Using supercritical CO2-assisted mixing to prepare graphene/carbon nanotube/epoxy nanocomposites

Chang, Hsin-Ping; Liu, Hung-Chih; Tan, Chung‐Sung

doi:10.1016/j.polymer.2015.08.023

Cited by 25 publications

(25 citation statements)

References 51 publications

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“…The scCO 2 possesses gas‐like diffusivity, liquid‐like density, low viscosity, and zero surface tension, allowing it to wet out even the complicated structures. Reportedly, it does not produce any wasteful reactions, and no residual CO 2 is retained, as tested by Chang et al, through GC‐MS and microscopic observation . Here, we have achieved a well‐dispersed MWCNT/epoxy coating in a single step under scCO 2 assistance.…”

Section: Introductionsupporting

confidence: 52%

“…The dissolving properties and fast diffusion rate of scCO 2 enable the quick incorporation of MWCNT and its homogeneous dispersion throughout the polymer. Upon depressurization, the CO 2 quickly diffuses out and gets completely removed on vacuum degassing . Prior to curing, the dispersion of 1 wt% MWCNT into epoxy resin was optimized through UV‐visible spectroscopy on the basis of Van Hove singularities .…”

Section: Resultsmentioning

confidence: 99%

“…Also, the process of surface modification is not always favored as it could end up in compromising the structural, mechanical, or electrical properties of MWCNT . Another practice of using toxic chemicals in solvent‐based mixing has found to affect the overall properties of the prepared composite and also requires an additional tedious post‐step of solvent removal in order to ensure environmental safety . In a report by Chang et al, it was confirmed that the residual acetone was indeed retained in the prepared MWCNT‐graphene epoxy nanocomposite even after post‐heating treatment .…”

Section: Introductionmentioning

confidence: 99%

“…Another practice of using toxic chemicals in solvent‐based mixing has found to affect the overall properties of the prepared composite and also requires an additional tedious post‐step of solvent removal in order to ensure environmental safety . In a report by Chang et al, it was confirmed that the residual acetone was indeed retained in the prepared MWCNT‐graphene epoxy nanocomposite even after post‐heating treatment . Moreover, under the physical dispersion methods like grinding, ball milling, and ultrasonication or a combination of them, MWCNTs are seriously damaged limiting their performance .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO₂ assistance

Khanam

Singh

Zaidi

2018

Polymers for Advanced Techs

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The corrosion protection performance of epoxy coatings could be enhanced by incorporation of nanofillers such as MWCNT. However, a homogeneous dispersion of MWCNT in epoxy polymer is still a teasing challenge. Herein, we report an environmentally benign single‐step supercritical CO2 processing method to improve the dispersion of MWCNT in epoxy matrix in order to achieve an effective anticorrosive coating. The executed approach provides a cluster‐free uniform distribution of MWCNT in epoxy matrix as characterized with UV‐visible spectroscopy, Fourier transforms infrared spectroscopy, X‐ray diffraction, and surface analysis. The anticorrosive characteristics of MWCNT/epoxy coating were studied in NaCl as well as in photodegraded dye medium through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. We observed the remarkable corrosion of model metal substrate in photodegraded dye medium besides NaCl medium. In both mediums, the protection efficacy of MWCNT/epoxy coating was deduced from the stable impedance arcs in Nyquist plot and increased impedance modulus. The electrochemical impedance spectra were best fitted with equivalent circuits showing the higher values of pore resistance. Also, the MWCNT/epoxy coating exhibited a positive shift of corrosion potential and possessed a lower corrosion rate as compared with neat epoxy coating. More direct evidence of the excellent barrier properties for MWCNT/epoxy coating was visualized in SEM images. The obtained results implied that the superior dispersion of MWCNT into epoxy matrix significantly reduces the porosity of coating and inhibits the permeability of corrosive ions. We expect supercritical CO2 assisted dispersion method can offer an efficient, cost‐effective, and industrially viable route to develop high performance protective coatings for varied commercialized applications.

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Section: Introductionsupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO₂ assistance

Khanam

Singh

Zaidi

2018

Polymers for Advanced Techs

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“…More specifically, both micro-and nano-scale fillers have been developed as additives to epoxy composites to achieve high performance. Various carbon materials, such as graphene, graphene oxide (GO), carbon nanotubes, chopped fibers, and long fibers, have been used as additives to compensate for the weak and brittle properties of epoxy composites [8][9][10][11]. These carbon materials enhance the properties of epoxy composites by providing support or forming a network structure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of epoxy composites reinforced with ammonia-treated graphene oxides

Park¹,

Lee²,

Lee³

2017

Carbon letters

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The effects of ammonia-treated graphene oxide (GO) on composites based on epoxy resin were investigated. Ammonia solutions of different concentrations (14-28%) were used to modify GO. Nitrogen functional groups were introduced on the GO surfaces without significant structural changes. The ammonia-treated GO-based epoxy composites exhibited interesting changes in their mechanical properties related to the presence of nitrogen functional groups, particularly amine (C-NH 2 ) groups on the GO surfaces. The highest tensile and impact strength values were 42.1 MPa and 12.3 J/m, respectively, which were observed in an epoxy composite prepared with GO treated with a 28% ammonia solution. This improved tensile strength was 2.2 and 1.3 times higher than those of the neat epoxy and the non-treated GO-based epoxy composite, respectively. The amine groups on the GO ensure its participation in the cross-linking reaction of the epoxy resin under amine curing agent condition and enhance its interfacial bonding with the epoxy resin.

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Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

Zheng

et al. 2017

J of Applied Polymer Sci

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Herein, a facile method has been reported to efficiently prepare debundled multiwalled carbon nanotubes (MWCNT) and few‐layered graphene using a hyperbranched polyethylene (HBPE), and as hybrid fillers, their modification effects on high‐density polyethylene (HDPE) are well demonstrated. Stable dispersions of debundled MWCNT and graphene in chloroform were respectively obtained by sonication using the HBPE as stabilizer, and MWCNT/graphene/HDPE ternary nanocomposites were then fabricated by solution‐assisted premixing and subsequent melt mixing, at a fixed mass ratio of MWCNT/graphene of 3:1 and serially changed filler loadings. It is found that the MWCNT and graphene have good dispersibility in the composites, and as hybrid fillers, they can effectively form composite net‐like structure, which makes them show better modification effects on both the electrically and thermally conductive properties of HDPE, as compared to the single MWCNT. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44848.

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Using supercritical CO2-assisted mixing to prepare graphene/carbon nanotube/epoxy nanocomposites

Cited by 25 publications

References 51 publications

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO₂ assistance

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO₂ assistance

Mechanical properties of epoxy composites reinforced with ammonia-treated graphene oxides

Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

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Using supercritical CO2-assisted mixing to prepare graphene/carbon nanotube/epoxy nanocomposites

Cited by 25 publications

References 51 publications

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO2 assistance

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO2 assistance

Mechanical properties of epoxy composites reinforced with ammonia-treated graphene oxides

Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

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Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO₂ assistance

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO₂ assistance