Rheology of carbon black suspensions. I. Three types of viscoelastic behavior

Aoki, Yuji; Hatano, Asuka; Watanabe, Hiroshi

doi:10.1007/s00397-002-0278-3

Cited by 43 publications

(40 citation statements)

References 27 publications

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“…The structured CB dispersions are sensitive to various factors including the type and nature of CB particles, 19,28,29 the nature of dispersing medium 30,31 and the preparation method. 4,28,29 In order to precisely determine the percolating threshold (C*), consistent formulation and measurement protocol were applied to all dispersions as described in the Experimental section (Sections 2.1 and 2.2).…”

Section: Percolation Of Aqueous Dispersions Of Carbon Blackthe Rheolomentioning

confidence: 99%

“…19 and the nature of dispersing medium (wetting strength, pH, viscosity, etc.). 30,31 Table 1 depicts a comparison between the currently studied carbon black and previously studied ones 4 in terms of the characteristics of carbons (particle size and surface area) and nature of dispersing medium. It is worth noting that the rheological percolating threshold of dispersions in organic medium (1 M LiTFSI in propylene carbonate) decreases as the particle size decreases (i.e.…”

Section: Dynamic Strain Sweep Of Cb Dispersionsmentioning

confidence: 99%

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Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

et al. 2018

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The aqueous dispersions of a special type of carbon black (CB) in 1 M lithium bis(trifluoromethanesulfonimide) electrolyte is mainly controlled by the affinity of the aqueous electrolyte towards the CB particles rather than the particle size. In spite of its small particle size (30 nm), this type of CB forms a three-dimensional open network which is rheologically and electrically percolated at a relatively high threshold (2.0 wt%) with enhanced rheological and electrical properties. At this percolating threshold, replacing a trace amount of CB with equivalent carbon nanofibers (CNFs) produces hybrid dispersions with higher electrical conductivity and comparable rheological behavior to pure CB dispersions. This hybrid dispersion is dominated by a cooperatively supporting network, which is wired by the flexible filamentous nanofibers so that it is able to recover the conductivity loss under flow conditions due to flow-induced breaking up of the conductive pathways of CB and presumably sustain a higher load of active materials. This finding suggests hybrid dispersions as a promising precursor in the formulation of electrode suspensions for aqueous semi-solid redox flow cells. Fig. 7 Variation of steady-shear viscosity (h) with shear rate _ g for selected CB aqueous dispersions.This journal is

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Section: Percolation Of Aqueous Dispersions Of Carbon Blackthe Rheolomentioning

confidence: 99%

Section: Dynamic Strain Sweep Of Cb Dispersionsmentioning

confidence: 99%

Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

et al. 2018

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“…Rheological properties of CB/polymer compounds and CB suspensions are very important from both academic and industrial points of view. In attempting to elucidate these rheological responses, extensive studies have been carried out for the CB/polymer compounds1–11 and CB suspensions 12–30. The occurrence of both yield stress and thixotropy for these systems has been found.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we studied the dynamic viscoelastic properties of the CB suspensions and found that the rheological behavior of the CB suspensions changes with the affinity of suspending medium toward the CB particles and is classified into three different types of the behavior as summarized below 27. In the medium having a poor affinity for the CB particles, the CB particles form well‐developed network‐like agglomerates.…”

Section: Introductionmentioning

confidence: 99%

Rheological characterization of carbon black/polystyrene solution systems

Aoki

2008

J of Applied Polymer Sci

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Steady-shear measurements of suspensions of carbon blacks (CB) in polystyrene (PS)/di-(butyl phthalate) (DBP) solution were investigated as a function of volume fraction (/) of CB to clarify the effect of the primary particle size and the structure of CB aggregates on the rheological properties. The suspensions show a typical shear-thinning behavior in the range of a shear rate studied. The Casson model was applied to evaluate the viscosity at infinite of shear rate h ' and the yield stress r y for the suspensions. Relative viscosity h ' /h m , (h m : medium viscosity) thus obtained was compared to the high-frequency viscosity for the ideal hard-sphere silica suspensions to evaluate the effective volume fraction / eff of CB aggregates. The / eff value was larger for the higher-structure CB with higher DBP absorption value, irrespective of the primary particle size. The yield stress r y had almost the same / eff dependence for neutral furnace CB/(PS/ DBP) suspensions, although it was larger for acetylene black (AcB)/(PS/DBP) suspensions. These results demonstrated that the effective volume fraction is the most important quantity to characterize the CB aggregates on the rheological properties. It was also found that the correction of the medium viscosity changes due to polymer adsorption on the CB surface is important since neutral furnace CB adsorbs PS polymers but AcB hardly adsorbs PS polymers in the solution.

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“…[33,34] Contrastingly, a power-law type relaxation behavior was shown in a suspension system having a moderate affinity. [35,36] Therefore, it is reasonable that oFibers were dispersed in whole and contacted themselves in the PP matrix. In other words, the performance of dispersibility of eFiber is lower than that of oFiber due to low affinity to PP.…”

Section: Length and Dispersion State Of Fiber In Matrix After Compomentioning

confidence: 99%

Effect of maleic anhydride‐grafted polypropylene on the flow orientation of short glass fiber in molten polypropylene and on tensile properties of composites

et al. 2017

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Composites of polypropylene (PP) and PP blended with maleic anhydride-grafted polypropylene (MAPP) reinforced with short glass fibers were prepared via extrusion compounding and injection molding techniques. The fiber length did not significantly change irrespective of the presence of MAPP after compounding and injection molding. However, the tensile strength of PP/fiber showed significant improvement after MAPP addition. The interfacial shear strength between PP and fiber increased with the addition of MAPP. Examination of the failure surface of a dumbbell specimen after tensile testing confirmed that the fiber highly orientated in the flow direction in the PP/MAPP matrix. The tensile strength enhancement was attributed to the improvement of the interfacial shear strength between PP and fiber. Moreover, in the injection molding process, there was high orientation of the fiber in the flow direction when there was MAPP. We concluded that the presence of MAPP causes increased orientation of the fiber. K E Y W O R D S fibers, orientation, rheology, strength How to cite this article: Uematsu H, Suzuki Y, Iemoto Y, Tanoue S. Effect of maleic anhydride-grafted polypropylene on the flow orientation of short glass fiber in molten polypropylene and on tensile properties of composites.

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Rheology of carbon black suspensions. I. Three types of viscoelastic behavior

Cited by 43 publications

References 27 publications

Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

Aqueous dispersions of carbon black and its hybrid with carbon nanofibers

Rheological characterization of carbon black/polystyrene solution systems

Effect of maleic anhydride‐grafted polypropylene on the flow orientation of short glass fiber in molten polypropylene and on tensile properties of composites

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