Dielectric relaxation behavior of three-phase MWCNTs-PANI polystyrene nanocomposites

Farrag, Emad Am

doi:10.1177/0892705718797159

Cited by 8 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Its relaxation frequency as well as dielectric absorption increased with increasing SWCN admixture in the Ecoflex ® polymer matrix. A similar process was observed for MWCN with PANI hybrid systems in a polystyrene matrix and was identified as conduction relaxation [ 38 ]. Temperature dependence of the dielectric response of the Ecoflex ® :SWCN hybrid layer was also studied.…”

Section: Resultssupporting

confidence: 57%

Comparison of the Dielectric Properties of Ecoflex® with L,D-Poly(Lactic Acid) or Polycaprolactone in the Presence of SWCN or 5CB

et al. 2021

View full text Add to dashboard Cite

The main goal of this paper was to study the dielectric properties of hybrid binary and ternary composites based on biodegradable polymer Ecoflex®, single walled carbon nanotubes (SWCN), and liquid crystalline 4′-pentyl-4-biphenylcarbonitrile (5CB) compound. The obtained results were compared with other created analogically to Ecoflex®, hybrid layers based on biodegradable polymers such as L,D-polylactide (L,D-PLA) and polycaprolactone (PCL). Frequency domain dielectric spectroscopy (FDDS) results were analyzed taking into consideration the amount of SWCN, frequency, and temperature. For pure Ecoflex®, two relaxation processes (α and β) were identified. It was shown that the SWCN admixture (in the weight ratio 10:0.01) did not change the properties of the Ecoflex® layer, while in the case of PCL and L,D-PLA, the layers became conductive. The dielectric constant increased with an increase in the content of SWCN in the Ecoflex® matrix and the conductive behavior was not visible, even for the greatest concentration (10:0.06 weight ratio). In the case of the Ecoflex® polymer matrix, the conduction relaxation process at a frequency ca. several kilohertz appeared and became stronger with an increase in the SWCN admixture in the matrix. Addition of oleic acid to the polymer matrix had a smaller effect on the increase in the dielectric response than the addition of liquid crystal 5CB. Fourier transform infrared (FTIR) results revealed that the molecular structure and chemical character of the Ecoflex® and PCL matrixes remained unchanged upon the addition of SWCN or 5CB in a weight ratio of 10:0.01 and 10:1, respectively, while molecular interactions appeared between L,D-PLA and 5CB. Moreover, adding oleic acid to pure Ecoflex® as well as the binary and ternary hybrid layers with SWCN and/or 5CB in a weight ratio of Ecoflex®:oleic acid equal to 10:0.3 did not have an influence on the chemical bonding of these materials.

show abstract

Section: Resultssupporting

confidence: 57%

Comparison of the Dielectric Properties of Ecoflex® with L,D-Poly(Lactic Acid) or Polycaprolactone in the Presence of SWCN or 5CB

et al. 2021

View full text Add to dashboard Cite

show abstract

“…112–116 The nanofiller like multiwalled carbon nanotubes are outstanding fillers having excellent characteristics of physical features, hence they are generally used for polymer-based nanocomposites for obtaining required properties. 117–119…”

Section: Polyaniline (Pani)-based Emi Shielding Materialsmentioning

confidence: 99%

“…[112][113][114][115][116] The nanofiller like multiwalled carbon nanotubes are outstanding fillers having excellent characteristics of physical features, hence they are generally used for polymer-based nanocomposites for obtaining required properties. [117][118][119] Saini et al synthesized polyaniline coated multiwalled carbon nanotube through in situ oxidative polymerization. The polyaniline/multiwalled carbon nanotube nanocomposites were contained a better conductivity value of (19.7 S /cm) than pure polyaniline (2.0 S cm À1 ) and multiwalled carbon nanotube (19.1 S cm À1 ).…”

Section: Polyaniline-based Carbon Nanocompositesmentioning

confidence: 99%

Polyaniline-based nanocomposites for electromagnetic interference shielding applications: A review

Zahid

Anum

Siddique

et al. 2021

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

Based on recent advancements, the emission of electromagnetic radiation has become a serious issue of electromagnetic interferences. These electromagnetic interferences comprise of various undesirable emission of radiation that can create unwanted deprivation of equipment or structure performance. If these complications remain unresolved can create extreme damage to the security operation or communication system of several electronic devices. Various studies have been made to resolve these problems. In past years, electrically conductive polyaniline has attained a unique position due to the prosperity of its features. The absorption of microwave and EMI shielding characteristics of the electrically conductive polyaniline can be described in the relation of great electrical conductivity with strong relaxation and, polarization effects due to the existence of stronger bonds or localized charges. In the present article, the advancement in electromagnetic interference shielding with the use of nanosized polyaniline particles and their derivative nanocomposites is discussed by various parameters such as the size of the particle, absorption properties, magnetic properties, reflective properties, electrical conductivities, and dielectric properties. The electromagnetic absorption performance of conducting polyaniline nanocomposites associated with dielectric nanomaterials (graphene) and magnetic materials (γ-Fe2O3) are widely discussed. The most appropriate polyaniline-based nanocomposites can be identified by this context. Due to increasing demand of electrically conductive polyaniline for shielding materials, it is considered to be review for better understanding in advancement. This article presents recent electromagnetic interference shielding materials knowledge of nanosized polyaniline and their nanocomposites as well as their possibilities and challenges.

show abstract

“…It can be inferred from the peak in tanδ values that pristine PBz performed viscoelastic relaxation because of dipolar relaxation, in which these dipoles were permanent dipoles present on the side chains of the polymer backbone [ 40 ] When the filler loading reached 25 wt%, the relaxation behavior was extremely obvious, which resulted from the combination of viscoelastic relaxation and conductivity relaxation, which was due to translational diffusion of ions that caused conduction [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Achieving a 3D Thermally Conductive while Electrically Insulating Network in Polybenzoxazine with a Novel Hybrid Filler Composed of Boron Nitride and Carbon Nanotubes

Wang

Drummer

et al. 2020

Polymers

View full text Add to dashboard Cite

To solve the problem of excessive heat accumulation in the electronic packaging field, a novel series of hybrid filler (BN@CNT) with a hierarchical “line-plane” structure was assembled via a condensation reaction between functional boron nitride(f-BN) and acid treated carbon nanotubes (a-CNTs). The reactions with different mass ratios of BN and CNTs and the effect of the obtained hybrid filler on the composites’ thermal conductivity were studied. According to the results, BN@15CNT exhibited better effects on promoting thermal conductivity of polybenzoxazine(PBz) composites which were prepared via ball milling and hot compression. The thermally conductive coefficient value of PBz composites, which were loaded with 25 wt% of BN@15CNT hybrid fillers, reached 0.794 W· m−1· K−1. The coefficient value was improved to 0.865 W· m−1· K−1 with 15 wt% of BN@15CNT and 10 wt% of BN. Although CNTs were adopted, the PBz composites maintained insulation. Dielectric properties and thermal stability of the composites were also studied. In addition, different thermal conduction models were used to manifest the mechanism of BN@CNT hybrid fillers in enhancing thermal conductivity of PBz composites.

show abstract

Dielectric relaxation behavior of three-phase MWCNTs-PANI polystyrene nanocomposites

Cited by 8 publications

References 24 publications

Comparison of the Dielectric Properties of Ecoflex® with L,D-Poly(Lactic Acid) or Polycaprolactone in the Presence of SWCN or 5CB

Comparison of the Dielectric Properties of Ecoflex® with L,D-Poly(Lactic Acid) or Polycaprolactone in the Presence of SWCN or 5CB

Polyaniline-based nanocomposites for electromagnetic interference shielding applications: A review

Achieving a 3D Thermally Conductive while Electrically Insulating Network in Polybenzoxazine with a Novel Hybrid Filler Composed of Boron Nitride and Carbon Nanotubes

Contact Info

Product

Resources

About