ELECTRICAL AND DIELECTRIC PROPERTIES OF RUBBER

2016 ◽  
Vol 89 (1) ◽  
pp. 32-53 ◽  
Author(s):  
C. M. Roland
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Carbon Black ◽  
Conductivity Measurements ◽  
Dielectric Measurements ◽  
Segmental Dynamics ◽  
Nonlinear Dielectric ◽  
Secondary Relaxations ◽  
Electrical And Dielectric Properties ◽  
Conductive Fillers

ABSTRACT This review describes electrical and dielectric measurements of rubbery polymers. The interest in the electrical properties is primarily due to the strong effect of conductive fillers, the obvious example being carbon black. Conductivity measurements can be used to probe dispersion and the connectivity of filler particles, both of which exert a significant influence on the mechanical behavior. Dielectric relaxation spectra are used to study the dynamics, including the local segmental dynamics and secondary relaxations, and for certain polymers the global chain modes. A recent development in the application of nonlinear dielectric spectroscopy is briefly discussed.

Carbon Black in Rubber Insulating Compounds

1930 ◽  
Vol 3 (4) ◽  
pp. 733-742
Author(s):  
W. B. Wiegand ◽  
C. R. Boggs
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Carbon Black ◽  
Power Factor ◽  
Dielectric Strength ◽  
Electrical Insulation ◽  
Rubber Content ◽  
Beneficial Effects ◽  
The Wire ◽  
Tear Resistance

Abstract 1—It has been shown that, in conformity with published behavior of other conducting substances (metallic sols, etc.), carbon black may be incorporated in a dielectric such as rubber without detracting from its insulating or dielectric properties. Published results to the contrary were in error, probably because the material was added in excessive amounts. 2—In addition to this effect, it has been shown that the well-known ability of carbon black to adsorb water and dissolved electrolytes endows carbon black???rubber insulating compounds of various types with improved dielectric strength, resistivity, and power factor, the specific inductive capacity remaining substantially unchanged. In some cases this improvement may exceed 50 per cent. 3—The prevailing opinion that carbon black is injurious to rubber insulating compounds which are to be used next to the wire, or which in general are expected to serve as electrical insulation, has been shown to be erroneous, provided the proper proportions are employed. 4—These results would seem to render advisable the rewriting of many specifications dealing with rubber insulating compounds, and thus make it possible to apply the well-known beneficial effects of carbon black compounding—improved toughness, density, wearing resistance, imperviousness to light, tear resistance, etc.—to the electrical insulation field, from which it has hitherto been barred. 5—Although it is strongly recommended that the proper dosage of carbon black (which must be of suitable quality and thoroughly dry) be redetermined in each case, the writers' results would indicate that up to 10 per cent of carbon black on the crude rubber (plus the rubber content of any reclaimed rubber present) will effect the desired improvement in electrical properties.

scholarly journals Dielectric and electrical properties of annealed ZnS thin films. The appearance of the OLPT conduction mechanism in chalcogenides

RSC Advances ◽  
2020 ◽  
Vol 10 (16) ◽  
pp. 9549-9562 ◽  
Author(s):  
J. Koaib ◽  
N. Bouguila ◽  
H. Abassi ◽  
N. Moutia ◽  
M. Kraini ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Conduction Mechanism ◽  
Annealing Temperature ◽  
Electrical And Dielectric Properties

The annealing temperature (Ta) dependence of the structural, morphological, electrical and dielectric properties of ZnS thin films was investigated.

scholarly journals Thermal/Electrical Properties and Texture of Carbon Black PC Polymer Composites near the Electrical Percolation Threshold

2021 ◽  
Vol 5 (8) ◽  
pp. 212
Author(s):  
Valentina Brunella ◽  
Beatrice Gaia Rossatto ◽  
Chiara Mastropasqua ◽  
Federico Cesano ◽  
Domenica Scarano
Keyword(s):  
Electrical Properties ◽  
Carbon Black ◽  
Percolation Threshold ◽  
Textural Properties ◽  
Thermoplastic Polymer ◽  
Conductivity Measurements ◽  
Scanning Calorimetry ◽  
Electrical Percolation ◽  
Electrical Percolation Threshold ◽  
Dc Electrical Properties

Polycarbonate (PC), a thermoplastic polymer with excellent properties, is used in many advanced technological applications. When PC is blended with other polymers or additives, new properties, such as electrical properties, can be available. In this study, carbon black (CB) was melt-compounded with PC to produce polymer compounds with compositions (10–16 wt.% of CB), which are close to or above the electrical percolation threshold (13.5–14 wt.% of CB). Effects due to nanofiller dispersion/aggregation in the polymer matrix, together with phase composition, glass transition temperature, morphology and textural properties, were studied by using thermal analysis methods (thermogravimetry and differential scanning calorimetry) and scanning electron microscopy. The DC electrical properties of these materials were also investigated by means of electrical conductivity measurements and correlated with the “structure” of the CB, to better explain the behaviour of the composites close to the percolation threshold.

scholarly journals Water Content Control to Improve Space Charge Storage in a Cork Derivative

2012 ◽  
Vol 730-732 ◽  
pp. 395-400
Author(s):  
M. Carmo Lança ◽  
Inês Cunha ◽  
João Paulo Marques ◽  
Eugen R. Neagu ◽  
Luis Gil ◽  
...  
Keyword(s):  
High Temperature ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Thermal Treatment ◽  
Dielectric Relaxation ◽  
Discharge Current ◽  
Absorption Rate ◽  
Charge Storage ◽  
Dielectric Relaxation Spectroscopy ◽  
Electrical And Dielectric Properties

The influence of humidity content on the electrical and dielectric properties of a composite made from recycled TetraPak® containers and granulated cork was studied. The material components have been dried before preparation and after the composite was conditioned by keeping the samples in a dry environment (desiccator) or in an oven at high temperature (70°C in air). The differences observed in electrical properties (investigated by isothermal charge and discharge current measurement) and dielectric properties (measured using dielectric relaxation spectroscopy) show that the thermal treatment at high temperature is more efficient on removing water and slows down the re-absorption rate.

Dielectric Measurements in the Study of Carbon Black and Zinc Oxide Dispersion in Rubber

1939 ◽  
Vol 12 (2) ◽  
pp. 317-331
Author(s):  
A. R. Kemp ◽  
D. B. Herrmann
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
Zinc Oxide ◽  
Dielectric Properties ◽  
Carbon Black ◽  
Water Soluble ◽  
Oxide Dispersion ◽  
Dielectric Measurements ◽  
Thermal Decomposition Process ◽  
Rubber Compounds

Abstract The dielectric constant, power factor, conductivity and d.c. resistivity of rubber compounds containing various types and quantities of zinc oxide and carbon pigments have been measured. It has been shown that the dielectric properties of rubber compounds having high loadings of zinc oxide depend on the particle size and purity of the zinc oxide used. The French process oxides with the smallest particle size were found superior to other grades. Water-soluble impurities in zinc oxide are shown to have a deleterious effect on dielectric properties, especially in the presence of moisture. The effect on dielectric properties of adding carbon black to a rubber compound has been shown to be dependent on the type and amount of black added, and on the nature of its dispersion in the rubber. The dielectric properties of rubber compounds containing “soft” black made by the thermal decomposition process are shown to be distinctly superior to, and widely different from, those of the same compounds containing equal amounts of channel process black. The general conclusion has been reached that the smaller the particle size and the better the dispersion of carbon pigments in the rubber, the greater will be the increase in the dielectric constant and conductivity, and the greater will be the decrease in resistivity.

Carbon Black Selective Dispersion and Electrical Properties of Epoxy Resin/Polystyrene/Carbon Black Ternary Composites

2012 ◽  
Vol 548 ◽  
pp. 94-98 ◽  
Author(s):  
Chuan Guo Ma ◽  
Ming Liu
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Carbon Black ◽  
Polymer Blends ◽  
Epoxy Resin ◽  
Phase Structure ◽  
Continuous Phase ◽  
Phase Structures ◽  
Thermosetting Polymer ◽  
Conductive Properties

Carbon black (CB) selective dispersion and conductive properties of immiscible thermoplastic/thermosetting polymer blends consisting of polystyrene (PS) and epoxy resin (EP) were investigated in this paper. The results showed that CB particles are preferentially localized in EP phase in PS/EP blends. The blend with 10 pbw (parts by weight) PS presented an EP continuous phase structure, and both blends with 20 pbw and 30 pbw developed into a bi-continuous phase structure. The selective dispersion of CB particles was explained by thermodynamic parameters. The phase structures of blends have important influences on both conductive and dielectric properties. The blends with 10 pbw PS has a very low percolation threshold nearly 0.25wt%.

scholarly journals Electrical and dielectric properties of carbon black filled co-continuous two-phase polymer blends

1999 ◽  
Vol 32 (13) ◽  
pp. 1517-1525 ◽  
Author(s):  
C Calberg ◽  
S Blacher ◽  
F Gubbels ◽  
F Brouers ◽  
R Deltour ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Carbon Black ◽  
Polymer Blends ◽  
Two Phase ◽  
Electrical And Dielectric Properties

ELECTRICAL AND DIELECTRIC PROPERTIES OF C7H12N2[H2PO4]2 ⋅ 1/2H2O

2012 ◽  
Vol 02 (04) ◽  
pp. 1230014 ◽  
Author(s):  
R. ELWEJ ◽  
A. OUESLATI ◽  
F. HLEL
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Grain Boundary ◽  
Complex Impedance ◽  
Impedance Spectrum ◽  
Electrical Equivalent Circuit ◽  
Compound C ◽  
Wide Range ◽  
Electrical And Dielectric Properties ◽  
Nyquist Plots

The electrical and dielectric properties of the compound C7H12N2[H2PO4]2 ⋅ 1/2H2O were investigated by the complex impedance spectroscopy, over a wide range of frequencies and temperatures, 600 Hz–5 MHz and 303–408 K, respectively. Besides, a detailed analysis of the impedance spectrum suggested that the electrical properties of the material at several temperatures and the electrical equivalent circuit have been proposed to explain the impedance results. Concerning the Nyquist plots, they clearly showed the presence of bulk and grain boundary. As for the imaginary part of modulus at several temperatures, it shows double relaxation peaks, thus suggesting the presence of grains and grain boundary conductions in the sample.

Sign in / Sign up

Export Citation Format

Share Document