Development of polyurethane multiwall carbon nanotubes (MWCNTs) novel polymeric nanodielectric material

Singh, Rekha; Gaur, M. S.; Tiwari, R.K.

doi:10.1016/j.elstat.2015.05.002

Cited by 22 publications

(11 citation statements)

References 30 publications

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“…. These spectra confirm that the ε′ values of the PNC films decrease with the increase of frequency which is a common characteristic of the PNC materials . It is also revealed from Fig.…”

Section: Resultssupporting

confidence: 82%

“…But a large decrease in ε′ values over the lower frequency range on the addition of 1 wt% Al 2 O 3 nanoparticles in the polymer blend matrix is an evidence of large contribution of the nanoconfinement effect. Due to this effect the ε′ decrease with addition of inorganic nanofiller although nanofiller material has higher ε′ value as compared with that of the pristine polymer matrix . The nanoconfinement effect mainly represents the enhancement of hindrance by the nanoparticles to the motion of dipolar groups of the polymer chain with the time varying electric field due to which the dipolar polarization of the composite material reduces.…”

Section: Resultsmentioning

confidence: 99%

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Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

Choudhary

2018

Polymer Composites

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Alumina (Al2O3) nanoparticles filled poly(vinyl alcohol) (PVA) and poly(vinyl pyrrolidone) (PVP) blend matrix (50/50 wt%) based polymer nanocomposite (PNC) films (i.e., [PVA–PVP]–x wt% Al2O3; x = 0, 1, 3, and 5) have been prepared by solution‐cast method. X‐ray diffraction study has confirmed that the structures of these PNC materials are predominantly amorphous. The formation of miscible blend, polymer–polymer and polymer–nanoparticle interactions, and the effect of Al2O3 nanoparticles on the thermal properties of PVA–PVP blend matrix have been examined by Fourier transform infrared, differential scanning calorimetry and scanning electron microscopy measurements of the PNC films. The dielectric and electrical spectra of these PNC films have been measured from 20 Hz to 1 MHz using dielectric relaxation spectroscopy. It has been found that the dispersion of merely 1 wt% Al2O3 nanoparticles in the PVA–PVP blend matrix significantly reduces the crystalline phase and enhance the melting phase transition temperature of the PNC material, while the dielectric permittivity greatly decrease due to nano confinement effect. The real parts of dielectric permittivity and the impedance of these PNC films decrease linearly with the increase of the frequency, whereas the ac electrical conductivity has increased. A nonlinear increase of dielectric permittivity has been found with an increase of the temperature of PNC film and its dc electrical conductivity obeys the Arrhenius behavior. The dielectric and electrical properties of these PNC materials confirm their suitability as flexible nanodielectric of frequency tunable permittivity. POLYM. COMPOS., 39:E1788–E1799, 2018. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

Choudhary

2018

Polymer Composites

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“…The position of pristine LCPU and MWCNTs peak is very close to each other. The position of MWCNTs peak observed at 2θ = 25 as has been reported in literature [8]. LCPU/MWCNTs shows one peak around 20.42°and the pristine LCPU show diffraction peak at 2θ = 20.53° due to the presence of soft segments crystals.…”

Section: Structures Of the Pristine Mwcnt The Lcpu And The Nanocomposupporting

confidence: 79%

Carbon Nanotube Network Structure Induced Shape Memory Behavior Changes of Liquid Crystalline Polyurethane

Li¹,

Lian²,

Wei³

et al. 2015

Proceedings of the 2015 International Symposium on Material, Energy and Environment Engineering

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Liquid crystalline polyurethane (LCPU) was used to develop shape memory nanocomposites. The carbon nanotubes were introduced by melt mixing to improve the shape memory property of the LCPU matrix. The dispersion of CNTs and shape memory behaviours of the nanocomposites were also studied. The XRD shows that the CNTs have a good dispersion in the LCPU matrix. The nanocomposites shows a better recovery ratio with the CNTs increase.

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“…Singh et al [329] developed PU-MWNT nanocomposite thin films with enhanced dielectric properties using a solution grown method. As a result of a proper dispersion of the nanotubes throughout the PU matrix, facilitated by using an initially liquid system, the resulting nanocomposites displayed enhanced electrical conductivities with a characteristic percolative behaviour.…”

Section: Effect Of Nanoparticle Dispersion By Means Of Processingmentioning

confidence: 99%

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

Abbasi

Antunes

Velasco

2019

Progress in Materials Science

594

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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Development of polyurethane multiwall carbon nanotubes (MWCNTs) novel polymeric nanodielectric material

Cited by 22 publications

References 30 publications

Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

Structural, morphological, thermal, dielectric, and electrical properties of alumina nanoparticles filled PVA–PVP blend matrix‐based polymer nanocomposites

Carbon Nanotube Network Structure Induced Shape Memory Behavior Changes of Liquid Crystalline Polyurethane

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

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