Core-shell structured carbon nanotube-poly(methylmethacrylate) beads as thermo-conductive filler in epoxy composites

Vu, Minh Canh; Bae, Young Han; Yu, Min Ji; Islam, M. A.; Kim, Sung‐Ryong

doi:10.1016/j.compositesa.2018.02.021

Cited by 20 publications

(8 citation statements)

References 37 publications

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“…Two strong bands at 2995 and 2952 cm −1 are assigned to the C‐H bonds, while peaks at around 3443–3630 cm −1 and 1634 cm −1 are attributed to the O‐H stretching of the absorbed moisture on the PMMA beads . Furthermore, the acrylate carbonyl groups (C=O), ‐CH 3 deformation, and C‐O stretching fluctuations are noticed at 1733, 1390, and 1271 cm −1 , respectively . The oxygen plasma treatment results in the broadening of the sharp peaks of the bare PMMA spectrum as shown in Figure , and the peak at 3439 cm −1 at the spectra of frGO@pPMMA implies the successful wrapping of the frGO on the pPMMA beads.…”

Section: Resultsmentioning

confidence: 94%

“…The negatively charged particles were prepared by introducing oxygenated functional groups onto PMMA surfaces by oxygen plasma treatment as described in a previous report . The plasma treatment of the sample was conducted at the radiation rate of 30 W with a frequency of 13.56 MHz for 5 min and then it was left in the oxygen atmosphere for further 10 min to form oxygenated functional groups (hydroxyl, carbonyl, hydroperoxide, and so on) on the PMMA bead surface .…”

Section: Methodsmentioning

confidence: 99%

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Poly(methyl methacrylate)‐functionalized reduced graphene oxide‐based core–shell structured beads for thermally conductive epoxy composites

Doan

Islam

et al. 2018

J of Applied Polymer Sci

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Thermally conductive epoxy nanocomposite with core-shell structured filler beads has been prepared. The core represents plasma-treated poly(methyl methacrylate) bead, and the shell, amine-functionalized reduced graphene oxide (frGO) sheets. The negatively charged core and the positively charged shell form core-shell unified structure through electrostatic attraction and the conductive bridges are formed among neighboring filler particles in the composite mass. The epoxy composite prepared with these core-shell structured filler shows a thermal conductivity of 0.72 W m −1 K −1 for an overall frGO concentration of as low as 0.96 wt %. Pal model has been applied to evaluate the effective thermal conductivity of frGO sheets that have been realized in the epoxy composition. Assuming the maximum possible volume packing fraction of the spherical beads for random jamming to be equal to 0.63, the effective thermal conductivity has been estimated as 280 W m −1 K −1 . Evaluation of the effective thermal conductivity is a step forward to in-depth study of real contribution of the highly conductive fillers in the polymer composites.

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Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Poly(methyl methacrylate)‐functionalized reduced graphene oxide‐based core–shell structured beads for thermally conductive epoxy composites

Doan

Islam

et al. 2018

J of Applied Polymer Sci

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“…In our previous studies, 25,33 the polymer beads have been utilized to improve the thermal conductivity and thermal properties of polymer composites. The thermally conductive nanoparticles were formed the segregated structure in the presence of polymer beads in the epoxy matrix using hot‐press method 32 .…”

Section: Introductionmentioning

confidence: 99%

3D printing of copper particles and poly(methyl methacrylate) beads containing poly(lactic acid) composites for enhancing thermomechanical properties

Jeong

Kim

et al. 2020

J of Applied Polymer Sci

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Poly(lactic acid) (PLA) composite filaments with different copper (Cu) contents as high as 40 and 20 wt% of poly(methyl methacrylate) (PMMA) beads have been fabricated by twin-screw extruder for 3D printing. A fuseddeposition modeling (FDM) 3D printing technology has been used to print the PLA composites containing hybrid fillers of Cu particles and PMMA beads. The morphology, mechanical, and thermal properties of the printed PLA composites were investigated. The tensile strength was slightly decreased, but storage modulus and thermal conductivity of PLA composites were significantly improved by adding Cu particles in the presence of PMMA beads. The PLA composites with hybrid fillers of 40 wt% of Cu particles and 20 wt% of PMMA beads resulted in thermal conductivity of 0.49 W m −1 K −1 which was three times higher than that of the bare PLA resin. The facilitation of the segregated network of high-thermally conductive Cu particles with the PMMA beads in PLA matrix provided thermally conductive pathways and resulted in a remarkable enhancement in thermal conductivity.

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“…[3][4][5] The polymer-based composites with various thermally conductive fillers are in high demand as thermal management materials because of their easy processability, low production cost, and lightweight. [6][7][8] In general, the thermally conductive composites are prepared by a random dispersion of the fillers in polymer matrix and the composites require a high filler loading to reach a high thermal conductivity. [9][10][11] However, the high filler loading leads to a deterioration of mechanical properties, the difficulty of processing, and heavyweight.…”

Section: Introductionmentioning

confidence: 99%

“…The remarkable decrease of high A/R CuNW-CNF/ epoxy as compared to the other epoxy composites confirms that the high A/R CuNWs easily form the electrically conductive networks in the composites. Compared to the volume resistivity of the pure epoxy, the volume resistivity of epoxy composites is in the range of 10 −2 to 10 8ΩÁcm which corresponds to the semiconductor range6…”

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confidence: 99%

Effect of aspect ratio of vertically aligned copper nanowires in the presence of cellulose nanofibers on the thermal conductivity of epoxy composites

Thieu

Kim

et al. 2020

Polymers for Advanced Techs

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The composites comprising vertically aligned network of copper nanowires (CuNWs) in the presence of cellulose nanofibers were fabricated by using the freeze‐templating method and the effect of aspect ratio (A/R) of CuNWs on the thermal conductivity of epoxy composites was investigated. The thermal conductivity of epoxy composites increased to 0.79 W m−1 K−1 at 1.12 vol% of high A/R CuNWs loading, corresponding to the thermal conductivity enhancement of 365% as compared to the pure epoxy. The thermal conductivity of vertically aligned higher A/R CuNWs/epoxy, which is 38.5% and 51.9% higher than those of the lower A/R CuNWs and the randomly aligned CuNWs, respectively. The application of the epoxy composites in heat dissipation was demonstrated by the temperature changes of composites on a hot plate with the increase of heating time. These results indicate that the thermally conductive composites in this study could be applied for thermal dissipating materials in electronic devices.

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Core-shell structured carbon nanotube-poly(methylmethacrylate) beads as thermo-conductive filler in epoxy composites

Cited by 20 publications

References 37 publications

Poly(methyl methacrylate)‐functionalized reduced graphene oxide‐based core–shell structured beads for thermally conductive epoxy composites

Poly(methyl methacrylate)‐functionalized reduced graphene oxide‐based core–shell structured beads for thermally conductive epoxy composites

3D printing of copper particles and poly(methyl methacrylate) beads containing poly(lactic acid) composites for enhancing thermomechanical properties

Effect of aspect ratio of vertically aligned copper nanowires in the presence of cellulose nanofibers on the thermal conductivity of epoxy composites

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