Shear and extensional rheology and flow‐induced orientation of carbon nanofiber/polystyrene melt composites

Miyazono, Koki; Kagarise, Christopher; Koelling, Kurt W.; Mahboob, Monon; Bechtel, Stephen E.

doi:10.1002/app.32923

Cited by 9 publications

(6 citation statements)

References 48 publications

(41 reference statements)

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“…1.0 of the elongational strain). Although there have been a lot of studies on the elongational viscosity for a polymer composite with fibers,22–24 the strain‐hardening behavior has not been detected to the best of our knowledge, except for PP with fibrous PTFE 14…”

Section: Resultsmentioning

confidence: 99%

Modification of Rheological Properties Under Elongational Flow by Addition of Polymeric Fine Fibers

Yamaguchi

Fukuda

Yokohara

et al. 2011

Macro Materials & Eng

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A new technique to provide melt elasticity using flexible fine fibers prepared from a polymer with high melting point is demonstrated. A polymer composite of poly(propylene) with a small amount of fine fibers of poly(butylene terephthalate) shows marked strain‐hardening behavior in elongational viscosity, i.e., a rapid increase in the transient elongational viscosity with time or strain. The blend also shows prominent normal stress difference at steady shear. These elastic properties have not been observed for polymer composites with rigid fibers and can be applicable to the modification of rheological properties and thus the improvement of processability.

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Section: Resultsmentioning

confidence: 99%

Modification of Rheological Properties Under Elongational Flow by Addition of Polymeric Fine Fibers

Yamaguchi

Fukuda

Yokohara

et al. 2011

Macro Materials & Eng

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“…In our system, the Cox-Merz rule holds, irrespective of CF content. Miyazono et al 37 reported on the relationship between the morphology and rheological behavior of polymer composites containing well-dispersed CF. In this study, the well-dispersed CF rotated in shear flow without orientation and the Cox-Merz rule was realized.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, CF may be well dispersed in the PE matrix, given that the experimental data approximately coincided with Batchelor's theoretical equation. Miyazone et al 37 also explained that the linear elongational viscosity did not agree with 3Z, owing to the orientation of the fiber experiencing extensional deformation. In contrast, in the report of Takahashi et al, 50 the strain hardening of these composites became weaker than that of the matrix with fillers of increasing aspect ratios.…”

Section: Uniaxial Elongational Viscositymentioning

confidence: 99%

“…[46][47][48] In this equation, there are two assumptions: the value of l is much greater than the distance h among fiber, h is much larger than d, namely (do oho ol). Miyazono et al 37 reported that Batchelor's equation can be applied in a molten polymer composite by calculating the number average length. We reported that the number average length of CF decreased by 60-70 percent when mixed with a co-rotating twin screw extruder, irrespective of CF content.…”

Section: Uniaxial Elongational Viscositymentioning

confidence: 99%

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Effect of carbon fiber on the capillary extrusion behaviors of high-density polyethylene

Uematsu

Horisawa

Horikida

et al. 2012

Polym J

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The capillary extrusion behaviors of high-density polyethylene (PE) containing carbon fibers (CF) were investigated from a viewpoint of their rheological properties. For values of CF content ranging from 0 to 5 wt%, the oscillatory moduli of PE slightly increased with CF content. Transient shear flow measurements showed that the steady shear viscosity and first normal stress difference of PE also slightly increased with the addition of CF. Conversely, the strain hardening behaviors of PE were suppressed by CF addition. It was found that CF becomes well dispersed in the PE matrix and that the elongation of the PE chain can be prevented by the presence of CF. The swell ratio of PE, which is the ratio of the diameters of the extrudate and the die, decreased with CF. Using a wide entrance angle die, PE/CF exhibited helical distortion at a higher output rate than that of PE. Using a narrow entrance angle die, sharkskin failure was observed in PE/CF at a higher output rate than in PE, although the helical distortion of PE was inhibited by CF. We discuss the origin of the helical distortion as an effect of CF on the swell behavior and the flow instabilities of PE in reference to the rheological behavior.

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“…It has also been reported earlier that such kind of dependence in the filament break-up time on CNTs concentration in CNT blended epoxy resins could be explained by the formation of CNT clumps-aggregates, ropes, and bundles [ 52 ]. However, we have shown that the surface of the produced filaments was smooth and not affected by the clumps at all the concentrations of CNTs ( Figure 3 ), except a heavily loaded sample containing 1 wt.% of CNTs.…”

Section: Resultsmentioning

confidence: 67%

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

et al. 2022

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A strategy of doping by multi-walled carbon nanotubes (MWCNT) to enhance mechanical strength and the electrical conductivity of ceramic fibers has nowadays attracted a great deal of attention for a wide variety of industrial applications. This study focuses on the effect of MWCNTs on rheological properties of metal alkoxide precursors used for the preparation of nanoceramic metal oxide fibers. The rheological behavior of MWCNT-loaded titanium alkoxide sol precursors has been evaluated via an extensional rheometry method. A substantial decrease in elongational viscosity and relaxation time has been observed upon an introduction of MWCNTs even of low concentrations (less than 0.1 wt.%). A high quality MWCNT/nanoceramic TiO2 composite fibers drawn from the specified precursors has been validated. The MWCNT percolation, which is mandatory for electrical conductivity (50 S/m), has been achieved at 1 wt.% MWCNT doping.

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Shear and extensional rheology and flow‐induced orientation of carbon nanofiber/polystyrene melt composites

Cited by 9 publications

References 48 publications

Modification of Rheological Properties Under Elongational Flow by Addition of Polymeric Fine Fibers

Modification of Rheological Properties Under Elongational Flow by Addition of Polymeric Fine Fibers

Effect of carbon fiber on the capillary extrusion behaviors of high-density polyethylene

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

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