The effect of gamma irradiation on the thermal behavior of dielectric properties of linear low-density/carbon black semiconductive composites

Dudić, Duško; Luyt, A. S.; Marinković, Filip; Petronijević, Ivan; Dojčilović, Jablan; Kostoski, D.

doi:10.1016/j.radphyschem.2014.10.003

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…This enhances the PTCR intensity of the composite, and eliminates the NTCR effect of the composites fully. Chen et al in 2012 36 along to the Meyer, Allak and others [37][38][39][40][41][42] proposed a model that introduce the crystalline and amorphous phases. T. Arfin et al in 2013 43 predicted that the relation between electrical conductivity of composites with temperature to be an Arrhenius relation.…”

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confidence: 99%

Investigation of the Electrical Properties of Polymer/Carbon Composites Exposed to Joule Heating and Heat Treatment

Taherian

Ghorbani

2017

ECS J. Solid State Sci. Technol.

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The bipolar plates are the essential part of Proton Exchange Membrane (PEM) fuel cells made of polymer-based-carbon composite or coated metallic materials. The composite type of bipolar plates has different microstructural and electrical properties that can considerably change under the operating conditions because of exposing to the high body temperature of the fuel cell and flowing the electric current from the parts named joule-heating effect. In this research, the different types of composites, containing phenolic resin as matrix and carbon fiber, graphite, and expanded graphite as filler, have been manufactured. The structural and electrical properties have been investigated by performing the heat-treatment (in three temperatures of 50, 100, and 150 • C) and joule-heating effect (in three induced powers 1.5, 5, and 10 W) tests. Here, the effect of time has been investigated too. Finally, SEM and optical microscopes, as well as DSC-TGA, electrical conductivity, and performance analyses are used for characterization. The results of electrical conductivity of different composites in the heat-treatment and joule heating effect tests showed that some of composite have a positive and some of them show negative temperature coefficient of resistivity. Bipolar plates are key components of Proton Exchange Membrane Fuel Cells (PEMFC). They are responsible for functions of vital importance to the long-term operation of these electrochemical devices. They play major roles in water and gas management, mechanical stability and electrical performance of fuel cells. 1-3Carbon-polymer (P) composites with either thermoplastic or thermoset matrices are advantageous over metallic materials with regard to corrosion resistance, low weight, and easy productablity.21 These carbon-polymer composites applied for bipolar plates usually contain the thermoset or thermoplastics as matrix and carbon fiber (CF), graphite (G), expanded graphite (EG), and carbon black (CB), carbon nanotube (CNT) as reinforcement.1-9 These fillers differ with together from the viewpoint of morphology and electrical conductivity. Therefore, it is anticipated that the electrical conductivity of their composites differs from each other. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The electrical conductivity of composite bipolar plates is the most important properties of in DOE. There are some parameters influencing on the electrical conductivity of composites, such as filler content, filler length, filler aspect ratio, filler size, filler orientation, filler surface energy, matrix surface energy, and so on Ref. 7. Moreover, the body temperature of the fuel cell and passing electricity of different layers of the fuel cell during the operation can change the microstructural and electrical properties of composite layers such as bipolar plates and gas diffusion layer (GDL). It has been established that the passage of electrical conductivity and the high body temperature can influence on electrical conductivity of the composites, 21-24 the...

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mentioning

confidence: 99%

Investigation of the Electrical Properties of Polymer/Carbon Composites Exposed to Joule Heating and Heat Treatment

Taherian

Ghorbani

2017

ECS J. Solid State Sci. Technol.

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“…The samples were cut to completely cover the surfaces of the electrodes. The details of the equipment were given elsewhere . The conductance ( G ) and susceptance ( B ) were measured in the parallel mode capacitance ( C p ) measurement model of the instrument.…”

Section: Methodsmentioning

confidence: 99%

Dielectric and optical properties of a poly(ethylene terephthalate) membrane in the temperature interval 150–400 K

Maletić

Cerović

Marinković

et al. 2015

J of Applied Polymer Sci

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In this study, the dielectric and optical properties of poly(ethylene terephthalate) (PET) membranes were examined. The dielectric measurements were carried out in the temperature interval 150-400 K and in the frequency range 20 Hz-60 kHz. We analyzed in detail the temperature dependences of the dielectric permittivity and dielectric loss (tan d) at various test frequencies. The relaxation tan d peak, which appeared in the temperature range 150-300 K, was identified as the secondary b relaxation. The increase in tan d at temperatures higher than 300 K could be explained as approaching the a relaxation. Optical measurements were performed in the UV-visible region from 200 to 400 nm at various temperatures between 150 and 400 K. The values of the direct and indirect band gaps were calculated at various temperatures. These values were lower for higher temperatures. An absorption peak was observed at a wavelength around of 285 nm at temperatures lower than 300 K. Such insight into the dielectric and optical responses of PET track membranes in a wide temperature range is particularly important when this material is used as a matrix for the semiconductor structure in the development of optoelectronic or microfluid devices.

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Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax

et al. 2017

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The effect of gamma irradiation on the thermal behavior of dielectric properties of linear low-density/carbon black semiconductive composites

Cited by 6 publications

References 20 publications

Investigation of the Electrical Properties of Polymer/Carbon Composites Exposed to Joule Heating and Heat Treatment

Investigation of the Electrical Properties of Polymer/Carbon Composites Exposed to Joule Heating and Heat Treatment

Dielectric and optical properties of a poly(ethylene terephthalate) membrane in the temperature interval 150–400 K

Properties and thermo-switch behaviour of LDPE mixed with carbon black, zinc metal and paraffin wax

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