Dielectric relaxation behaviour of ethylene-vinyl acetate–exfoliated graphene nanoplatelets (xGnP) composites

Dash, Bikash Kumar; Achary, P. Ganga Raju; Nc, Nayak

doi:10.1007/s10854-015-3351-2

Cited by 11 publications

(5 citation statements)

References 40 publications

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“…The EVA/reduced graphene oxide composites prepared by in situ polymerization showed an electrical conductivity of 2.7 ×10 -3 S/cm upon the addition of 6 wt % of the filler [43]. The electric percolation threshold of EVA composite prepared by solvent-casting was reported at a loading or 17 per hundred [44].…”

Section: Introductionmentioning

confidence: 97%

Electrical, thermal and rheological properties of low-density polyethylene/ethylene vinyl acetate/graphene-like composite

Azizi

Ouellet-Plamondon

Nguyen‐Tri

et al. 2019

Composites Part B: Engineering

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Composites of low-density polyethylene (LDPE), ethylene vinyl acetate (EVA), and a graphene-like material were explored for their electrical properties for use in high-volume lowcost conductive applications. A graphene-like material, obtained from hybrid clay-sucrose carbonization, was investigated as an alternative filler with advantages over conventional graphene technology. The electrical properties of the composites as synthesized by the solvent-casting technique were studied using broadband dielectric spectroscopy. The percolation threshold was identified for both as synthesized and annealed composite samples. Due to charge transport and electrode polarization, the sub-percolating composites exhibited low frequency dispersion particularly at elevated temperatures. Composites of LDPE/EVA/graphene-like above the percolation threshold exhibited a higher rheological storage modulus and thermal stability which indicates an alignment between the electrical, thermal and rheological properties.

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Section: Introductionmentioning

confidence: 97%

Electrical, thermal and rheological properties of low-density polyethylene/ethylene vinyl acetate/graphene-like composite

Azizi

Ouellet-Plamondon

Nguyen‐Tri

et al. 2019

Composites Part B: Engineering

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“…[ 46 ] However, as the frequency increases, the electric field changes rapidly and the period is very short, which makes the dipole's steering movement unable to keep up with the change of the electric field due to internal resistance. [ 68 ] At the same time, due to the increase in thickness, PANI forms a conductive path. When the thickness increases more than 75 µm, a leakage current phenomenon occurs due to the formation of a conductive path.…”

Section: Resultsmentioning

confidence: 99%

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

et al. 2021

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Confined polymerization is an effective method for precise synthesis, which can further control the micro-nano structure inside the composite material. Polyaniline (PANI)-based composites are usually prepared by blending and original growth methods. However, due to the strong rigidity and hydrogen bonding of PANI, the content of PANI composites is low and easy to agglomerate. Here, based on confined polymerization, it is reported that polyaniline /polyether ether ketone (PANI/PEEK) film with high PANI content is synthesized in situ by a one-step method. The micro-nano structure of the two polymers in the confined space is further explored and it is found that PANI grows in the free volume of the PEEK chain, making the arrangement of the PEEK chain more orderly. Under the best experimental conditions, the prepared 16 μm-PANI/PEEK film has a dielectric constant of 205.4 (dielectric loss 0.401), the 75 μm-PANI/PEEK film has a conductivity of 3.01×10 −4 S m −1 . The prepared PANI/PEEK composite film can be further used as electronic packaging materials, conductive materials, and other fields, which has potential application prospects in anti-static, electromagnetic shielding materials, corrosion resistance, and other fields.

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“…(2) When the frequency increases, the reversion of dipoles is unable to keep up with the change of electrical fields on account of resistance in the materials, which consequently forms relaxation. 47 (3) While the frequency reaches very high, some dipoles cease reversing that results in making no contribution to the permittivity. Observing Figure 6a,b, it is easily found that the permittivity of 2.83 vol % HBSiPA−TrGO/AR at 10 2 or 10 3 Hz is as high as 355 and 325, approximately 3.5 and 2.8 times that of 1.69 vol % TrGO/AR, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…As a comparison, the dielectric constant decreases in pace with frequency increasing with the addition of fillers, which is ascribed to the following explanations: (1) The dielectric constant of materials is caused by polarization; the polarization is originated from the directional alignment of some dipoles, which is capable of reversing the applied field with the electrical field due to the change of frequency. (2) When the frequency increases, the reversion of dipoles is unable to keep up with the change of electrical fields on account of resistance in the materials, which consequently forms relaxation . (3) While the frequency reaches very high, some dipoles cease reversing that results in making no contribution to the permittivity.…”

Section: Results and Discussionmentioning

confidence: 99%

Building a Novel Chemically Modified Polyaniline/Thermally Reduced Graphene Oxide Hybrid through π–π Interaction for Fabricating Acrylic Resin Elastomer-Based Composites with Enhanced Dielectric Property

Wang

Shao

et al. 2017

ACS Appl. Mater. Interfaces

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Sustainability urgently demands low dielectric loss and low elastic modulus as fostering high permittivity (Hi-K) conductor/polymer composites. This work introduces a ternary composite system, consisting of acrylic resin elastomer (AR), chemically modified polyaniline (HBSiPA), and the thermally reduced graphene oxides (TrGOs), for applying to actuators, of which AR was fabricated by free radical polymerization. The unique hybridized graphene (HBSiPA-TrGO) was prepared by a two-step procedure, including the doped polyaniline modified by the hyperbranched polysiloxane via a ring opening reaction, followed by the decoration of HBSiPA on the surface of TrGO, the conductivity of which is desired to be the same as that of graphene. Afterward, diverse filler contents of HBSiPA-TrGO were put into the AR matrix to fabricate composites with the solution casting method and TrGO/AR composites were fabricated as well for comparison. Unlike TrGO, HBSiPA has plenty of polyaniline chain segments that ensure better dispersion of graphene hybrids in the AR, and thus the composites inherit the excellent electrical property of graphene. The permittivity and dielectric loss of the HBSiPA-TrGO/AR composite at 100 Hz are 3.5 and 0.27 times that of the TrGO/AR composite, respectively, when the loading of fillers approaches the percolation threshold (f), which originates from the HBSiPA anchored onto the graphene serving as spacer and thus decreases the leakage currents induced by the contact of graphene sheets. Besides, the elastic modulus of 2.83 vol % HBSiPA-TrGO/AR composite was lower than 5 MPa.

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Dielectric relaxation behaviour of ethylene-vinyl acetate–exfoliated graphene nanoplatelets (xGnP) composites

Cited by 11 publications

References 40 publications

Electrical, thermal and rheological properties of low-density polyethylene/ethylene vinyl acetate/graphene-like composite

Electrical, thermal and rheological properties of low-density polyethylene/ethylene vinyl acetate/graphene-like composite

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

Building a Novel Chemically Modified Polyaniline/Thermally Reduced Graphene Oxide Hybrid through π–π Interaction for Fabricating Acrylic Resin Elastomer-Based Composites with Enhanced Dielectric Property

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