Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

Ahmed, Rania M.; El-Bary, A. Abd

doi:10.21608/ajnsa.2018.2715.1046

Cited by 4 publications

(8 citation statements)

References 24 publications

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“…The TSDC spectrum has a single sharp peak and high intensity at potential 400 V around 335 K (α relaxation) and a shoulder at 344 K, with three peaks appearing around 304, 309, and 324 K at 550 V. Meanwhile at 650 V, the spectra exhibit clear negative peaks at around 315 and 331 K. These peaks are denoted as β′, β, and α relaxations. The peak (α relaxation), which appears near T g in the range 323–335 K, depends on E p (these results are consistent with that previously reported in the DSC literature 18 ) that is ascribed to the space charge trapping mechanism. However, the α transition requires a linear relationship between the peak current ( I m ) and poling field E p .…”

Section: Resultssupporting

confidence: 91%

“…The choice of this concentration of high abrasion furnace (HAF) black loaded with PPy matrix increase the resultant DC electrical conductivity as mentioned in the previous work. 18 The resultant mixtures were sheeted on a two roll mill at ambient temperature. The sheets were then compression molded between smooth Teflon sheets at 110 C and 5 MPa in an electrically heated press (type carver M-154).…”

Section: Samples Preparationmentioning

confidence: 99%

“…[15][16][17] There has been previous study on this three-phase composite (EVA/PPy/CB). 18,19 In this paper, we consider composite containing EVA with different concentrations of PPy loaded with 20% high abrasion furnace (HAF) carbon black, and utilizing TSDC technique as an external stimulus, we try to investigate charge storage phenomena and the effect of stress fields on EVA-PPy composite.…”

Section: Introductionmentioning

confidence: 99%

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Thermally stimulated depolarization current characteristic of EVA–conductive PPy composites

Thabet

Abdelbary

Nasr

2019

Journal of Composite Materials

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Thermally stimulated depolarization current in pure poly(ethylene-co-vinyl acetate) and poly(ethylene-co-vinyl acetate) composites with different amounts of polypyrrole/carbon nanoparticles (of various weight ratios, 100:0, 95:5, 90:10, 85:15, 80:20, and 70:30) have been investigated at poling temperature 363 K using different polarizing voltage. Thermograms of pure and composite samples have two or three peaks over all temperature ranges depending on the polarizing voltage. The decrease in peak height with increased polarized voltage is observed in pure poly(ethylene-co-vinyl acetate) samples loaded with 5%, 10%, 15%, and 30% polypyrrole due to the detrapping of the large amounts of charge results in electrode blocking and decrease in thermally stimulated depolarization current in those samples. The molecular parameters, such as activation energy E, charge released Q, and relaxation times τ0 and τ m for thermally stimulated depolarization current peaks have been estimated.

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Section: Resultssupporting

confidence: 91%

Section: Samples Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermally stimulated depolarization current characteristic of EVA–conductive PPy composites

Thabet

Abdelbary

Nasr

2019

Journal of Composite Materials

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“…This would be reflected in the transition point shift and the elastic modulus values. Dynamic T t values were significantly different for all the samples, as previously observed for static T t [27]. For pure EVA, dynamic T t was approximately 67.3°C, which was significantly larger than the static T t (54°C) [27], because of differences in DSC and DMA measurement techniques.…”

Section: Damping Parameter Tan δ and Transition Temperature T Tsupporting

confidence: 64%

Dynamic mechanical analysis and non-isothermal kinetics of EVA/PPy carbon black nanocomposites

Naim

Elbary

Ibrahim

2019

Materials Science and Technology

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Pure ethylene-co-vinyl acetate (EVA) and its conductive blend-nanocomposite with polypyrrole (PPy)/carbon black (CB) were prepared using a melt mixing process. Dynamic mechanical analysis and non-isothermal thermal gravimetrical analysis were performed on the samples. The storage modulus, loss modulus, and damping factor of the EVA/PPy/CB nanocomposites were significantly affected by the incorporation of PPy/CB. Two thermal decomposition stages were detected for pure and blended nanocomposite samples. Peak analysis was used to deconvolve the first complex decomposition stage. The Coats-Redfern method was used to determine the kinetic parameters. Improving the thermal and mechanical properties of the EVA co-polymer will enable the three-phase blend/nanocomposites to be used in several industrial applications.

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“…It was observed that the additions of conductive materials to these polymers not only increases the electrical conductivity but also improves its mechanical properties. 7-12…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-axial tensile tension, temperature, and hysteresis loss of natural rubber doped MWCNTs on the electrical properties for sensors applications

Aljuraide

Tammam

Elbary

2022

Journal of Elastomers & Plastics

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In view of its large application, one used natural rubber (NR). The effects of MWCNTs contents on electrical properties as well as the effect of both pre extension and mechanical hysteresis on the electrical properties of these composites were discussed. At low MWCNTs contents (≤6 phr), έ, σac, and σdc showed to have slight changes. Meanwhile, contents (≥9 phr) have significant increase as a result of its interfacial polarization. That is, the composite became conductive. Higher positive electrical conductivity coefficient (PTCC) intensity was detected for the 3phr sample. The effect of the electric field on the mechanical creep characteristics and its corresponding parameters were investigated. Conventional elastic modulus was found to increase with both MWCNTs concentration and the applied stress in all samples about six times its original value. Current creep curves were constructed and maximum piezoresistivity was found for sample 3phr with a negative effect on piezoresistivity, which can be employed as a pressure or force sensor. The parameters deduced from hysteresis loop such as the strain coefficient of conductivity, damage parameter, strain energy density, inelastic strain, elastic strain, and mismatch parameter are strongly dependent on both the MWCNTs concentration and the applied mechanical stress. The damage parameter increased to about 20 times with increasing the concentration, while the decreases with increasing number of hysteresis cycles. The activation energy decreased with the pre-axial tension, while no effect of electrical conductivity.

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Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

Cited by 4 publications

References 24 publications

Thermally stimulated depolarization current characteristic of EVA–conductive PPy composites

Thermally stimulated depolarization current characteristic of EVA–conductive PPy composites

Dynamic mechanical analysis and non-isothermal kinetics of EVA/PPy carbon black nanocomposites

Effect of pre-axial tensile tension, temperature, and hysteresis loss of natural rubber doped MWCNTs on the electrical properties for sensors applications

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