Viscoelastic properties of carbon black suspension as a flocculated percolation system

Amari, Takeshi; Uesugi, Kenji; Suzuki, Hiroaki

doi:10.1016/s0300-9440(97)00033-7

Cited by 26 publications

(20 citation statements)

References 19 publications

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“…At 0.3 wt.% CNT contents, the flow regime of the resin suspensions was significantly altered at low frequencies and a pseudo-solid like behavior was more visible. We referred this as pseudo-solid like behavior since in true-solid like behavior the storage modulus (G 0 ) is fully independent of frequency [11]. In addition, suspensions with 0.1 and 0.3 wt.% of MWCNTs exhibited slightly higher storage modulus values especially at low frequencies as compared to those with MWCNT-NH 2 .…”

Section: Rheological Behavior Of the Suspensionsmentioning

confidence: 99%

“…5 and 6 give shear viscosity as a function of shear rate for the neat resin blend and resin suspensions containing MWCNTs and MWCNT-NH 2 , respectively. In principle, shear viscosity of a pure polymer is divided into two distinct regions including the Newtonian and shear thinning regions [9][10][11]. At low shear rates, the Newtonian region independent of shear rate is observed followed by shear thinning region through which shear viscosity linearly declines with shear rate.…”

Section: Rheological Behavior Of the Suspensionsmentioning

confidence: 99%

“…It was revealed that the Brownian motion of CNT particles with huge aspect ratio results in more considerable viscoelastic rheological behavior as compared to those of micrometer size short fiber or particles such as carbon black [7,8]. However, the number of works reported in the literature on the rheological behavior of CNT/polymer systems is quite limited [6][7][8][9][10][11]. The rheological behavior of concentrated aqueous nanotube dispersions was studied by Kinloch et al [7].…”

Section: Introductionmentioning

confidence: 99%

“…Measuring the temperature dependent material properties is also critical for determination of appropriate processing conditions to predict the behavior of polymeric components during their service life [2][3][4][5][6][7][8][9][10][11][12]. The dispersion state of carbon nanotubes influences the dynamic mechanical properties of the resulting nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Rheological and dynamic-mechanical behavior of carbon nanotube/vinyl ester–polyester suspensions and their nanocomposites

Seyhan

Gojny

Tanoğlu

et al. 2007

European Polymer Journal

108

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Rheological properties of vinyl ester-polyester resin suspensions containing various amounts (0.05, 0.1 and 0.3 wt.%) of multi walled carbon nanotubes (MWCNT) with and without amine functional groups (-NH 2 ) were investigated by utilization of oscillatory rheometer with parallel plate geometry. Dispersion of corresponding carbon nanotubes within the resin blend was accomplished employing high shear mixing technique (3-roll milling). Based on the dynamic viscoelastic measurements, it was observed that at 0.3 wt.% of CNT loadings, storage modulus (G 0 ) values of suspensions containing MWCNTs and MWCNT-NH 2 exhibited frequency-independent pseudo solid like behavior especially at lower frequencies. Moreover, the loss modulus (G 00 ) values of the resin suspensions with respect to frequency were observed to increase with an increase in contents of CNTs within the resin blend. In addition, steady shear viscosity measurements implied that at each given loading rate, the resin suspensions demonstrated shear thinning behavior regardless of amine functional groups, while the neat resin blend was almost the Newtonian fluid. Furthermore, dynamic mechanical behavior of the nanocomposites achieved by polymerizing the resin blend suspensions with MWCNTs and MWCNT-NH 2 was investigated through dynamic mechanical thermal analyzer (DMTA). It was revealed that storage modulus (E 0 ) and the loss modulus (E 00 ) values of the resulting nanocomposites increased with regard to carbon nanotubes incorporated into the resin blend. In addition, at each given loading rate, nanocomposites containing MWCNT-NH 2 possessed larger loss and storage modulus values as well as higher glass transition temperatures (T g ) as compared to those with MWCNTs. These findings were attributed to evidences for contribution of amine functional groups to chemical interactions at the interface between CNTs and the resin blend matrix. Transmission electron microscopy (TEM) studies performed on the cured resin samples approved that the dispersion state of carbon nanotubes with and without amine functional groups within the matrix resin blend was adequate. This implies that 3-roll milling process described herein is very appropriate technique for blending of carbon nanotubes with a liquid thermoset resin to manufacture nanocomposites with enhanced final properties.

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Section: Rheological Behavior Of the Suspensionsmentioning

confidence: 99%

Section: Rheological Behavior Of the Suspensionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rheological and dynamic-mechanical behavior of carbon nanotube/vinyl ester–polyester suspensions and their nanocomposites

Seyhan

Gojny

Tanoğlu

et al. 2007

European Polymer Journal

108

View full text Add to dashboard Cite

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“…Indeed, the value of G′ depends on both the structure of the network (number of bonds between the particles in the suspension) and the strength of the interparticle bonds 13. 24 The surfactant TX does not aggregate in neat PC,25 and hence, the increase in G′ does not correspond to the micellization of the TX surfactant. Instead, the alkyl phenyl chains of the TX surfactant may become adsorbed onto the hydrophobic surface of KB, leaving the poly(ethylene oxide) chains dangling in the PC.…”

Section: Resultsmentioning

confidence: 99%

Asymmetric Supercapacitors Based on Activated‐Carbon‐Coated Carbon Nanotubes

Shi

Zhitomirsky

2015

ChemElectroChem

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A new method is developed for the fabrication of asymmetric supercapacitor devices containing fibrous electrode materials. The approach is based on the synthesis of uniform polypyrrole (PPy) coatings on multiwalled carbon nanotubes (MWCNT), which were used for the fabrication of MWCNTs coated with N‐doped activated carbon (N‐AC). The N‐AC‐MWCNT electrodes show good electrochemical performance in positive and negative potential windows. The electrochemical performance of positive electrodes is further enhanced by the development of MnO2‐coated N‐AC‐MWCNT. In this approach, the problem of MWCNT degradation in the reaction with KMnO4 is avoided by the use of a sacrificial N‐AC layer, which allows a relatively high mass content of MnO2 in the final material. The approach offers the advantages of small size of MnO2 nanoparticles, good electrical contact of MnO2 and MWCNT and fibrous microstructure of the material. Testing results show a remarkably high specific capacitance of 6.29 F cm−2 (311.7 F g−1) at a mass loading of 20 mg cm−2. The important finding is the possibility to fabricate asymmetric devices, which show a specific capacitance of 2.19 F cm−2 (62.7 F g−1) in a voltage window of 1.9 V in aqueous Na2SO4 electrolyte, an energy density of 26.4 mWh g−1 and a power density of 1.7 W g−1. The electrodes and devices show good capacitance retention at high charge–discharge rates and good cycling stability. The asymmetric capacitors developed herein are promising for practical energy‐storage applications.

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Investigating nonlinear viscoelastic properties of molten carbon black/poly(ethylene‐co‐butyl acrylate) composites, using fourier transform rheometry and other test techniques

Leblanc

Jäger

2006

J of Applied Polymer Sci

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ABSTRACT:A series of molten carbon black (CB)/poly-(ethylene-co-butyl acrylate) (EBA) composites were investigated through Fourier transform (FT) rheometry and other techniques. Filler loadings were above the critical percolation value, and consequently, strongly nonlinear viscoelastic properties were observed, with, in addition, an unusual complexity of carbon black effects when compared with other systems, for instance filled elastomers. FT rheometry appears particularly sensitive to such a complexity with typical variations of torque harmonics, as dynamic torsional strain is increased at constant frequency and temperature. How CB particles are distributed in the material appears as the key to understand experimental results. Indeed, in CB-EBA composites, filler particles concentrate in amorphous regions of the polymer, which are also butyl acrylate (BA)-rich regions. At room temperature, such composites are basically dual-phase systems: ethylene segments (PE)-rich crystallites and CB-rich amorphous BA regions. Solid-state mechanical properties reflect this morphology. As temperature increases, crystallites melt down allowing a pseudofluid state to be eventually reached but the dual-phase morphology is essentially kept. It follows that, under increasing (dynamic) strain, such complex dual-phase molten systems exhibit a response that initially reflects a contribution from PE-rich regions, easier to deform than CB-rich amorphous BA regions, before the expected response of the filled BA phase is observed.

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Viscoelastic properties of carbon black suspension as a flocculated percolation system

Cited by 26 publications

References 19 publications

Rheological and dynamic-mechanical behavior of carbon nanotube/vinyl ester–polyester suspensions and their nanocomposites

Rheological and dynamic-mechanical behavior of carbon nanotube/vinyl ester–polyester suspensions and their nanocomposites

Asymmetric Supercapacitors Based on Activated‐Carbon‐Coated Carbon Nanotubes

Investigating nonlinear viscoelastic properties of molten carbon black/poly(ethylene‐co‐butyl acrylate) composites, using fourier transform rheometry and other test techniques

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