Studies of dielectric relaxation in natural fiber–polymer composites

Amor, Ikram Ben; Rekik, H.; Kaddami, Hamid; Raihane, Mustapha; Arous, M.; Kallel, A.

doi:10.1016/j.elstat.2009.06.004

Cited by 62 publications

(24 citation statements)

References 21 publications

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“…E a and s 0 were extracted from the slopes and the intercepts of the plots of log s versus 1/T. 62 The Argand representation was used to analyze the nature of the relaxation. However, it can be noted that the incorporation of fibers decreased the apparent activation energy (E a a ) for the two composites in comparison with that for the matrix determined in the previous study; this could be ascribed to the interaction between the fibers and the matrix.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…16,17 Indeed, it has been shown that the pretreatment of the natural fibers with chemical methods (e.g., the use of coupling agents, e.g., silane compounds) enhances the adhesion at the fiber-matrix interface and reduces the moisture sorption of these fibers. 12,13,19,20 In this study, nonwoven alfa, wool, and thermobinder fibers [poly(ester terephthalate) (PET)-polyethylene (PE)]-reinforced UP resin composite [natural-fiber-reinforced unsaturated polyester (NFRUP)] were prepared, and their dielectric properties were compared with conventionally reinforced E-glass-mat-reinforced unsaturated polyester (EGMRUP). In addition, the amount of moisture sorption can be reduced significantly through the replacement of natural fibers with a small amount of synthetic fibers, such as glass or carbon.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of the dielectric properties of natural‐fiber–matrix composites and E‐glass–matrix composites

Triki

Guicha²,

Hassen³

et al. 2012

J of Applied Polymer Sci

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In this work, we undertook a comparative study of the dynamic dielectric analysis of two composites: natural-fiber-reinforced unsaturated polyester (NFRUP) and E-glass-mat-reinforced unsaturated polyester (EGMRUP). In both composites, two common relaxation processes were identified, the first of which was the a-mode relaxation associated with the glass transition of the matrix. The second one was associated with conductivity that occurred because of the carriers' charge diffusion and was observed at temperatures above the glass transition and at low frequencies. However, the interfacial or Maxwell-Wagner-Sillars polarization was noticed only in the NFRUP composite. This dielectric study also revealed that compared to E-glass fibers, natural fibers enhanced the thermal insulation in the composite. Also, the study of the fiber adhesion in the matrix with scanning electron microscopy, differential scanning calorimetry, and tensile testing revealed a great compatibility of the fibers with the matrix in both composites.

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Section: Dielectric Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative study of the dielectric properties of natural‐fiber–matrix composites and E‐glass–matrix composites

Triki

Guicha²,

Hassen³

et al. 2012

J of Applied Polymer Sci

Self Cite

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“…But with increasing frequency, dielectric constant and dissipation factor decrease. [21] Amora et al studied [22] polymer composites of a polyester resin matrix filled with short palm fibres by means of dielectric spectroscopy in the frequency range 0, 1-100 kHz and temperature interval from 40 to 200 °C.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotubes implantation on electrical properties of sisal fibre–epoxy composites

Dwivedi

Trihotri

Gupta

et al. 2016

Composite Interfaces

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In this paper, the effects of carbon nanotubes (CNT) implantation and sisal fibre size on the electrical properties of sisal fibre-reinforced epoxy composites are reported. For this purpose, the epoxy composites reinforced with CNT-implanted sisal fibre of 5 mm and 10 mm lengths were prepared by hand moulding and samples characterized for their electrical properties, such as dielectric constant (ε′), dielectric dissipation factor (tan δ) and AC conductivity (σ ac ) at different temperatures and frequencies. It was observed that the dielectric constant increases with increase in temperature and decreases with increase in frequency from 500 Hz to 5 KHz. Interestingly, the sample having CNT-implanted sisal fibre of 5 mm length exhibited the highest value of dielectric constant than the one with length 10 mm. This is attributed to the increased surface area of sisal fibre and enhancement of the interfacial polarization. At a constant volume and a length of 5 mm of the fibres, the number of interfaces per unit volume element is high and results in a higher interfacial polarization. The interfaces decrease as the fibre length increases, and therefore, the value of ε′ decreases at 10 mm fibre length. The peak value of the dielectric constant decreases with increasing frequency. A continuous decrease in dissipation factor (tan δ) with increasing frequency for all samples was observed, while at lower temperatures, the values of tan δ remains approximately same. The AC conductivity for 5 mm length sisal epoxy composite and 10 mm length sisal fibre-epoxy composites is higher than that of pure epoxy at all the frequencies.

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“…What is more, most nonwood fibers are bulky and vulnerable to biological deterioration during storage. Wood fibers, such as teak wood flour [22] , rubber wood sawdust [23] , palm tree fiber [24] , and sugar palm fiber [25] have been investigated as the filler for WPCs in the past years. However, the matrix materials in the above-mentioned literatures are nondegradable polymers, such as PE, PP, and PVC, et al The resulting WPCs cannot completely degrade after abandoning, which will cause serious secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Polylactide-Based Wood Plastic Composites Toughened with SBS

Qiang

Gao

et al. 2012

Polymer-Plastics Technology and Engineering

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Wood plastic composites (WPCs) composed of polylactide (PLA), pine wood flour (WF), and SBS were successfully manufactured through extrusion blending followed by injection molding. The impact strength and elongation at the break of the PLA-based WPCs toughened with SBS were higher than their non-toughened counterparts, in contrast to the decrease in the tensile strength.There was a percolation process in brittle-ductile transition of the impact strength for the SBS-toughened WPCs when the WF content was between 15 and 35 wt%. TGA indicated that SBS had no significant effect on the thermal stability of the resulting hybrid composites.

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Studies of dielectric relaxation in natural fiber–polymer composites

Cited by 62 publications

References 21 publications

Comparative study of the dielectric properties of natural‐fiber–matrix composites and E‐glass–matrix composites

Comparative study of the dielectric properties of natural‐fiber–matrix composites and E‐glass–matrix composites

Effect of carbon nanotubes implantation on electrical properties of sisal fibre–epoxy composites

Polylactide-Based Wood Plastic Composites Toughened with SBS

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