CNT/ABS nanocomposites by solution processing: Proper dispersion and selective localization for low percolation threshold

Nanocomposites of well-dispersed multi walled carbon nanotubes (MWCNTs) in an acrylonitrilebutadiene-styrene (ABS) matrix were prepared by dry tumble mixing and a subsequent hot compression technique. The preparation method is analysed here to assist in the explanation and understanding of the experimental observations. The vision of the processing method has been confirmed using scanning electron microscopy. As a result of decent dispersion and pre-localization of MWCNTs in the ABS matrix, the electrical conductivity of the nanocomposite as a function of filler content exhibits a distinctive percolation behavior with a percolation threshold of only 0.0005 volume fraction. The high aspect ratio of MWCNTs enables the creation of interconnected networks within the ABS matrix at a very low nanofiller loading, while their high inherent electrical conductivity yields nanocomposites with a high bulk electrical conductivity. To explain the conductivity behaviour, statistical percolation theory and GEM theory are employed. The model parameters elaborated show that both models can adequately describe the behaviour. A comparative analysis of the applicability of percolation theory and GEM theory for expressing the conductivity behavior of the MWCNT/ABS composites with other research works has been performed. Finally, the electrical conductivity of MWCNTs based on the data in this work and elsewhere is evaluated. The universal exponent t is found to be 1.93 for a best-fit value of percolation threshold of 0.00048 5 vol. fraction of MWCNTs in this work. The D shore hardness results have revealed a random increase in hardness and density with an increasing MWCNT content.

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“…6 The I-V behavior for the MWCNT/ABS nanocomposites are shown in Fig. 6 The I-V behavior for the MWCNT/ABS nanocomposites are shown in Fig.…”

Section: I-v Characteristicsmentioning

confidence: 98%

Pre-localized MWCNT network for a low percolation threshold in MWCNT/ABS nanocomposites: experiment and theory

2014

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“…The good dispersion of CNTs favored the formation of a conductive pathway with a small concentration and a reduction of the percolation threshold. 17,18 The dispersion of MWCNTs in the composites with premixing with PVC was better than that of MWCNTs in the composites with premixing with NBR; this resulted in the composites with premixing with PVC having a lower percolation threshold. The percolation thresholds of the composites with premixing with PVC and the composites with premixing with NBR were 2-4 and 6-8 phr, respectively.…”

Section: Conductivitymentioning

confidence: 95%

Microwave‐absorbing performance and mechanical properties of poly(vinyl chloride)/acrylonitrile–butadiene rubber thermoplastic elastomers filled with multiwalled carbon nanotubes and silicon carbide

Zhang

Zhai

Zhang

2013

J of Applied Polymer Sci

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Poly(vinyl chloride) (PVC)/acrylonitrile-butadiene rubber (NBR) were mixed with multiwalled carbon nanotubes (MWCNTs) and silicon carbide (SiC) to prepare microwave-absorbing composites. The complex permittivity, direct-current (dc) conductivity, microwave-absorbing performance, morphology, and mechanical properties of the composites were studied. The real and imaginary parts of the permittivity of the composites increased with increasing MWCNT content. The premixing of the MWCNTs with PVC was more beneficial to the dispersion of MWCNTs; this led to a higher dc conductivity and permittivity and better microwaveabsorbing performance than the premixing of MWCNTs with NBR for the PVC/NBR/MWCNT composites. The PVC/NBR/MWCNT composites had a minimum reflection loss (RL min ) of À49.5 dB at the optimum thickness of 1.96 mm. The efficient microwave absorption of the PVC/NBR/MWCNT composites was due to a high dielectric loss and moderate permittivity. The incorporation of SiC into the PVC/NBR/MWCNT composites increased the real and imaginary parts of permittivity of the composites. When the SiC content was 70 phr, RL min decreased to À34.9 dB at a thickness of 3 mm.

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“…Various experimental studies have shown that functionalization [40,[71][72][73][74], chirality [71,75], aspect ratio [17,62,71], host matrix material [11,76], CNT dispersion in the matrix [17,35,[37][38][39]71,74,77], relative alignment [17,65,75] and other processing variables can all have a significant impact on the electrical properties of the composite.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…It has been observed that various polymers [10][11][12][13][14][15][16][17][18][19][20][21][22], ceramics [23,24], and epoxies [25][26][27][28][29][30][31][32] see enhancements in these properties when blended with CNTs to form composites. [32][33][34][35][36][37][38][39][40] The focus of this work is electronic transport in nanocomposites. In that regard, an accurate understanding of how CNTs modify electrical properties of an otherwise insulating matrix, can extend their utilization to applications such as electromagnetic interference shielding [41][42][43][44][45][46][47][48], electrostatic reduction [13], and strain sensing for structural health monitoring [27,[49][50][51][52]…”

Section: Introductionmentioning

confidence: 99%

A stochastic approach towards a predictive model on charge transport properties in carbon nanotube composites

Tarlton

Brown

Beach

et al. 2016

Composites Part B: Engineering

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CNT/ABS nanocomposites by solution processing: Proper dispersion and selective localization for low percolation threshold

Cited by 57 publications

References 31 publications

Pre-localized MWCNT network for a low percolation threshold in MWCNT/ABS nanocomposites: experiment and theory

Pre-localized MWCNT network for a low percolation threshold in MWCNT/ABS nanocomposites: experiment and theory

Microwave‐absorbing performance and mechanical properties of poly(vinyl chloride)/acrylonitrile–butadiene rubber thermoplastic elastomers filled with multiwalled carbon nanotubes and silicon carbide

A stochastic approach towards a predictive model on charge transport properties in carbon nanotube composites

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