Thermal and Electrical Conductivity of Unsaturated Polyester Resin Filled with Copper Filler Composites

Yaman, Kemal; Taga, Özer

doi:10.1155/2018/8190190

Cited by 33 publications

(20 citation statements)

References 30 publications

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“…For volumetric fractions between 0 and 0.27 no appreciable changes were observed on the electrical conductivity. The average value for the electrical conductivity in this region was 8.2×10 −11 Sm −1 , which is a typical value for polyester resin [35]. On the other hand, the electrical conductivity has a rapid increase for volumetric fractions above 0.27, reaching a value of 8 ×10 −5 Sm −1 for a 0.5 vf, corresponding to an increase of 6 orders of magnitude respect to the matrix.…”

Section: Electrical Conductivitymentioning

confidence: 73%

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

et al. 2021

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Composites made up of microparticles embedded in a polymeric matrix have attracted increasing attention due to the possibility of tailoring their physical properties by adding the adequate quantity of fillers. As the concentration of these fillers increases, their connectivity changes drastically at a given threshold and therefore the electrical, thermal and optical properties of these composites are expected to exhibit a percolation effect. In this work, the thermal and electrical conductivities along with the emissivity of composites composed of carbonyl-iron microparticles randomly distributed in a polyester resin matrix are measured, for volume fractions ranging from 0 to 0.55. It is shown that both the thermal and electrical conductivities increase with the particles' concentration, such that their percolation threshold appears at volume fractions of 0.46 and 0.38, respectively. The emissivity, on the other hand, decreases as the fillers' concentration increases, such that it exhibits a substantial decay at a volume fraction of 0.41. The percolation threshold of the emissivity is thus higher than that of the thermal conductivity, but lower than the electrical conductivity one. This dispersion on the percolation concentration is justified by the different physical mechanisms required to activate the electrical, thermal, and optical responses of the considered composites. The obtained results thus show that the percolation phenomenon can efficiently be used to enhance or reduce the physical properties of particulate composites.

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Section: Electrical Conductivitymentioning

confidence: 73%

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

et al. 2021

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“…Increasing the loading of µCu could increase not only the contact between large particles but also collisions between them, turning them into tiny particles. Due to the filler particle size effect, [80] the large particles will form high-conducting pathways while the smaller particles will form low-conducting pathways. Therefore, the charge transport mechanisms of our material are based on both percolation and tunneling, as illustrated in Figure 5b.…”

Section: Electrical Properties Of Self-healing Electroconductive Compmentioning

confidence: 99%

Intrinsically Stretchable and Self‐Healing Electroconductive Composites Based on Supramolecular Organic Polymer Embedded with Copper Microparticles

Yeasmin

Duy

Han

et al. 2020

Adv Elect Materials

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Integration of electrical conductivity, stretchability, and self‐healing properties of electronic material is a promising way to meet the criteria for developing next‐generation technologies ranging from ordinary sustainable electronics to high‐tech human–machine interfaces. To this particular purpose, a cost‐effective composite material having simultaneous functionalities of electrical conductivity, stretchability, and self‐healability based on supramolecular organic polymer and copper microparticles is presented. The composite can be mass‐produced via the sol–gel method and is tunable by adjusting the copper loading. Electrical and mechanical characterizations show that the composite material owns not only a high stretchability (≥120%) but also an excellent self‐healability at ambient conditions within 5 min. The healing efficiency is about 90% for its mechanical property and almost 100% for its electrical properties. Besides, the electrical properties are found in the range of semiconductors that can be restored upon five cutting–healing cycles. One‐step further, the developed material is utilized to fabricate a wearable strain sensor. Also, real‐time human motion detection is demonstrated using the fabricated sensor. These results exhibit the potential of the material for developing self‐healing electronic devices and show promising directions in the field of wearable and sustainable electronics, human–machine interfaces.

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“…Calculated values of thermal effusivity and diffusivity are shown in Fig. 5 for both C/P [34] and C/G/P composites. The effusivity values of C/P composites are higher than that of C/G/P composites.…”

Section: Thermal Conductivity λmentioning

confidence: 99%

“…This threshold concentration is called percolation. It is reported in the literature that the value of percolation concentration depends primarily on the concentration, shape and size of the filler used [22,27,34,37,38,40]. Besides, the regular spatial distribution of conductive particles in the matrix, the amount of filler that should be added is of sufficient quantity and the physical properties of the polymer used are basic parameters that are effective on the percolation value.…”

Section: Electrical Conductivity σmentioning

confidence: 99%

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Size, Concentration and Content Effect of Copper/Graphite Hybrid Dopant on Mechanical, Thermal and Electrical Conductivity Characteristics of Unsaturated Polyester Resin

Yaman

Öktem

2020

Acta Phys. Pol. A

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In this paper, mechanical, thermal, electrical, and physical properties of unsaturated polyester resin with dendritic-shaped copper(Cu)-graphite (Gr) fillers were experimentally investigated and correlations were proposed with several theoretical models. On the other hand, the Gr filler is added as a secondary filler to provide synergy and obtain better conductivities. For this purpose, 5 wt% Gr filler was added as a secondary filler while Cu was added with changing weight rates. In each experiment, the basic aim is to determine the effects of both filler size and concentration on the mechanical, thermal, and electrical characterizations of the composite mixture. It is observed that an increase in filler concentration causes an increase in thermal conductivities. On the contrary, the coefficient of thermal expansion and specific heat decrease with increasing filler content. The hybrid filler allows the positive synergistic effect on mechanical performance but restricts conductivity properties. The particle size also causes a minimal linear increase in thermal conductivity. Thermal analysis such as thermogravimetric analysis and differential scanning calorimetry show that the thermal stability increases with the filler concentration. On the other hand, the electrical conductivity increases with increasing filler particle size and concentration. Using this high conductive novel composite mixture as an electrode hard steel parts were engraved in an electric discharge machine. Regarding the experimental-theoretical correlation, the best agreement is achieved with the Maxwell model.

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Thermal and Electrical Conductivity of Unsaturated Polyester Resin Filled with Copper Filler Composites

Cited by 33 publications

References 30 publications

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

Intrinsically Stretchable and Self‐Healing Electroconductive Composites Based on Supramolecular Organic Polymer Embedded with Copper Microparticles

Size, Concentration and Content Effect of Copper/Graphite Hybrid Dopant on Mechanical, Thermal and Electrical Conductivity Characteristics of Unsaturated Polyester Resin

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