The influence of frequency and temperature upon dielectric behavior of polypropylene reinforced with multi-walled carbon nanotubes (MWCNTs)

Olariu, Marius; Scarlatache, Vlad-Andrei; Niagu, Andrei; Ursache, Silviu; Ciobanu, Romeo Cristian

doi:10.1109/optim.2012.6231902

Cited by 4 publications

(11 citation statements)

References 5 publications

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“…The evolution of the dielectric losses in 2D and 3D representation is shown in Fig. 3, as Tan (Delta), where a peak is observed clearly around the frequency of a few MHz, a phenomenon that is due to the dipolar polarization or polarization of orientation, which was observed more clearly in the material analysis at low frequency [9]. This peak becomes more noticeable with increasing the temperature and disappears with increasing of frequency.…”

Section: Broadband Dielectric Spectroscopy Resultsmentioning

confidence: 86%

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Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Ursache

Ciobanu

Scarlatache

et al. 2013

AEF

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Abstract. The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNT's.

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Section: Broadband Dielectric Spectroscopy Resultsmentioning

confidence: 86%

“…1. The measurement system of the dielectric characteristics at high frequency The dielectric properties of the samples were analyzed on the basis of the complex permittivity, ε*(ω) [8,9].…”

Section: Dielectric Analysis Investigation Methodsmentioning

confidence: 99%

Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Ursache

Ciobanu

Scarlatache

et al. 2013

AEF

Self Cite

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“…The electrical properties of CNT/polymer nanocomposites depend on several factors, including the CNT content [1,[3][4][5], properties of the polymeric matrix [1,4,6,7], dispersion state, and the processing method [8,9], among others. Temperature is another physical variable that may greatly affect the electrical conductivity of carbon nanostructured polymer nanocomposites [4,5,[10][11][12][13]. The coupling phenomenon between the direct current (DC) electrical resistance (R) of the material and its temperature (T) is known as thermoresistivity.…”

Section: Introductionmentioning

confidence: 99%

“…The coupling phenomenon between the direct current (DC) electrical resistance (R) of the material and its temperature (T) is known as thermoresistivity. If the tests are conducted under alternating current (AC), the phenomenon is termed thermoimpedance [12][13][14][15]. In metallic materials, thermoresistivity has a positive linear response, that is, R increases linearly with increasing T. In semiconductors, R decreases nonlinearly with T [16].…”

Section: Introductionmentioning

confidence: 99%

“…However, the thermal expansion of the matrix is considered the main governing thermoresistive mechanism for polymeric nanocomposites with relatively low filler content (<3%) [3,4,10,17]. On other hand, thermoimpedance has been much less studied than thermoresistivity [12][13][14]. In this regard, the broadband dielectric (or impedance) spectroscopy (BDS) technique covers a wide frequency spectrum and a broad temperature range of the dynamic electrical response (AC) of a material [20].…”

Section: Introductionmentioning

confidence: 99%

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Effect of temperature on the electrical and electromechanical properties of carbon nanotube/polypropylene composites

Balam,

Valdez-Nava,

Bley

et al. 2023

Smart Mater. Struct.

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The effect of temperature on the electrical and electromechanical (piezoresistive) properties of composite films made of multiwall carbon nanotubes (MWCNTs) and polypropylene is investigated. The electrical response to temperature in alternating current (AC, i.e., thermoimpedance) showed higher sensitivity than in direct current (DC, thermoresistivity) and is influenced by frequency (f). The sensitivity factor in DC reached 1.07 %ºC-1, while in AC at 100 Hz was 2.7 %C-1 for the impedance modulus for nanocomposites with 4 wt. % of MWCNTs. The electrical properties of the nanocomposites in AC investigated through broadband dielectric spectroscopy exhibited a resistive-capacitive behavior with a transition at f ~104 Hz. Temperature also showed a strong influence on the piezoresistive response of the nanocomposites, showing a 10 % increase in the piezoresistive sensitivity at 50 °C with respect to the response at 25 °C, and an important decrease in sensitivity at 100 °C for small (< 3 %) strains. The influence of temperature on the electrical and electromechanical responses investigated herein may assist in further developments of smart temperature-sensing materials, and in developing thermal compensation factors to properly calibrate piezoresistive/piezoimpedance responses for strain measurements.

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High-temperature-resistant barium strontium titanate @Ag/poly(arylene ether nitrile) composites with enhanced dielectric performance and high mechanical strength

Tang

Xia

Yin

et al. 2021

Adv Compos Hybrid Mater

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The influence of frequency and temperature upon dielectric behavior of polypropylene reinforced with multi-walled carbon nanotubes (MWCNTs)

Cited by 4 publications

References 5 publications

Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Effect of temperature on the electrical and electromechanical properties of carbon nanotube/polypropylene composites

High-temperature-resistant barium strontium titanate @Ag/poly(arylene ether nitrile) composites with enhanced dielectric performance and high mechanical strength

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