Dielectric properties of surface treated multi-walled carbon nanotube/epoxy thin film composites

Poh, C.L.; Mariatti, M.; Noor, Ahmad Fauzi Mohd; Sidek, Othman; Chuah, T.P.; Chow, S.C.

doi:10.1016/j.compositesb.2015.09.024

Cited by 58 publications

(28 citation statements)

References 30 publications

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“…The diameters of pristine MWCNT and MWCNT‐COOH were within the range of 30–55 nm, whereas for MWCNT‐GLYMO it was observed an increase of about 10 nm in the diameters (up to 65 nm). This thickening of the nanotubes is an indication of the MWCNT wrapping after the silanization process.…”

Section: Resultssupporting

confidence: 92%

Functionalization of carbon nanotubes with (3‐glycidyloxypropyl)‐trimethoxysilane: Effect of wrapping on epoxy matrix nanocomposites

Hoepfner

Pezzin

2016

J of Applied Polymer Sci

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In this work, multiwalled carbon nanotubes (MWCNT), after previous oxidation, are functionalized with excess (3‐glycidyloxypropyl)trimethoxysilane (GLYMO) and used as reinforcement in epoxy matrix nanocomposites. Infrared, Raman, and energy‐dispersive X‐ray spectroscopies confirm the silanization of the MWCNT, while transmission electron microscopy images show that oxidized nanotubes presented less entanglement than pristine and silanized MWCNT. Thickening of the nanotubes is also observed after silanization, suggesting that the MWCNT are wrapped by siloxane chains. Field‐emission scanning electron microscopy reveals that oxidized nanotubes are better dispersed in the matrix, providing nanocomposites with better mechanical properties than those reinforced with pristine and silanized MWCNT. On the other hand, the glass transition temperature of the nanocomposite with 0.05 wt % MWCNT‐GLYMO increased by 14 °C compared to the neat epoxy resin, suggesting a strong matrix–nanotube adhesion. The functionalization of nanotubes using an excess amount of silane can thus favor the formation of an organosiloxane coating on the MWCNT, preventing its dispersion and contributing to poor mechanical properties of epoxy nanocomposites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44245.

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Section: Resultssupporting

confidence: 92%

Functionalization of carbon nanotubes with (3‐glycidyloxypropyl)‐trimethoxysilane: Effect of wrapping on epoxy matrix nanocomposites

Hoepfner

Pezzin

2016

J of Applied Polymer Sci

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“…As shown in Figure (a,b), it is observed that in case of both PVDF–BFO and PVDF–f‐MWCNTs composites, the value of dielectric constant decreases with increase in frequency at entire frequency ranges. It may be explained on the basis that the low frequency region is associated with interfacial polarization and high frequency region is mainly attributed to dipolar relaxation effect . Further, the dielectric loss of the composite films with 1.1 wt % of f‐MWCNTs exhibits high dielectric loss (1.14) at 100 Hz.…”

Section: Resultsmentioning

confidence: 99%

COOHMWCNTs‐induced BiFeO₃‐poly(vinylidene fluoride) (PVDF) composites with enhanced dielectric and ferroelectric properties

Mahaling

2017

J of Applied Polymer Sci

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In this work, flexible three phase composite films were prepared with surface functionalized multi-walled carbon nanotubes (f-MWCNTs) and bismuth ferrite (BiFeO 3 ;BFO) particles embedded into the poly(vinylidene fluoride) (PVDF) matrix via solution casting technique. The properties and the microstructure of prepared composites were investigated using an impedance analyzer and field emission scanning electron microscope. The micro-structural study showed that the f-MWCNTs and BFO particles were dispersed homogeneously within the PVDF matrix, nicely seated on the floor of the f-MWCNTs separately. The dielectric measurement result shows that the resultant composites with excellent dielectric constant (96) and relatively lower dielectric loss (<0.23 at 100 Hz). Furthermore, the percolation theory is explored to explain the dielectric properties of the resultant composites. It says that the percolation threshold of f MWCNTs 5 0.9 wt % and the enhancement of the dielectric constant of the composite was also discussed. In addition, the remnant polarization of the un-poled PVDF-BFO-f-MWCNTs composites (2P r 1.34 mC/cm 2 for 1.1 wt % of f-MWCNTs) is also improved. These three phase composites provide a new insight to fabricate flexible and enhanced dielectric properties as a promising application in modern electrical and electronic devices.

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“…Epoxy is an important thermoset polymer, widely used as adhesives, coatings, and for composite materials. In recent years, many research groups used CNTs as reinforcement materials in epoxy resin and studied the dispersions of nanotubes in composites because of their nanoscale diameter and outstanding mechanical properties, electrical, and thermal conductivities . The fibrous composites, especially glass fiber (GF)‐reinforced epoxy composites in which GF is the primary load‐carrying element, are being increasingly used in commercial and aerospace applications because of several desirable properties, including high strength, high flexural modulus, and low expansion rate.…”

Section: Introductionmentioning

confidence: 99%

Reinforcing Microwave Absorption Multiwalled Carbon Nanotube–Epoxy Composites Using Glass Fibers for Multifunctional Applications

Zhao

Xia

et al. 2019

Adv Eng Mater

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Herein, the enhancement of the mechanical properties of microwave absorption composites, multiwalled carbon nanotubes (MWCNTs)–epoxy with various MWCNT loadings, using glass fiber (GF) reinforcement is focused upon. The tensile strength, morphologies, dielectric permittivity, and electromagnetic (EM) wave absorption properties (in a frequency range from 1 to 26 GHz) of the composites are investigated. The tensile strength of the composites is enhanced to about 400 MPa, which is comparable with that of commercial aluminum alloy 6061 (about 300 MPa), whereas the tensile strength of the pristine MWCNT–epoxy composite is around 15 MPa. The mass density of the MWCNT–epoxy–GF composites herein is found to be around 1.6 g cm−3, whereas aluminum alloy 6061 has a mass density of ≈2.7 g cm−3. In addition, the MWCNT (9 wt%)–epoxy–GF composite presents a strong EM wave absorption in a wide frequency band from 14 to 26 GHz, whereas aluminum alloys do not have much EM wave absorption. The high microwave absorption together with the enhanced mechanical strength of the composites provides a multifunctional potential for some applications.

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Dielectric properties of surface treated multi-walled carbon nanotube/epoxy thin film composites

Cited by 58 publications

References 30 publications

Functionalization of carbon nanotubes with (3‐glycidyloxypropyl)‐trimethoxysilane: Effect of wrapping on epoxy matrix nanocomposites

Functionalization of carbon nanotubes with (3‐glycidyloxypropyl)‐trimethoxysilane: Effect of wrapping on epoxy matrix nanocomposites

COOHMWCNTs‐induced BiFeO₃‐poly(vinylidene fluoride) (PVDF) composites with enhanced dielectric and ferroelectric properties

Reinforcing Microwave Absorption Multiwalled Carbon Nanotube–Epoxy Composites Using Glass Fibers for Multifunctional Applications

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Dielectric properties of surface treated multi-walled carbon nanotube/epoxy thin film composites

Cited by 58 publications

References 30 publications

Functionalization of carbon nanotubes with (3‐glycidyloxypropyl)‐trimethoxysilane: Effect of wrapping on epoxy matrix nanocomposites

Functionalization of carbon nanotubes with (3‐glycidyloxypropyl)‐trimethoxysilane: Effect of wrapping on epoxy matrix nanocomposites

COOHMWCNTs‐induced BiFeO3‐poly(vinylidene fluoride) (PVDF) composites with enhanced dielectric and ferroelectric properties

Reinforcing Microwave Absorption Multiwalled Carbon Nanotube–Epoxy Composites Using Glass Fibers for Multifunctional Applications

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Product

Resources

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COOHMWCNTs‐induced BiFeO₃‐poly(vinylidene fluoride) (PVDF) composites with enhanced dielectric and ferroelectric properties