Mechanical vs. electrical hysteresis of carbon nanotube/styrene–butadiene–styrene composites and their influence in the electromechanical response

Costa, P.; Ribeiro, Sylvie; Lanceros‐Méndez, S.

doi:10.1016/j.compscitech.2015.01.006

Cited by 61 publications

(45 citation statements)

References 18 publications

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“…This behavior was ascribed to the stronger interfacial interactions between SBS and MWCNTs than those between the TPU and MWCNTs. Costa et al . produced CPNs based on SBS/MWCNT, by solution and casting, and showed that these nanocomposites present a great potential as strain piezoresistive sensors.…”

Section: Introductionmentioning

confidence: 99%

Flexible conductive poly(styrene‐butadiene‐styrene)/carbon nanotubes nanocomposites: Self‐assembly and broadband electrical behavior

Santos

Melo

Goncalves

et al. 2018

J of Applied Polymer Sci

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Flexible conductive nanocomposites with the ability of self‐assembly into well‐ordered structures are promising multifunctional materials for energy conversion and storage devices. In this work, flexible nanocomposites based on multi‐walled carbon nanotubes (MWCNTs) and poly(styrene‐butadiene‐styrene) (SBS) were obtained by solution casting, followed by a post‐annealing treatment, during 7 days at 110 °C, to enable the self‐organization of the SBS. The impact of the MWCNTs on the self‐assembly was studied by atomic force microscopy and Small angle X‐rays scattering, and the conductivity of these nanocomposites was analyzed over the broadband frequency range, that is, 10−1–106 Hz. The results revealed that the lower MWCNTs loadings (∼0.2 v %) were the most suitable to achieve a conductive network through the SBS, maintaining self‐assembled domains. These domains include hexagonally packed cylinders and alternating lamellae. Furthermore, at loadings above 1 v %, the impact of further MWCNTs addition on the conductivity was marginal over the whole frequency range and the self‐assembly tendency was progressively reduced. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46650.

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Section: Introductionmentioning

confidence: 99%

Flexible conductive poly(styrene‐butadiene‐styrene)/carbon nanotubes nanocomposites: Self‐assembly and broadband electrical behavior

Santos

Melo

Goncalves

et al. 2018

J of Applied Polymer Sci

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“…In addition, the cyclic testing results provided in Figure C,D also reveal that the 1.5CNS‐1CB composite outperforms the 1.5CNS‐1CNT system at the same strain levels. However, due to the mechanical hysteresis of TPU composites and the competition of network destruction and rebuilding during cyclic tensile testing, there are two peaks in each cycle for both composites, which was also observed in other elastomer‐based CPCs …”

Section: Resultsmentioning

confidence: 56%

Hybrid systems of three‐dimensional carbon nanostructures with low dimensional fillers for piezoresistive sensors

Sang

Manas‐Zloczower

2019

Polymer Composites

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As an alternative of single filler system, hybrid fillers system is beneficial for the fabrication of elastomer‐based piezoresistive strain sensors with high strain sensitivity for structural health monitoring and human motion detection. However, a comprehensive understanding for the effect of the secondary filler dimensionality on piezoresistive strain sensor sensitivity by hybrid carbon nanofillers strategy is missing. Here, we report a comparative study about the effect of branched carbon nanostructures (CNS, three‐dimensional, 3D) combined with carbon black (CB, 0D) or carbon nanotubes (CNT, 1D) on the piezoresistive behavior of thermoplastic polyurethane (TPU)‐based composites. At either the same total filler content or similar electrical resistivity, using CNS‐CB hybrid is more efficient than using CNS alone or CNS‐CNT hybrid for improving piezoresistive sensitivity of the TPU composites. For instance, the composite 1.5CNS‐1CB has a gauge factor (GF) of 21 and 99 at strain ε = 50 and 100%, respectively, while the composites 2.5CNS and 1.5CNS‐1CNT have GF values of 4.3 and 9.1 at strain ε = 50% and 14 and 20 at strain ε = 100%, respectively. Besides, the TPU composite with CNS‐CB shows a larger response to finger bending (50° on an index finger) by comparison with that contains only CNS, indicating potential applications for human motion detection. This study introduces a facile way to fabricate strain‐sensitive sensors aimed at strain of 50%–100%, strengthening understanding the selection of hybrid carbon nanofillers with different dimensionalities to optimize piezoresistive sensor design.

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“…Noteworthy, for all composites during dynamic loadings, double‐peak patterns were observed. Such behavior is commonly noted for other piezoresistive CECs, and is mainly related to the creep and slow stress relaxation of CECs under fast loading and unloading at room temperature …”

Section: Resultsmentioning

confidence: 99%

Effect of Solvent on Segregated Network Morphology in Elastomer Composites for Tunable Piezoresistivity

Sang

Guo

et al. 2019

Macro Materials & Eng

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Flexible, light‐weight, and wearable electronics have significant potential for the development of Internet of Things. Flexible sensors with tunable piezoresistive properties are in high demand for various practical applications. Herein, different morphology thermoplastic polyurethane (TPU)/ carbon nanostructure (CNS) composites with segregated network are obtained by swelling the TPU powders using various solvents. The better solvent for TPU, dimethylformamide (DMF), renders the composites with 0.7 wt% CNS stronger polymer‐filler interactions, resulting in significantly improved piezoresistive sensitivity at strain larger than 150%. Also the gauge factors (GFs) for these composites are 9.7 in the range 0–60% strain and 19.3 for 60–100% strain. In contrast, the composites with ethanol (EtOH) and tetrahydrofuran (THF) which swell less the TPU show delayed increase in piezoresistivity and GFs of 2.2 and 3.5 for strain up to 100%, respectively, suggesting potential applications for stretchable conductors.

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Mechanical vs. electrical hysteresis of carbon nanotube/styrene–butadiene–styrene composites and their influence in the electromechanical response

Cited by 61 publications

References 18 publications

Flexible conductive poly(styrene‐butadiene‐styrene)/carbon nanotubes nanocomposites: Self‐assembly and broadband electrical behavior

Flexible conductive poly(styrene‐butadiene‐styrene)/carbon nanotubes nanocomposites: Self‐assembly and broadband electrical behavior

Hybrid systems of three‐dimensional carbon nanostructures with low dimensional fillers for piezoresistive sensors

Effect of Solvent on Segregated Network Morphology in Elastomer Composites for Tunable Piezoresistivity

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