Electrical and thermal phenomena in low‐density polyethylene/carbon black composites near the percolation threshold

Azizi, Sohrab; David, Éric; Fréchette, M.F.; Nguyen-Tri, Phuong; Ouellet-Plamondon, Claudiane

doi:10.1002/app.47043

Cited by 35 publications

(31 citation statements)

References 60 publications

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“…This research is a continuous works focused on polymers and multifunctional composites [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86]. The main findings of this work were as follows:…”

Section: Discussionmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

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105

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This work emphasizes the use of the silver decorative method to enhance the antibacterial activity of TiO2 and ZnO nanoparticles. These silver-decorated nanoparticles (hybrid nanoparticles) were synthesized using sodium borohydride as a reducing agent, with the weight ratio of Ag precursors/oxide nanoparticles = 1:30. The morphology and optical properties of these hybrid nanoparticles were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) patterns, and UV-Vis spectroscopy. The agar-well diffusion method was used to evaluate their antibacterial activity against both Staphylococcus aureus and Escherichia coli bacteria, with or without light irradiation. The TEM images indicated clearly that silver nanoparticles (AgNPs, 5–10 nm) were well deposited on the surface of nano-TiO2 particles (30–60 nm). In addition to this, bigger AgNPs (<20 nm) were dispersed on the surface of nano-ZnO particles (30–50 nm). XRD patterns confirmed the presence of AgNPs in both Ag-decorated TiO2 and Ag-decorated ZnO nanoparticles. UV-Vis spectra confirmed that the hybridization of Ag and oxide nanoparticles led to a shift in the absorption edge of oxide nanoparticles to the lower energy region (visible region). The antibacterial tests indicated that both oxide pure nanoparticles did not exhibit inhibitory effects against bacteria, with or without light irradiation. However, the presence of AgNPs in their hybrids, even at low content (<40 mg/mL), leads to a good antibacterial activity, and higher inhibition zones under light irradiation as compared to those in dark were observed.

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Section: Discussionmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

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105

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“…Electrically conductive and semi-conductive polymer composites are being more and more involved in a wide range of industrial applications including flexible electronics, soft robotics, health monitoring devices, anti-static materials, sensors, protective screens for power cables, electric field-grading materials for cable accessories and electromagnetic interference shielding materials [1][2][3][4][5][6][7][8][9][10]. Different conductive particles have been investigated as fillers for these composites such as metallic particles and carbon based particles including carbon fibers, carbon black, carbon nanotubes, reduced graphene oxide, exfoliated graphite and graphene [3][4][5][11][12][13][14][15][16]. In particular, graphene gained increasing interest recently, to be used as an effective filler in polymer composites to enhance their electrical, thermal and mechanical properties, due to its outstanding intrinsic properties, low density and very attractive geometry, i.e., high aspect ratio, high effective surface area and plate-like geometry [10,12,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Correlation between morphology, rheological behavior, and electrical behavior of conductive cocontinuous LLDPE/EVA blends containing commercial graphene nanoplatelets

Helal

Kurusu

Moghimian

et al. 2019

Journal of Rheology

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In this work, co-continuous blends of linear low density polyethylene (LLDPE)/ Ethyl vinyl acetate (EVA) containing graphene (GN) have been studied. Although mass-produced GN grade prepared by mechanochemical exfoliation of graphite and a facile melt compounding technique were adopted, it was possible to lower the electrical percolation threshold significantly by controlling the localization of GN nanoplatelets in the blend and by applying an appropriate thermal annealing procedure. The electrical and rheological properties of the obtained nanocomposites were systematically investigated to get an insight on the composite morphology. During annealing, an alignment between time-dependent behaviors of viscoelastic moduli and electrical conductivity was observed. An increase of both quantities and a simultaneous coarsening of the blend's morphologies occurred during the first 30 minutes of annealing followed by a more stable behavior. This rise was attributed to the diffusion and flocculation of GN nanoplatelets and their migration to the interface. Furthermore, the electrical and rheological percolation threshold concentrations were evaluated using a scaling Power law. The electrical percolation threshold was reduced to 0.5 vol% upon thermal annealing and was close to the rheological percolation threshold. Finally, the viscoelastic response of the composites was well described by a two-phase model, indicating that the effect of the relaxation dynamics of the interfacial network does not depend on the blend's morphology, even though the latter affects the space arrangement of GN and consequently the strength of the formed network.

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“…Several investigations have been reported on the effect of industrial contaminants on the morphology, mechanical properties and structure of glove material. In previous works [15][16][17][18][19][20][21][22][23][24], we reported that polymers and composites [16][17][18][19][20]22,23,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] can be degraded by several aging agents such as heat, water, humidity, oxygen, ozone and various other environments factors [16][17][18][19][20][21][22][23][24]. The scission, crosslinking and plasticization of polymer networks may occur and led to severe deterioration of the mechanical and physicochemical properties of the material [42], which are quite important with regard their applications in various fields of mechanical engineering.…”

Section: Introductionmentioning

confidence: 99%

Butyl Rubber-Based Composite: Thermal Degradation and Prediction of Service Lifetime

2019

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Butyl rubber-based composite (BRC) is one of the most popular materials for the fabrication of protective gloves against chemical and mechanical risks. However, in many workplaces, such as metal manufacturing or automotive mechanical services, its mechanical hazards usually appear together with metalworking fluids (MWFs). The presence of these contaminants, particularly at high temperatures, could modify its properties due to the scission, the plasticization and the crosslinking of the polymer network and thus lead to severe modification of the mechanical and physicochemical properties of material. This work aims to determine the effect of temperature and a metalworking fluid on the mechanical behavior of butyl rubber composite, dealing with crosslinking density, cohesion forces and the elastic constant of BRC, based on Mooney–Rivlin’s theory. The effect of temperature with and without MWFs on the thermo-dynamical properties and morphology of butyl membranes was also investigated. The prediction of service lifetime was then evaluated from the extrapolation of the Arrhenius plot at different temperatures.

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Electrical and thermal phenomena in low‐density polyethylene/carbon black composites near the percolation threshold

Cited by 35 publications

References 60 publications

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Correlation between morphology, rheological behavior, and electrical behavior of conductive cocontinuous LLDPE/EVA blends containing commercial graphene nanoplatelets

Butyl Rubber-Based Composite: Thermal Degradation and Prediction of Service Lifetime

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