Effect of carbon nanotube (CNT) functionalization in epoxy-CNT composites

Roy, Sagar; Petrova, Roumiana S.; Mitra, Somenath

doi:10.1515/ntrev-2018-0068

Cited by 164 publications

(78 citation statements)

References 67 publications

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“…For this reason, this system was selected for direct sonication to disperse CNTs, taking advantage of the low viscosity of ECC resin. Ultrasonication is considered an efficient dispersion method, less time consuming compared to other techniques, although it is known to damage CNTs via introduction of defects and reducing lengths . The formation of defects represents an advantage providing bonding sites between filler and matrix to the already imperfect CNTs made using chemical vapour deposition.…”

Section: Resultsmentioning

confidence: 99%

“…Nonetheless, a beneficial method for improving the epoxy–CNT interactions and thus the dispersion of CNTs is their functionalization (usually by oxidizing the surface), which can preserve the CNT pristine structure, through delocalized π‐bond interactions . It is important to stress that not all functionalization types contribute in a positive way to the enhancement of TC …”

Section: Introductionmentioning

confidence: 99%

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Study of the synergistic effect of boron nitride and carbon nanotubes in the improvement of thermal conductivity of epoxy composites

Isarn

Bonnaud

Massagués

et al. 2019

Polymer International

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The enhancement of the thermal conductivity, keeping the electrical insulation, of epoxy thermosets through the addition of pristine and oxidized carbon nanotubes (CNTs) and microplatelets of boron nitride (BN) was studied. Two different epoxy resins were selected: a cycloaliphatic (ECC) epoxy resin and a glycidylic (DGEBA) epoxy resin. The characteristics of the composites prepared were evaluated and compared in terms of thermal, thermomechanical, rheological and electrical properties. Two different dispersion methods were used in the addition of pristine and oxidized CNTs depending on the type of epoxy resin used. Slight changes in the kinetics of the curing reaction were observed in the presence of the fillers. The addition of pristine CNTs led to a greater enhancement of the mechanical properties of the ECC composite whereas the oxidized CNTs presented a greater effect in the DGEBA matrix. The addition of CNTs alone led to a marked decrease of the electrical resistivity of the composites. Nevertheless, in the presence of BN, which is an electrically insulating material, it was possible to increase the proportion of pristine CNTs to 0.25 wt% in the formulation without deterioration of the electrical resistivity. A small but significant synergic effect was determined when both fillers were added together. Improvements of about 750% and 400% in thermal conductivity were obtained in comparison to the neat epoxy matrix for the ECC and DGEBA composites, respectively. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the synergistic effect of boron nitride and carbon nanotubes in the improvement of thermal conductivity of epoxy composites

Isarn

Bonnaud

Massagués

et al. 2019

Polymer International

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“…Excess PVDF was removed from the surface by washing with acetone after fabrication. The functionalization process and CNIM fabrication methods have been previously reported [41][42][43]. Our previous studies have already proven the ability to retain the CNT coating on the surface for longer periods of time [44,45].…”

Section: Materials and Chemicalsmentioning

confidence: 99%

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Humoud

Roy

Mitra

2019

Water

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Membrane distillation (MD) is fast evolving as a desalination technology for high-salinity waters where scaling remains a major challenge. This paper reports the scaling reduction in carbon nanotube-immobilized membranes (CNIMs) and by the use of the antiscalant polyacrylic acid. High concentrations of CaSO 4 , CaCO 3 , and BaSO 4 were deliberately used to initiate scaling on the membranes. It was observed that after ten hours of operation in a highly scaling CaSO 4 environment, the CNIM showed 127% higher flux than what was observed on a membrane without the CNTs. The trends were similar with CaCO 3 and BaSO 4 , where the CNIM showed significantly improved antiscaling behavior. The normalized flux declination for CNIM was found to be 45%, 30%, and 53% lower compared to the pristine membrane with CaSO 4 , CaCO 3 , and BaSO 4 solutions, respectively. The use of antiscalant in the feed solution was also found to be effective in improving antiscaling behavior, which reduced salt deposition up to 28%, and the water vapor flux was 100% and 18% higher for the pristine polypropylene and CNIM, respectively. Results also showed that the presence of CNTs facilitated the removal of deposited salts by washing, and the CNIM regained 97% of its initial water flux, whereas the polypropylene only regained 85% of the original value.

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“…Carbon nanotubes (CNTs), due to their high aspect ratios, have been regarded as one of the most promising reinforcement material in polymer-based nanocomposites [1][2][3][4][5][6]. Using pullout experiments with atomic force microscopy, the interfacial shear strength of CNTs within polymer matrices have been measured in the range of 35 to 380 MPa [7,8].…”

Section: Introductionmentioning

confidence: 99%

Interfacial characteristics of a carbon nanotube-polyimide nanocomposite by molecular dynamics simulation

Jiang

Tallury²,

Qiu

et al. 2020

Nanotechnology Reviews

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AbstractWith molecular dynamics simulations, nanocomposites were characterized that are comprised of a polyimide (PI) polymer and carbon nanotubes (CNTs) with the same outer diameter but with one, two, or three walls. The simulations indicate that the PI/CNT interaction is strong, regardless of the number of CNT walls, and that there is some degree of alignment of the PI chains near the CNT interface. As the number of CNT walls increased, the density of PI chains near the CNT interface also increased and the average radius of gyration of the PI chains decreased, and these observations were attributed to changes due to the intertube van der Waals interactions. From simulations of the constant force pullout process of the CNT from the PI matrix, the limiting pullout force was calculated to be higher for the triple-walled CNT than for the single-walled one. The interfacial shear strength of the nanocomposites was also calculated from the pullout energy, and the results indicate that increasing the number of walls is a critical factor for enhancing the interfacial stress transfer during tension.

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Effect of carbon nanotube (CNT) functionalization in epoxy-CNT composites

Cited by 164 publications

References 67 publications

Study of the synergistic effect of boron nitride and carbon nanotubes in the improvement of thermal conductivity of epoxy composites

Study of the synergistic effect of boron nitride and carbon nanotubes in the improvement of thermal conductivity of epoxy composites

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Interfacial characteristics of a carbon nanotube-polyimide nanocomposite by molecular dynamics simulation

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