Investigation on electromagnetic characteristics, microwave absorption, thermal and mechanical properties of ferromagnetic cobalt–polystyrene composites in the X-band (8.4–12.4 GHz)

Ansari, A. A.; Akhtar, M. Jaleel

doi:10.1039/c5ra26489h

Cited by 41 publications

(13 citation statements)

References 58 publications

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“…The dynamic DTA curves of the decomposition of UPR and composites with different copper filler concentrations are plotted in Figure 6. The maximum weight loss occurs at the temperature interval of 400-440 ∘ C. This analysis reveals that the thermal stability of composites increases with increasing of the copper content [20].…”

mentioning

confidence: 78%

“…The stress-strain curves representing the neat UPR and its composites in various filler loadings are shown in Figure 8. The mechanical properties of the compound mixture have been found to be significantly increased compared to pure UPR [14,17,[19][20][21]. The slope of the curves increases with increasing Cu content.…”

Section: Mechanicalmentioning

confidence: 97%

“…As a consequence, studies in the literature show that both thermal and electrical conductivity increase with increasing filler content and size [1][2][3][4][5][6][7][8][9][10][11][12][13][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. It is also understood that the filling material particle shape is another important factor [30,31].…”

Section: Electrical Conductivitymentioning

confidence: 99%

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

Yaman

Taga

2018

International Journal of Polymer Science

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Thermal and electrical conductivity of unsaturated polyester resin with copper filler composite material are investigated both theoretically and experimentally. In the experiments, polyester matrix is combined with dendrite-shape copper to determine the effects of both filler size and content on thermal and electrical conductivity, respectively. It is observed that the increase in the concentration causes the thermal and electrical conductivity of composite mixture to grow up. It has also been observed that the both thermal and electrical conductivity increase with increasing filler particle size.

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mentioning

confidence: 78%

Section: Mechanicalmentioning

confidence: 97%

Section: Electrical Conductivitymentioning

confidence: 99%

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

Yaman

Taga

2018

International Journal of Polymer Science

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“…The change in decomposition is clearly observed. The maximum weight loss occurs at the temperature interval of ∼ 300-400 • C. The DSC shows that the thermal stability is increased by the filler concentration [25][26][27][28]. It can also be said that the degradation in the composite structure is proportional to the thermal resistance.…”

Section: Resultsmentioning

confidence: 99%

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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“…1) The surface of magnetic metals is coated with inorganic or polymer materials to form core–shell structures such as Fe/SiO 2 and Fe 3 O 4 /polydopamine . 2) Magnetic metals are dispersed in polymer matrix such as Co/polystyrene and NiZnFe 2 O 4 /polyaniline (PANI) . 3) Magnetic metals are coated with carbon materials (i.e., graphene, carbon nanofiber, and carbon nanotube) such as Fe 3 O 4 /carbon core–shell nanotubes, spheres or rings, and graphene@Ni@carbon because of their high specific surface area, light weight, low density, and good conductivity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Magnetic Cobalt and Electrically Conductive Polyaniline‐Filled Three‐Phase Nanocomposite for Microwave Absorption

Yao

Xia

Qiu

et al. 2019

Physica Status Solidi (a)

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Magnetic cobalt (Co) and electrically conductive polyaniline (PANI)-filled polyurethane (PU) composite (Co@PANI@PU) film is proposed for microwave absorption. This three-phase Co@PANI@PU composite is fabricated through mechanical ball milling of Co microspheres and PANI particles, followed by their casting forming with PU. Prior to that, Co microspheres and conductive PANI are synthesized by ultrasonic-assisted solution reduction and simple oxidation polymerization, respectively. Field-emission scanning electron microscopy and X-ray diffraction characterizations indicate that the Co microparticles have sufficient incorporation into PANI and PU matrices. Electrical conductivity measurement shows that the PANI composition improved the conductivity of Co@PANI@PU film, whereas the Co composition suppressed it. The microwave absorption property of these Co@PANI@PU composite films under low filling contents of Co and PANI, and with small thickness (1 mm), is investigated in the 0.1-18 GHz range. The results indicate that the reflection loss increased with increasing Co and PANI compositions. 16:8:100 w/w/w Co@PANI@PU shows the highest absorption within 0.1-8.8 GHz, whereas 16:16:100 Co@PANI@PU absorbed most at 10.2-18 GHz. This is attributed to different contributions of permittivity and permeability of the Co and PANI compositions to energy loss in the two frequency bands. Therefore, appropriate ratio and content of the Co and PANI compositions play significant roles for frequency-adjustable microwave absorption.

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Investigation on electromagnetic characteristics, microwave absorption, thermal and mechanical properties of ferromagnetic cobalt–polystyrene composites in the X-band (8.4–12.4 GHz)

Abstract: The electromagnetic, thermal and mechanical properties of ferromagnetic cobalt–polystyrene composites in the X-band (8.4–12.4 GHz) are investigated in order to explore their usage for wide band microwave absorbers.

Cited by 41 publications

References 58 publications

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

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

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

Fabrication of Magnetic Cobalt and Electrically Conductive Polyaniline‐Filled Three‐Phase Nanocomposite for Microwave Absorption

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