A rheological study of concentrated aqueous nanotube dispersions

Kinloch, Ian A.; Roberts, Simon; Windle, Alan H.

doi:10.1016/s0032-3861(02)00664-x

Cited by 163 publications

(99 citation statements)

References 21 publications

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“…[22][23] These results correspond to our obtained results. In addition, some researchers have reported that the plateau modulus G¢ in the low-o region reflected the properties of the fiber network structure.…”

Section: Effect Of Pc Matrix Viscosity J Nithikarnjanatharn Et Alsupporting

confidence: 92%

“…The elastic component of the polymer can be increased by adding rigid particles, [1][2][3][4] and it is well known that the elasticity of fiber suspensions (for example, PC/multiwall CNT composites 22 or aqueous multi-walled CNT dilute suspensions 23 ) drastically increases with their concentration. [22][23] These results correspond to our obtained results.…”

Section: Effect Of Pc Matrix Viscosity J Nithikarnjanatharn Et Almentioning

confidence: 99%

“…The increase in viscosity associated with the addition of CNTs was much higher than that of carbon black. The rheological behavior for CNTdispersed suspension was also studied by Kinloch et al 23 They have examined the network structure of CNTs to determine the elasticity components measured in oscillatory shear. On the basis of these studies, it can be concluded that viscosity of the matrix polymer increases significantly by adding rigid, rod-like material because of the increase in the interparticle interaction compared with the polymer/particle system.…”

Section: Introductionmentioning

confidence: 99%

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The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites

Nithikarnjanatharn

Ueda

Tanoue

et al. 2012

Polym J

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The effect of polycarbonate (PC) matrix viscosity on the thermal conductivity of a PC/vapor-grown carbon fiber (VGCF) composite was investigated in this study in terms of the rheological properties of the PC/VGCF using two types of VGCF. Two types of VGCF, which have different aspect ratios (VGCF-h has an aspect ratio of 40, whereas VGCF-s has an aspect ratio of 100), were added to two types of PC with different viscosities. The storage modulus (G¢) and loss modulus (G 00 ) of the PC slightly increased and thermal conductivity gradually increased with the content of VGCF-h. By adding VGCF-s to low-viscosity PC, rheological properties originating in the network structure were observed. Thermal conductivity of low-viscosity PC drastically increased with the content of VGCF-s. By analyzing the length of VGCF in each composite, we found that the length of VGCF decreased with mixing. It was also easy to shorten VGCF in high-viscosity PC. We clarified that the thermal conductivity of PC/VGCF could be controlled with the viscosity of the polymer matrix because the spread of the network structure of VGCF and/or the breaking of VGCF depended on the viscosity of the polymer matrix.

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Section: Effect Of Pc Matrix Viscosity J Nithikarnjanatharn Et Alsupporting

confidence: 92%

Section: Effect Of Pc Matrix Viscosity J Nithikarnjanatharn Et Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites

Nithikarnjanatharn

Ueda

Tanoue

et al. 2012

Polym J

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“…The viscosity is then observed to decrease by up to two decades while the stress remained essentially constant, before flow initiates at apparent yield stresses of ≈40 Pa and ≈250 Pa for the 0.17 and 0.33 wt.% loadings, respectively. This behaviour is once again indicative of the break-up of the CNT network, and similar observations have been reported for aqueous [22] and other epoxy [21] CNT suspensions. In contrast, the grafted CNTs of the SG6_3 particles remain strongly attached to the substrate and are relatively short.…”

Section: Steady Shear Propertiessupporting

confidence: 87%

“…In contrast, the two NC suspensions containing discrete, nongrafted CNT exhibit viscosities that are between 1 and 2 orders of magnitude higher at 10 -1 s -1 and which decrease sharply as the shear rate increases. Similar large increases in viscosity at low shear rates resulting from CNT addition have been observed for suspensions in other epoxy resins [18][19][20][21] and water [22], and are attributed to the formation of a percolated network between the CNTs. As the shear rate was increased to > 200 s -1 , the viscosities of the NC suspensions decrease and approach those of the epoxy and the SG6_3 suspensions; behaviour indicative of the break-up of the CNT network [18,20].…”

Section: Steady Shear Propertiessupporting

confidence: 71%

Low viscosity processing using hybrid CNT-coated silica particles to form electrically conductive epoxy resin composites

Wilkinson¹,

Kinloch²,

Othman

2016

Polymer

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Hybrid particles of multiwall carbon nanotubes (CNTs) grafted onto silica gel were shown to provide a low viscosity processing route to forming electrically-conductive epoxy resin composites. Rheological studies showed the viscoelastic shear moduli of epoxy resin suspensions containing these particles (named SG6_3) remained within the same order of magnitude as that of the neat resin at ≤5 wt.% loading (containing up to 1.65 wt.% of grafted CNTs). Whereas, the addition of 1.65 wt.% of discrete (nongrafted) CNTs into the same resin increased shear moduli by up to seven orders of magnitude. The complex viscosities of suspensions containing ≤5 wt.% of SG6_3 remained essentially unchanged, whereas an increase of up to five orders of magnitude resulted upon the addition of 1.65 wt.% of nongrafted CNTs. Whilst rheological studies showed SG6_3 did not form a percolated network at levels ≤5 wt.%, addition of only 2 wt.% (containing 0.66 wt.% CNT) was found to form an electrically-conductive percolated network in an epoxy resin composite with conductivity ~ 10 -4 S/m.

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Carbon Nanotube Polymer Composites

Nobile

2012

Wiley Encyclopedia of Composites

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Carbon nanotubes (CNTs) have excellent mechanical, electrical, and thermal properties, and they are considered to be potential ideal fillers in polymers to produce low weight nanocomposites of high performance. This article reviews the thermal, rheological, mechanical, and electrical properties of CNT polymer composites. The crystallization behavior of polymer nanocomposites in the presence of CNTs is discussed because it strongly influences the mechanical properties of the filled polymers. It is, then, shown that the investigation of the rheological properties of CNT composite melts is fundamental to the comprehension of the dynamics and microstructure of CNT polymer composites. New results of the linear viscoelastic behavior and steady‐shear flow of CNT polymer composites are reported and analyzed. After that, the critical issue of the transfer of the superior properties of the CNTs to the nanocomposites is reviewed and discussed. Effective reinforcement can occur only if an adequate interfacial adhesion between the phases is obtained and a stable homogeneous dispersion of the individual CNTs in the host polymer matrix is achieved. If this event occurs, CNT polymer composites show significant improvements in the mechanical properties and electrical conductivity of the polymer matrix; the literature results are summarized and discussed.

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A rheological study of concentrated aqueous nanotube dispersions

Cited by 163 publications

References 21 publications

The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites

The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites

Low viscosity processing using hybrid CNT-coated silica particles to form electrically conductive epoxy resin composites

Carbon Nanotube Polymer Composites

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