Shear Flow Induced Alignment of Carbon Nanotubes in Natural Rubber

He, Yan; Cao, Z.; Ma, Linjian

doi:10.1155/2015/964723

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…Different approaches have been used to align the CNTs. Commonly used orientation methods include mechanical forces [ 60 ], magnetic fields [ 61 ], electric fields [ 62 , 63 ], and shear flow [ 64 ]. These approaches present limitations as mechanical and shear forces can damage the structure of CNTs [ 65 ], and magnetic fields are not suitable because a high magnetic field strength is required (>5 T) [ 65 ].…”

Section: Resultsmentioning

confidence: 99%

Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance

et al. 2020

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In this paper, an alternative curing strategy, based on the application of an electric field, is proposed to harden nano-filled multifunctional resins. The resin is obtained through the dispersion of carbon nanotubes, which act as nanometric heater elements in the epoxy matrix. The electro-curing is activated by applying an external electric voltage, which allows tunable cross-linking within the epoxy matrix entrapped between the nanotubes. The electro-curing method allows reaching higher curing degrees with respect to the conventional ones and, consequently, higher glass transition temperatures. This is a direct consequence of the fact that the curing reactions start directly in the regions at the interphase between carbon nanotubes, acting as heater nano-filaments, and the polymeric matrix. The proposed method is able to give composites better properties, making the curing process fast and energy-saving.

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Section: Resultsmentioning

confidence: 99%

Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance

et al. 2020

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“…Polarized Raman spectra can be used to characterize the orientation of CNTs in composites. When the angle between the polarization direction of the laser and the axis of CNT changes, the intensity of the polarized Raman spectrum for CNTs that have a certain degree of orientation will be varied; , however, that for CNTs with random distribution almost does not change Figure gives polarized Raman spectra of m-CNT0.3/EP and t-CNT0.3/EP composites, in which 0°, 30°, 60°, and 90° are polarization angles.…”

Section: Results and Discussionmentioning

confidence: 99%

Origin of Increasing Dielectric Constant at Lower Percolation Threshold through Controlling Spatial Distribution of Carbon Nanotubes in Epoxy Resin with Microwave-Assisted Thermal Curing Technique

Liu¹,

Zheng²,

Yuan³

et al. 2016

J. Phys. Chem. C

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How to fabricate polymer composites with higher dielectric constant at lower content of conductors based on commercial compositions is still an interesting topic with great challenge. Herein, based on multiwalled carbon nanotubes (CNTs) and epoxy resin (EP), new high dielectric constant (high-k) composite (m-CNT/EP) with much higher permittivity and lower percolation threshold (f c) was prepared by a microwave-assisted thermal curing technology. Results show that the spatial structure and performances of CNT/EP composites are dependent on the curing process used. CNTs are orientated along the Z direction in m-CNT/EP composites, while they are randomly permutated in the composite (t-CNT/EP) produced with a traditional thermal curing procedure. Accordingly, t-CNT/EP composites have isotropic dielectric properties, and m-CNT/EP composites exhibit anisotropic dielectric properties. f c values of m-CNT/EP composites in the X, Y, and Z directions are 0.29, 0.29, and 0.24 wt %, respectively, while those of t-CNT/EP composites are equal to 0.39 wt %. When the loading of CNTs is 0.25 wt %, the dielectric constant in the Z direction of m-CNT0.25/EP is as high as 673, about 20.7 times of that of t-CNT0.25/EP. The origin behind these interesting results is discussed from building the relationship between CNT distribution and dielectric properties using finite elements and simulating equal circuits.

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“…Raman spectral analysis is one of the most useful techniques to characterize the carbon-based fillers and their composites (He et al, 2015;Simoncini et al, 2017;Bokobza, 2019). The characteristic peaks which were detected in the vicinity of 1,360 and 1,580 cm -1 were attributed to the D-band (disorder band) and G-band (graphite band or TM-tangential mode) (Abbasi et al, 2010), respectively.…”

Section: Microstructurementioning

confidence: 99%

Fabrication of electrically conductive microparts by constructing carbon black-rich network under high shear conditions in microinjection molding

Lei,

Gong,

et al. 2024

Front. Mater.

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Microinjection molding (μIM) is an important technique to fabricate microparts for applications in the fields of automotive and microelectromechanical systems. However, the prevailing high shear conditions in μIM are unfavorable for constructing intact electrically conductive networks because the added fillers tend to be preferentially aligned along the melt flow direction. In this work, a series of polypropylene/polyamide 6/carbon black (PP/PA6/CB) composites with a selective localization of CB in the PA6 phase were used as the model system to prepare electrically conductive microparts. The prevailing high shearing and extensional flow effects in μIM were utilized to deform CB-rich phase with an aim to in situ construct electrically conductive network, thereby improving the electrical conductivity (σ) of subsequent moldings. The results indicated that a higher σ was achieved for PP/PA6/CB microparts when compared with their PP/CB and PA6/CB counterparts, at a lower filler content (<10 wt%). The influence of blending sequence of various components (i.e., PP, PA6, and CB) and annealing treatment on the σ of microparts was also studied. This work provided an approach to the design and preparation of electrically conductive microparts that can be potentially used in high-tech sectors.

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Shear Flow Induced Alignment of Carbon Nanotubes in Natural Rubber

Cited by 13 publications

References 35 publications

Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance

Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance

Origin of Increasing Dielectric Constant at Lower Percolation Threshold through Controlling Spatial Distribution of Carbon Nanotubes in Epoxy Resin with Microwave-Assisted Thermal Curing Technique

Fabrication of electrically conductive microparts by constructing carbon black-rich network under high shear conditions in microinjection molding

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