Dielectric spectroscopy of high aspect ratio graphene-polyurethane nanocomposites

Jan, Rahim; Habib, Amir; Abbassi, Hina; Amir, Shahid

doi:10.1007/s13391-014-4265-5

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…Similar results have been found when using graphene or graphene-based materials [331][332][333]. Jan and co-workers [331] considered the preparation of TPU nanocomposites containing high aspect ratio graphene nanosheets, GNS (up to a graphene concentration of 0.55 vol%), previously prepared by liquid exfoliation, and showed that, result of the homogeneous dispersion of said nanosheets within the TPU matrix the nanocomposites displayed conductivities that were 10 to 1000 times higher and dielectric constants 5 to 6 times higher at 100 Hz when compared to the unfilled TPU. The authors related these spectacular increases to interfacial and orientation polarization effects directly resulting from the well-exfoliated and dispersed GNS.…”

Section: Effect Of Nanoparticle Dispersion By Means Of Processingsupporting

confidence: 88%

Recent advances in carbon-based polymer nanocomposites for electromagnetic interference shielding

Abbasi

Antunes

Velasco

2019

Progress in Materials Science

590

274

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Carbon-based nanoparticles have recently generated a great attention, as they could create polymer nanocomposites with enhanced transport properties, overcoming some limitations of electrically-conductive polymers for high demanding sectors. Particular importance has been given to the protection of electronic components from electromagnetic radiation emitted by other devices. This review considers the recent advances in carbon-based polymer nanocomposites for electromagnetic interference (EMI) shielding. After a revision of the types of carbon-based nanoparticles and respective polymer nanocomposites and preparation methods, the review considers the theoretical models for predicting the EMI shielding, divided in those based on electrical conductivity, models based on the EMI shielding efficiency, on the so-called parallel resistor-capacitor model and those based on multiscale hybrids. Recent advances in the EMI shielding of carbon-based polymer nanocomposites are presented and related to structure and processing, focusing on the effects of nanoparticle's aspect ratio and possible functionalization, dispersion and alignment during processing, as well as the *Manuscript 2 use of nanohybrids and 3D reinforcements. Examples of these effects are presented for nanocomposites with carbon nanotubes/nanofibres and graphene-based materials. A final section is dedicated to cellular nanocomposites, focusing on how the resulting morphology and cellular structures may generate lightweight multifunctional nanocomposites with enhanced absorption-based EMI shielding properties.

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Section: Effect Of Nanoparticle Dispersion By Means Of Processingsupporting

confidence: 88%

Recent advances in carbon-based polymer nanocomposites for electromagnetic interference shielding

Abbasi

Antunes

Velasco

2019

Progress in Materials Science

590

274

View full text Add to dashboard Cite

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“…Various types of nanofillers like ferroelectric ceramics, layered silicates, carbon nanotubes (CNTs), grapheme, etc. are embedded in the different types of polymer matrices to tailor the properties [12][13][14][15][16][17][18][19][20][21]. However, limitation occurs due to the increase in one set of properties at the expense of other set of properties, e.g., higher dielectric properties are originated at the expense of low mechanical performance for higher loading levels of nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Investigating mechanical, dielectric, and electromagnetic interference shielding properties of polymer blends and three component hybrid composites based on polyvinyl alcohol, polyaniline, and few layer graphene

Khan

Saboor

et al. 2017

Polymer Composites

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To achieve the suitable set of synergistic mechanical, dielectric, and electromagnetic interference shielding properties, polymer blends based on varying the concentration of conductive polymer polyaniline (PANI) in insulative matrix of polyvinyl alcohol (PVA) as well as hybrid composites by adding few layer graphene (FLG) in PVA/PANI polymer blends are prepared using solution casting method. In PVA/PANI blends, by increasing the concentration of PANI, dielectric constant (ε′), dielectric loss (ε″), and total shielding efficiency (SET) of PVA are enhanced from 4 to 80, 0.72 to 164, and 2.5 to 30 dB at 100 Hz, respectively, at the considerable loss of its mechanical properties particularly the tensile strength from 23.9 to 8.5 MPa. For hybrid composites of PVA/PANI/FLG, mechanical as well as dielectric and EMI shielding properties are remarkably enhanced at very low loading levels of FLG. The incorporation of small amounts of FLG in PVA/PANI‐10 wt%, the ε′, ε″, and SET are increased from 4 to 7,907, 0.5 to 406,947.5 and 2.5 to 99 dB at 100 Hz, respectively, along with the considerable increase in the mechanical properties such as tensile strength from 15.7 to 36.3 MPa and modulus from 0.1 to 0.96 GPa at the loss of strain. In comparison to PVA/PANI blends, hybrid composites of PVA/PANI/FLG become a promising system for microwave absorption applications. POLYM. COMPOS., 39:3686–3695, 2018. © 2017 Society of Plastics Engineers

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“…The dissipation D and capacitance C were measured as a function of frequency (100 Hz to 5 MHz). Dielectric behavior is represented in terms of real ( ε ′) and imaginary ( ε ″) parts of dielectric permittivity, calculated from complex permittivity [46] represented as…”

Section: Resultsmentioning

confidence: 99%

PS/PANI/MoS2 Hybrid Polymer Composites with High Dielectric Behavior and Electrical Conductivity for EMI Shielding Effectiveness

et al. 2019

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Liquid exfoliated molybdenum disulfide (MoS2) nanosheets and polyaniline (PANI) nanoparticles are dispersed in polystyrene (PS) matrix to fabricate hybrid polymer composites with high dielectric and electromagnetic interference (EMI) shielding behavior. A phase-separated morphology is formed when PANI and MoS2 are incorporated into polystyrene (PS) matrix. An increasing concentration of MoS2 nanoparticles inside PS/PANI (5 wt %) polymer blend forms an interconnected network, resulting in high electrical conductivity and dielectric behavior, making them a suitable candidate for EMI shielding application. An increment in dielectric constant and loss, up to four and five orders of magnitude, respectively, is recorded at a maximum concentration of 1 wt % of MoS2 in PS/PANI-5 polymer blend at 100 Hz. The enhanced dielectric characteristics for PS/PANI/MoS2 composites are then theoretically evaluated for the estimation of EMI shielding effectiveness in the frequency range of 100 Hz to 5 MHz. The maximum dielectric constant and loss achieved for PS/PANI-5 wt %/MoS2-1 wt % are responsible for estimated shielding effectiveness of around 92 dB at 100 Hz. The increase in dielectric behavior and shielding effectiveness is probably due to the increased number of charged dipoles accumulated at the insulator–conductor interface.

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Dielectric spectroscopy of high aspect ratio graphene-polyurethane nanocomposites

Cited by 12 publications

References 26 publications

Recent advances in carbon-based polymer nanocomposites for electromagnetic interference shielding

Recent advances in carbon-based polymer nanocomposites for electromagnetic interference shielding

Investigating mechanical, dielectric, and electromagnetic interference shielding properties of polymer blends and three component hybrid composites based on polyvinyl alcohol, polyaniline, and few layer graphene

PS/PANI/MoS2 Hybrid Polymer Composites with High Dielectric Behavior and Electrical Conductivity for EMI Shielding Effectiveness

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