Polypropylene/carbon nanotube nano/microcellular structures with high dielectric permittivity, low dielectric loss, and low percolation threshold

Ameli, Amir; Nofar, Mohammadreza; Park, Chul; Pötschke, Petra; Rizvi, Ghaus

doi:10.1016/j.carbon.2014.01.031

Cited by 372 publications

(270 citation statements)

References 58 publications

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“…In particular, concurrent mechanisms have been reported to play a role on the percolation behavior [26], specifically the biaxial stretching occurring during foaming was observed to cause the CNTs to slightly orient around the pores, while the pore-to-pore compression forced them to decrease their distance. This action increased the CNTs' interconnections and thereby increased the electrical conductivity and reduced the percolation value.…”

Section: Electrical Percolation In Hybrid Systemsmentioning

confidence: 99%

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

Maxian¹,

Pedrazzoli²,

Manas‐Zloczower³

2017

Express Polym. Lett.

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Abstract.A new numerical model considering nanofiller random distribution in a porous polymeric matrix was developed to predict electrical percolation behavior in systems incorporating 1D-carbon nanotubes (CNTs) and/or 2D-graphene nanoplatelets (GNPs). The numerical model applies to porous systems with closed-cell morphology. The percolation threshold was found to decrease with increasing porosity due to filler repositioning as a result of foaming. CNTs were more efficient in forming a percolative network than GNPs. High-aspect ratio (AR) and randomly oriented fillers were more prone to form a network. Reduced percolation values were determined for misaligned fillers as they connect better in a network compared to aligned ones. Hybrid CNT-GNP fillers show synergistic effects in forming electrically conductive networks by comparison with single fillers.

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Section: Electrical Percolation In Hybrid Systemsmentioning

confidence: 99%

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

Maxian¹,

Pedrazzoli²,

Manas‐Zloczower³

2017

Express Polym. Lett.

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“…In addition, the mechanical and electrical properties of polyethylene such as tensile strength, resistivity, permittivity and dielectric loss, breakdown strength, and space charge behaviors can be enhanced by adding inorganic nanoparticles due to its small size and surface effect; the polyethylene/inorganic nanoparticles nanocomposites are regarded as a promising candidate for high voltage direct current cables in the future [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Wang

Xiao

et al. 2017

Journal of Nanomaterials

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The ability of antithermal aging of LDPE/TiO 2 nanocomposites was investigated through SEM, FTIR, DSC, and dielectric properties in this paper. The results of SEM images showed that the thermal aging had a significant influence on the structure of Pure-LDPE and LDPE/TiO 2 samples. The measurement of FTIR showed that the content of hydroxyl and carboxyl increased with thermal aging, but the time of emerging aging characteristic peaks for the LDPE/TiO 2 samples was delayed. The DSC measurement indicated that filling TiO 2 nanoparticles changed the crystallization behavior of LDPE, played a role of heterogeneous nucleation during the process of recrystallization, and improved the crystallinity of LDPE/TiO 2 . Similarly, the aged LDPE/TiO 2 samples had lower permittivity and dissipation factor compared to the aged Pure-LDPE samples. All the results had indicated the LDPE/TiO 2 samples had the significant ability of antithermal aging, especially the LDPE/TiO 2 -0.5 samples with good dispersion of nanoparticles. A new model was proposed to illustrate the antithermal aging behaviors of LDPE/TiO 2 samples, which shows that the TiO 2 nanoparticles play a role of "crosslinking points" between LDPE molecular chains, increasing the density of crystal structure and reducing oxygen diffusion into materials to break molecular structure.

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“…However in the composite foams prepared in 1-step, this behavior was not observed. It is well known that the addition of fillers will increase the dielectric permittivity [60][61]. It is possible to state that the enhanced EMI SE is strongly related to the improvement observed in dielectric constant (see Figures 6 and 7).…”

Section: Electromagnetic Interference Shielding Effectivenessmentioning

confidence: 86%

Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process

et al. 2016

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Abstract:The dielectric and electromagnetic interference (EMI) shielding properties of polycarbonate/graphene nanocomposites foamed using supercritical carbon dioxide were studied as a function of their cellular and composite morphology. Foamed polycarbonate filled with 0.5% (by weight) graphene exhibited enhanced EMI shielding effectiveness, which was found to depend on cellular and composite morphology in a complex manner.Foamed composites presented a maximum specific EMI shielding effectiveness of ~39 dB.cm 3 /g, which is approximately 35 times greater than that of unfoamed composite (1.1 dB.cm 3 /g). In addition, the relative permittivity was found to increase up to 3.25 times. The results suggest that graphene filled polymer foams can enhance the performance of electronic devices, opening up the possibility of using these materials in electronic applications.

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Polypropylene/carbon nanotube nano/microcellular structures with high dielectric permittivity, low dielectric loss, and low percolation threshold

Cited by 372 publications

References 58 publications

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites

Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process

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Polypropylene/carbon nanotube nano/microcellular structures with high dielectric permittivity, low dielectric loss, and low percolation threshold

Cited by 372 publications

References 58 publications

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

Research on the Thermal Aging Behaviors of LDPE/TiO2 Nanocomposites

Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process

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Research on the Thermal Aging Behaviors of LDPE/TiO₂ Nanocomposites