive networks constructed with carbon nanofillers in different dimensions

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

Effects of dispersion surfactants on the properties of ceramic–carbon nanotube (CNT) nanocomposites

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