Electric Modulus Spectroscopic Studies of the Dielectric Properties of Carbon Nanotubes/Epoxy Polymer Composite Materials

Boukheir, Sofia; Samir, Z.; Belhimria, R.; Kreit, L.; Achour, M. E.; Éber, Nándor; Costa, Liliana Vale; Oueriagli, A.; Outzourhit, A.

doi:10.1080/00222348.2018.1439243

Cited by 23 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To describe the effect of the polarization of the electrode and solve the relaxation at low frequencies, the term “electric modulus” was used. The electric modulus was introduced by McCrum et al [ 37 ] and is used for the study of electrical relaxation phenomena in many polymers [ 38 , 39 , 40 , 41 ] and has been used for the present dielectric characterization and analysis. Electrical Modulus is defined by Equation (1), where M ′ and M ″ are, the real and imaginary part of the electrical modulus.…”

Section: Dielectric Test Resultsmentioning

confidence: 99%

Study Analysis of Thermal, Dielectric, and Functional Characteristics of an Ethylene Polyethylene Diene Monomer Blended with End-of-Life Tire Microparticles Amounts

et al. 2021

View full text Add to dashboard Cite

The recycling and disposal of disused tires is a topic of great concern to today’s companies, researchers, and society in general. In this sense, our research aims to recycle end-of-life tires (GTRs) through the separation of the fraction of vulcanized rubber from the other compounds in order to later grind this fraction and separate it into lower particle sizes. Finally, we aim to incorporate these GTR particles as a filler of an ethylene-polyethylene-diene monomer (EPDM). The obtained composites with EPDM and GTR are tested (5%, 10%, 20%) comparing these values with neat EPDM as a control sample. Thermal tests such as differential calorimetry (DSC) and thermogravimetric analysis (TGA) as well as dielectric tests (DEA) are performed in order to characterize these materials and check their viability as dielectric or semiconductor, for industrial use. It is checked how the presence of GTR increases functional properties such as conductivity/permittivity. The influence of temperature (40 to 120 °C) and addition of GTR particles in electrical properties has also been analyzed. The dielectric behavior of these composites is fully characterized, analyzing the different types of relaxation with increasing frequency (10 mHz to 3 MHz), using the electric modulus, and Argand diagrams among other measures. The influence of GTR and temperature in the dielectric and thermal behavior of these materials has been analyzed, where CB of GTR creates interfacial polarization phenomena in the dielectric behavior of the composite and increases the permittivity (real and imaginary) as well as the conductivity. Finally, with these obtained properties, the possible application of EPDM/GTR composites as industrial dielectrics has been studied.

show abstract

Section: Dielectric Test Resultsmentioning

confidence: 99%

Study Analysis of Thermal, Dielectric, and Functional Characteristics of an Ethylene Polyethylene Diene Monomer Blended with End-of-Life Tire Microparticles Amounts

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Electrochemical modulus spectroscopy (MS) as derived from impedance spectroscopy has been widely used to investigate the dielectric behavior and charge-carrier relaxation mechanism in the SC, polycrystalline, and amorphous oxide materials. − Previously, Wang et al investigated the dielectric properties of Ta-doped La 2 Ti 2 O 7 SC over a wide temperature range from 0–300 °C and in the frequency range of 10 2 to 10 5 Hz . Kim et al reported the MS of potassium lithium niobate (KLN) crystals in the frequency range from 100 Hz to 10 MHz and temperature range from 30 to 600 °C and showed that the dielectric relaxation behavior is fitted to the Kohlrausch–Williams–Watts exponential function .…”

Section: Introductionmentioning

confidence: 99%

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Tailor

Satapathi

2021

J. Phys. Chem. C

View full text Add to dashboard Cite

Photosensitive dielectric and conductivity relaxation was observed in all inorganic lead-free Cs3Bi2Cl9 perovskite single crystals. Using impedance and modulus spectroscopy in dark and with subsequent light-on and -off conditions, a reversible shift in modulus peak frequencies was observed. Relevant phenomenological methods based on modified Cole–Cole- and Debye-type relaxation models were applied to analyze the light-sensitive dielectric and conductivity behavior. The detailed analysis of this reversible change in modulus spectra confirms the light-induced trap-assisted reversible dipolar relaxation phenomena in Cs3Bi2Cl9 crystals. The conductivity follows Jonscher’s power law, and the value of power “n” was found to be ∼1, which further validates the Debye-type relaxation process. Our study provides an in-depth understanding and new insights into the dielectric and conductivity relaxation mechanism in perovskite single crystals, which motivates the future design of the perovskite single crystal-based energy storage devices.

show abstract

“…Is expected that carbon black (CB) in the GTR particles may affect the conductive process in the polymeric composites (LLDPE + GTR) [33], affecting electrical insulation properties. Other research [34][35][36] studied the dielectric properties of composite polymers, depending on frequency and temperature. The Maxwell-Wagner-Sillars (MWS) interface polarization theory is observed in heterogeneous systems composed of two or more phases.…”

Section: Introductionmentioning

confidence: 99%

Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Marín-Genescà¹,

García-Amorós²,

Mujal-Rosas³

et al. 2020

Polymers

View full text Add to dashboard Cite

The waste rubber vulcanizate, on account of its stable, cross-linked and three-dimensional structural arrangement, is difficult to biodegrade. Thus, the ever-increasing bulk of worn-out tires is a serious environmental issue and its safe disposal is still a challenging task reported widely by the scientific community. The rubber materials, once they end their useful life, may present difficulties to be reused or recycled. At present, only one tire recycling method is used, which involves grinding and separating steel and fibers from vulcanized rubber, and then using rubber for industrial applications, such as flooring, insulation, footwear. In this paper, a new compound material is presented from a base of reused tire powder (Ground Tire Rubber: GTR) as a mixer and linear low-density polyethylene (LLDPE) as a matrix. The reused tire powder, resulting from grinding industrial processes, is separated by sieving into just one category of particle size (<200 μm) and mixed with the LLDPE in different amounts (0%, 5%, 10%, 20%, 40%, 50% and 70% GTR). Due to the good electrical properties of the LLDPE, this study’s focus is settled on the electrical behavior of the obtained composites. The test of the dielectric behavior is carried out by means of DEA test (Dynamic Electric Analysis), undertaken at a range of temperatures varying from 30 to 120 °C, and with a range of frequencies from 1 to 102, to 3·106 Hz, from which permittivity, conductivity, dielectric constant and electric modulus have been obtained. From these experimental results and their analysis, it can be drawn that the additions of different quantities of GTR to LLDPE could be used as industrial applications, such as universal electrical cable joint, filler for electrical applications or cable tray systems and cable ladder system.

show abstract

Electric Modulus Spectroscopic Studies of the Dielectric Properties of Carbon Nanotubes/Epoxy Polymer Composite Materials

Cited by 23 publications

References 19 publications

Study Analysis of Thermal, Dielectric, and Functional Characteristics of an Ethylene Polyethylene Diene Monomer Blended with End-of-Life Tire Microparticles Amounts

Study Analysis of Thermal, Dielectric, and Functional Characteristics of an Ethylene Polyethylene Diene Monomer Blended with End-of-Life Tire Microparticles Amounts

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Contact Info

Product

Resources

About

Electric Modulus Spectroscopic Studies of the Dielectric Properties of Carbon Nanotubes/Epoxy Polymer Composite Materials

Cited by 23 publications

References 19 publications

Study Analysis of Thermal, Dielectric, and Functional Characteristics of an Ethylene Polyethylene Diene Monomer Blended with End-of-Life Tire Microparticles Amounts

Study Analysis of Thermal, Dielectric, and Functional Characteristics of an Ethylene Polyethylene Diene Monomer Blended with End-of-Life Tire Microparticles Amounts

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs3Bi2Cl9 Perovskite Single Crystals

Study and Characterization of the Dielectric Behavior of Low Linear Density Polyethylene Composites Mixed with Ground Tire Rubber Particles

Contact Info

Product

Resources

About

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals