Dielectric Spectroscopy of Polymer-Based Nanocomposite Dielectrics with Tailored Interfaces and Structured Spatial Distribution of Fillers

Polizos, Georgios; Tuncer, Enis; Tomer, V.; Sauers, I.; Randall, Clive A.; Manias, Evangelos

doi:10.1201/9781315216003-3

Cited by 11 publications

(13 citation statements)

References 61 publications

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“…In general, transport processes in solids, especially in complex structured polymers, depend on their internal morphology, as well as on the influence of important physical properties. The dielectric function

depends on several variables, such as temperature, frequency, the molecular mobility within the material, the macroscopic orientation of the polymer chains, electromagnetic fields and the applied mechanical loads, including pressure and tensile stresses [ 38 ]. The viscoelastic properties of the chain reflect a particular average of the chain conformation, i.e., the isochronal orientational anisotropy of individual entanglement segments.…”

Section: Methodsmentioning

confidence: 99%

Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications

et al. 2017

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The linear and nonlinear oscillatory shear, extensional and combined rheology-dielectric spectroscopy of hybrid polymer nanocomposites for semiconductive applications were investigated in this study. The main focus was the influence of processing conditions on percolated poly(ethylene-butyl acrylate) (EBA) nanocomposite hybrids containing graphite nanoplatelets (GnP) and carbon black (CB). The rheological response of the samples was interpreted in terms of dispersion properties, filler distortion from processing, filler percolation, as well as the filler orientation and distribution dynamics inside the matrix. Evidence of the influence of dispersion properties was found in linear viscoelastic dynamic frequency sweeps, while the percolation of the nanocomposites was detected in nonlinearities developed in dynamic strain sweeps. Using extensional rheology, hybrid samples with better dispersion properties lead to a more pronounced strain hardening behavior, while samples with a higher volume percentage of fillers caused a drastic reduction in strain hardening. The rheo-dielectric time-dependent response showed that in the case of nanocomposites containing only GnP, the orientation dynamics leads to non-conductive samples. However, in the case of hybrids, the orientation of the GnP could be offset by the dispersing of the CB to bridge the nanoplatelets. The results were interpreted in the framework of a dual PE-BA model, where the fillers would be concentrated mainly in the BA regions. Furthermore, better dispersed hybrids obtained using mixing screws at the expense of filler distortion via extrusion processing history were emphasized through the rheo-dielectric tests.

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Section: Methodsmentioning

confidence: 99%

Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications

et al. 2017

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“…Characterization of frequency and temperature dependent dielectric and electrical properties of the polymer nanocomposite (PNC) materials has been one of the intense areas of research in the advances of materials science and engineering . These PNC materials are broadly used as flexible nanodielectric substrate and an electrical insulator for the organic thin film transistors , transient electronic antennas , packaging for electronic devices , electromagnetic pollution and interference shielding , as a base matrix for the preparation of optoelectronic devices , sensors , and solid‐state energy storage and conversion devices .…”

Section: Introductionmentioning

confidence: 99%

“…The PNC materials comprise most of the useful properties of inorganic nanofiller and the host polymer matrix. The electrostatic interactions between the nanoparticles and the functional groups of the polymer chain, and also their physical interfaces play an important role in the settlement of dielectric, electrical, and physicochemical properties of the PNCs . For several PNC materials, their dielectric and electrical properties can be tailored by selecting a suitable dielectric permittivity value polymer matrix, inorganic nanofiller and its electronic nature of surface, concentration of polymer and filler in the composition, and also the use of an appropriate nanocomposite preparation method.…”

Section: Introductionmentioning

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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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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“…1,2 This is because unlike their conventional polymer counterparts, polymer nanocomposites exhibit augmented, mechanical, electric and physical attributes, particularly at lower nanofiller concentrations of 1%-4%. [3][4][5] Nevertheless, these polymer nanocomposites' electric properties have only been investigated in the recent past and the findings of rather limited research conducted have been very encouraging. 6 More precisely, substantial improvements have been observed in numerous physical properties, such as mechanical and electric properties as opposed to similar properties in conventional polymers.…”

Section: Introductionmentioning

confidence: 99%

Role of copper oxide nanoparticles and gamma irradiation in optimising mechanical and the DC-electrical properties of nylon 66

Abdeldaym

Elhady

2020

Journal of Composite Materials

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This study used an aqueous precipitation method to synthesise copper oxide (CuO) nanoparticles. Nylon 66/CuO-based nanocomposites were prepared through a melt-mixing process using CuO nanoparticles with differing contents (1, 2, 3 and 4 wt%) and varying doses of gamma radiation (100, 200 and 300 kGy). The study also investigated the impact of these combinations on the structural, mechanical and DC-electrical attributes of nylon 66. The combination of CuO nanoparticles and gamma irradiation caused nylon 66 to undergo structural changes verified through X-ray diffraction measurement and Fourier-transform infrared spectroscopy. Scanning electron microscopy was used to examine the morphology of the nylon 66/CuO nanocomposites and revealed that the CuO nanoparticles belonging to the nylon 66 matrixes had a homogeneous dispersion. According to the mechanical finding, the influence of CuO nanoparticles and gamma irradiation significantly augmented the flexural strength and flexural modulus of the nanocomposites. However, this addition led to a decline of elongation at break. To better understand the tensile mechanism, a correlation of tensile strength using theoretical models premised on Money, Einstein and Pukanszky were undertaken. The optimal deviation was exhibited by the Pukanszky model using tensile plots on an experimental basis. The study also examined the nanocomposite’s DC-electrical conductivity; electrical conductivity increased with CuO nanoparticle content and gamma irradiation. For every sample, the prevailing transport mechanism was the Poole–Frenkel emission. This finding is encouraging for the development of innovative materials with augmented tensile strength and nanoelectronic devices.

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Dielectric Spectroscopy of Polymer-Based Nanocomposite Dielectrics with Tailored Interfaces and Structured Spatial Distribution of Fillers

Cited by 11 publications

References 61 publications

Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications

Linear and Nonlinear Rheology Combined with Dielectric Spectroscopy of Hybrid Polymer Nanocomposites for Semiconductive Applications

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

Role of copper oxide nanoparticles and gamma irradiation in optimising mechanical and the DC-electrical properties of nylon 66

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