Cyclic tension and compression piezoresistivity of carbon nanotube/vinyl ester composites in the elastic and plastic regimes

Ku‐Herrera, J. J.; Avilés, F.

doi:10.1016/j.carbon.2012.02.018

Cited by 128 publications

(78 citation statements)

References 22 publications

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“…The trend implies that the higher the CNT content the more sensitive the system is. This CNT loading-performance sensitivity has been reported in other sensing studies utilizing CNTs in polymer [2,37] and in fibrous composites [18,22,32]. Furthermore, the contribution of the CNTs in sensing is expected to be expressed more in the elastic region rather than the yielding plateau.…”

Section: Evolution Of Apparent Electrical Properties During Mechanicasupporting

confidence: 74%

“…MWCNT produced by catalyzed CVD were supplied by Arkema (France). According to the manufacturer, their diameters were 10-15 nm and they were more than 500 nm long, resulting in an aspect ratio (AR) in the range of [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Previous studies [19,31,32] utilizing the same batch of CNTs showed good mechanical and electrical results for polymer composites.…”

Section: Materials and Experimental Setup 21 Materials And Manufactmentioning

confidence: 99%

See 1 more Smart Citation

Sensing strain and damage in polyurethane/MWCNT nano-composite foams using electrical measurements

Baltopoulos¹,

Αθανασόπουλος²,

Fotiou³

et al. 2013

Express Polym. Lett.

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The addition of carbon nano-fillers (nanofibers (CNF), nanotubes (CNT) etc.) into plastics has been shown to affect the various properties of the resulting material and effectively increase the electrical conductivity of the system by several orders of magnitude [1]. This is attributed to the formation of a conductive network of the conductive nanofillers, which can be described as a percolated network. The increased electrical conductivity of the nano-reinforced materials has given rise to their use in various applications [2]. Polymeric foams (e.g. Rigid PolyUrethane (PUR)) represent a very interesting and useful sub-group, finding vast range of applications due to their versatility. In structural applications, they are commonly used due to the weight saving capabilities they can offer in the design (e.g. as sandwich cores). Combining nano-fillers with foam materials, nanoreinforcement of foams has been developed and studied the past decade, but mainly focused on the mechanical and thermal properties. Electrical conductivity of nano-composite foams is much less studied. Works on the electrical properties of nanoreinforced polymeric foams are rather sporadic [3][4][5][6][7][8][9][10]. The relationship between the resulting electrical conductivity and the density of the rigid foams for given CNT concentrations was reported in [6] but only recently described further [10]. 40Sensing strain and damage in polyurethane-MWCNT nano-composite foams using electrical measurements A. Baltopoulos, N. Athanasopoulos, I. Fotiou, A. Vavouliotis Abstract. This work deals with the damage identification in polymeric foams through the monitoring of the electrical resistance of the system. To assess this idea electrically conductive rigid Poly-Urethane (PUR) foams at various densities were prepared. Multi-Wall Carbon Nanotubes (MWCNT) were dispersed in the host polymer at various concentrations through high shear mixing to provide electrical conductivity to the system. The PUR/MWCNT foams exhibited varying electrical conductivity on a wide range of densities and nano-filler contents. The prepared foams were subject to compression tests. Electrical resistance was recorded online during the tests to monitor the change of the bulk property of the materials. A structural-electrical cross-property relation was exhibited. The distinctive phases of foam compression were successfully identified from the electrical resistance profile recorded during the tests. A characteristic master curve of the change of electrical resistivity with respect to load and damage is proposed and analyzed. It was shown that the found electrical resistance profile is a characteristic of all the MWCNT contents and depends on density and conductivity. MWCNT content contributes mainly to the sensitivity of electrical sensing in the initial stage of compression. Later compression stages are dominated by foam microstructural damage which mask any effect of CNT dispersion. Micro-structural observations were employed to verify the experimental findings and curves.Keywo...

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Section: Evolution Of Apparent Electrical Properties During Mechanicasupporting

confidence: 74%

Section: Materials and Experimental Setup 21 Materials And Manufactmentioning

confidence: 99%

Sensing strain and damage in polyurethane/MWCNT nano-composite foams using electrical measurements

Baltopoulos¹,

Αθανασόπουλος²,

Fotiou³

et al. 2013

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…Assisted by Poisson's contraction, this causes reorientation and alignment of MWCNTs in zones of high local deformation. The nanotubes are able to come into closer contact that appears in an actual decrease in the network resistivity [5,6].…”

Section: Resultsmentioning

confidence: 99%

“…Electrically conductive composites are finding important applications in electronic, automotive, aerospace, and other industries [1][2][3][4]. Due to electrical properties of CNTs, high aspect ratio and their tendency to form percolated networks in viscous matrices at very low CNT contents, they are excellent candidates for the modification of thermosetting matrix systems [4,5]. The combination of a nanotube-modified matrix together with conventional fibre-reinforcements provides a new generation of multi-functional materials with structural health monitoring capabilities [7,8].…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Starkova

Mannov

Schulte

et al. 2015

Composites Science and Technology

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“…Conductive polymer composites have received great attention due to their popular applications in many fields, such as antistatic media [1], electromagnetic interference shielding [2,3], self-regulated heating materials [4], and sensors [5,6]. All kinds of polymers have been used for the preparation of these composites, such as polypropylene (PP), ultrahigh molecular weight polyethylene (UHMWPE), high-density polyethylene (HDPE) and polystyrene (PS).…”

Section: Introductionmentioning

confidence: 99%

Carbon black-filled polypropylene as a positive temperature coefficient material: effect of filler treatment and heat treatment

et al. 2015

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Polymer-based positive temperature coefficient (PTC) composites are of special interest because they have great potential in temperature-sensitive devices. In this work, composites based on polypropylene and carbon black (CB) particles were prepared by solution blending. The electrical and mechanical properties of composites were measured when CB particles were treated with silane coupling agent before added to the PP matrix. It was found that CB treated by coupling agent exhibited a higher filler-polymer interaction which was reflected in the improvement of the mechanical properties and the modification of electrical conductivity of composites, especially when measured against the temperature. The effect of heat treatment on the electrical conductivity, PTC behavior and mechanical properties was also studied. It turned out that the optimal heat treatment condition of composites was at 120°C for 3 h. The differential scanning calorimetry analysis and X-ray diffraction analysis revealed that heat treatment could increase the crystallinity of composites, so that the PTC intensity increased.

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Cyclic tension and compression piezoresistivity of carbon nanotube/vinyl ester composites in the elastic and plastic regimes

Cited by 128 publications

References 22 publications

Sensing strain and damage in polyurethane/MWCNT nano-composite foams using electrical measurements

Sensing strain and damage in polyurethane/MWCNT nano-composite foams using electrical measurements

Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Carbon black-filled polypropylene as a positive temperature coefficient material: effect of filler treatment and heat treatment

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