Ultrahigh-shear processing for the preparation of polymer/carbon nanotube composites

Chen, Guangxin; Li, Yongjin; Shimizu, Hiroshi

doi:10.1016/j.carbon.2007.07.017

Cited by 148 publications

(98 citation statements)

References 29 publications

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“…The standard Couette mixing conditions in reference [15] have yielded a strain rate of 500 s −1 ; experimental setups of different geometries could obtain a fluid strain rate as high as 4,000 s −1 [24].…”

Section: Energy Density Delivered From Mixingmentioning

confidence: 99%

Dispersion of Carbon Nanotubes: Mixing, Sonication, Stabilization, and Composite Properties

2012

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Advances in functionality and reliability of carbon nanotube (CNT) composite materials require careful formulation of processing methods to ultimately realize the desired properties. To date, controlled dispersion of CNTs in a solution or a composite matrix remains a challenge, due to the strong van der Waals binding energies associated with the CNT aggregates. There is also insufficiently defined correlation between the microstructure and the physical properties of the composite. Here, we offer a review of the dispersion processes of pristine (non-covalently functionalized) CNTs in a solvent or a polymer solution. We summarize and adapt relevant theoretical analysis to guide the dispersion design and selection, from the processes of mixing/sonication, to the application of surfactants for stabilization, to the final testing of composite properties. The same approaches are expected to be also applicable to the fabrication of other composite materials involving homogeneously dispersed nanoparticles.

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Section: Energy Density Delivered From Mixingmentioning

confidence: 99%

Dispersion of Carbon Nanotubes: Mixing, Sonication, Stabilization, and Composite Properties

2012

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“…That is why a high-shear extruder is used for preparing traced blends. This recent generation of extruder is of scientific importance and possesses a profound prospect in industrial applications: it facilitates the dispersion of fillers in matrices thanks to strong shear forces by simply adjusting the screw rotation speed without any additive [29,30] . To highlight the high shear effect, the micrographs displayed in Figure 4a and b depict the morphologies of traced blends ((PP108 MF 97-T3-0.1) and (BMU133-T3-0.1)) as a function of the screw speed, respectively 100 rpm (a) and 800 rpm (b).…”

Section: Characterization Of the Dispersion And Structure Of T3 Tracermentioning

confidence: 99%

High shear dispersion of tracers in polyolefins for improving their detection

et al. 2015

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SbstractAn efficient recycling of end-of-life products is of crucial interest from an economical and ecological point of view. However, the near infrared spectroscopy often used for the optic sorting processes is limited because of the absorption of carbon black present in black plastics and as it only sorts as a function of chemical formulas. The tracing technology developed in this study is based on the dispersion of lanthanide complexes particles into polymers to give them a code that can be related to their formulation and viscosity that are important parameters for their re-processing. As the success of this technology is conditioned by achieving a fine dispersion of the tracer particles, we also focus on accomplishing a fine dispersion of tracer particles by using a high shear process. Processing under high shear rate (N= 800 rpm) has proved to play a determining role in dispersing finely and homogenously tracer particles within PP matrix. Thanks to the good quality of dispersion, the detection of three tracers at a level of 0.1 wt% has been successfully achieved, even in black matrices for an acquisition time of 10 ms.

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“…And various fabricated methods such as ultrahighshear processing approach and melt-compounding technique have been used. 32,33 The enhancement of the piezoelectric b-polymorph of the nanocomposites in solution-cast films of PVDF and PVDF-based copolymers through blending them with CNTs using the N,N-dimethylacetamide as solvent was first reported by Carroll's group. 34 In our previous studies, we reported the effect of multiwalled carbon nanotubes on the crystallization behavior of PVDF when N,N-dimethylformamide was used as solvent.…”

Section: Introductionmentioning

confidence: 98%

Effect of multiwalled carbon nanotubes on crystallization behavior of poly(vinylidene fluoride) in different solvents

He¹,

Sun²,

Zheng³

et al. 2010

J of Applied Polymer Sci

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In this study, the poly(vinylidene fluoride) (PVDF)-multiwalled carbon nanotubes (MWNTs) composites have been prepared by solution casting in two different solvents: dimethyl sulfoxide (DMSO) and dimethylacetamide (DMAc). Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimeter (DSC) results showed that the crystal phases of PVDF are quite different in the two solvents. When DMSO is used as the solvent, the PVDF crystalline phases could be greatly alternated from a-form to b-form by the incorporation of MWNTs. While the crystalline structure of PVDF hardly change in the case of DMAc. The DSC and polarized optical microphotographs implied that MWNTs not only act as nucleating agents for PVDF but also confine the crystallization of PVDF. Besides, it was found that the storage modulus (E 0 ) of the composites were significantly enhanced with an appropriate content of MWNTs. And when using DMSO as the solvent, one relaxation process emerges in the loss tan d (loss factor) curves of the neat PVDF and PVDF/ MWNTs composites, while it was not observed in the DMAc system. The obtained results revealed that varing solvents have different effects on the crystallization behavior of PVDF with the addition of MWNTs.

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Ultrahigh-shear processing for the preparation of polymer/carbon nanotube composites

Cited by 148 publications

References 29 publications

Dispersion of Carbon Nanotubes: Mixing, Sonication, Stabilization, and Composite Properties

Dispersion of Carbon Nanotubes: Mixing, Sonication, Stabilization, and Composite Properties

High shear dispersion of tracers in polyolefins for improving their detection

Effect of multiwalled carbon nanotubes on crystallization behavior of poly(vinylidene fluoride) in different solvents

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