Impedance study of polymethyl methacrylate composites/multi-walled carbon nanotubes (PMMA/MWCNTs)

Khattari, Z. Y.; Maghrabi, M.; McNally, Tony; Jawad, S. Abdul

doi:10.1016/j.physb.2011.12.019

Cited by 29 publications

(30 citation statements)

References 27 publications

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“…Microcapacitors are composed of two nanofillers and the insulating polymer between them. Adding more microcapacitors results in the higher real permittivity . However, decreasing distance between MWCNTs reduces the interfacial potential energy, so that the localized charge carriers could jump more readily.…”

Section: Resultsmentioning

confidence: 99%

Enhancing electrical properties of MWCNTs in immiscible blends of poly(methyl methacrylate) and styrene‐acrylonitrile copolymer by selective localization

Sarvi

Sundararaj

2014

Polymer Composites

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Multiwalled carbon nanotubes (MWCNTs) were introduced into poly(methyl methacrylate) (PMMA) and styrene‐acrylonitrile copolymer (SAN) blends by melt mixing in an asymmetric miniature mixer (APAM). A composition of 70 wt% of PMMA and 30 wt% of SAN was mixed to create a co‐continuous morphology. Transmission electron microscopy images of ultra‐microtomed samples (70 nm in thickness) showed selective localization of MWCNTs inside the percolated SAN phase. The occurrence of the double percolation phenomenon resulted in lower electrical percolation thresholds of PMMA/SAN/MWCNT blends molded at high temperatures. Dielectric spectroscopy indicated a higher electrical permittivity for samples that were compression molded at 260°C. Due to the higher affinity of MWCNTs to SAN, there was a migration of MWCNTs into the SAN phase during the melt processing. Conductivity measurements revealed a significant decrease in electrical percolation threshold (0.4 wt%) for PMMA70/SAN30 blends compared with MWCNT‐filled SAN and MWCNT‐filled PMMA (ca. 0.8 wt%). POLYM. COMPOS., 37:1523–1530, 2016. © 2014 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Enhancing electrical properties of MWCNTs in immiscible blends of poly(methyl methacrylate) and styrene‐acrylonitrile copolymer by selective localization

Sarvi

Sundararaj

2014

Polymer Composites

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“…The dielectric constant of the composites increases remarkably with the increasing CNTs concentration, at CNTs concentration close to percolation threshold [21]. This may be attributed to the critical behavior of the dielectric constant near the percolation threshold as well as the polarization effects between the clusters inside the compound.…”

Section: Dielectric Properties and Ac Conductivitymentioning

confidence: 88%

“…The real part of AC conductivity of samples has been calculated by the dielectric loss according to the relation, σ = ԑ0ωԑ"+i ԑ0ωԑ′, where ԑ′and ԑ" are the dielectric constant and loss, respectively [21]. The real part of σ AC is calculated by the equation,…”

Section: Methodsmentioning

confidence: 99%

“…1-b, is the critical exponent in the insulating region. The transition from an insulating to a conducting composite as a function of filler loading can only happen when the fillers were able to build a three dimensional network that facilitates electron hopping or tunneling [21]. Figure 4 shows the DC conductivity of the compound versus wt.…”

Section: Electrical Properties -Dc Conductivitymentioning

confidence: 99%

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The effects of carbon nano tubes on electric and dielectric properties of CNTs doped KBr (CNTs/KBr) compound

Dadras

Farahani

2015

Physica B: Condensed Matter

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“…Since the conductivity of CNTs-based composites depends strongly on their structure, the method of impedance spectroscopy is considered to be a useful tool for the detailed characterization of electrical properties of such materials 6,7 . The most important advantage of the impedance spectroscopy as applied to composite materials is that it enables one to separate the contributions of conduction mechanisms associated with the charge transport within the particles (nanotubes) and between them.…”

Section: Introductionmentioning

confidence: 99%

Impedance Spectroscopy Study of Carbon Nanotube–Glass Microfiber Composites

Волков¹,

Varfolomeev²,

Krasnoselsky³

et al. 2016

Orient. J. Chem

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The method of fabricating composites composed of a glass microfiber matrix and the conductive nanofibers is proposed. The nanofibers incorporating single-walled carbon nanotubes (SWCNTs) and an organic material are spread over the surface of glass microfibers and in some areas between microfibers are coupled together into a branched network. The contributions of intra-CNT and inter-CNT conduction mechanisms in the composites with different contents of SWCNTs are evaluated from the analysis of their impedance spectra. The crossover between two conduction mechanisms is observed at a content of SWCNTs of about 0.1 wt. %.

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Impedance study of polymethyl methacrylate composites/multi-walled carbon nanotubes (PMMA/MWCNTs)

Cited by 29 publications

References 27 publications

Enhancing electrical properties of MWCNTs in immiscible blends of poly(methyl methacrylate) and styrene‐acrylonitrile copolymer by selective localization

Enhancing electrical properties of MWCNTs in immiscible blends of poly(methyl methacrylate) and styrene‐acrylonitrile copolymer by selective localization

The effects of carbon nano tubes on electric and dielectric properties of CNTs doped KBr (CNTs/KBr) compound

Impedance Spectroscopy Study of Carbon Nanotube–Glass Microfiber Composites

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