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The temperature curves of dc current on liquid unsaturated polyester (UP) resins diluted by various amounts of styrene exibit several straight-line segments. From this the activation energies, glass and liquid-like transition temperatures have been evaluated. The transitions have been conformed by thermally stimulated discharge (TSD) measurements. The current intensity and transitions have been varied...
Trichlorotrifluoroethane (C2Cl3F3) is a stable molecule up to a temperature of 700°C. Under internal arc stress C2Cl3F3 was decomposed and Phosgene and other products were produced. The amount of produced Phosgene depends on the fed in energy per unit of gas mass and the presence of Oxygen. At the ignition of an arc in liquid C2Cl3F3 a shock-wave with amplitudes of up to 1 MPa occurs dependent on...
Low frequency dielectric measurements (5 Hz–100 MHz) in parallel with Differential Scanning Calorimetry were used to study the behavior of a water-in-dodecane microemulsion as a function of increasing water content, C-mass fraction, in the interval 0.024≤C≤0.4, upon decreasing temperature from 20°C down to −190°C. The presence of “free” and “interfacial” water molecules was evidenced and a differentiation...
The dielectric, conductivity and ultrasonic measurements for p-azoxy anisole are done in its solution in benzene and carbon tetrachloride at room temperature. The dipole moment and relaxation time are computed using a new alternative method as suggested by Johri(1984) and compared with Gopala Krishna microwave method, Higasi and Guggenheim statical methods. Adiabatic compressibility, Rao number, Vanderwaals...
In this paper the temperature dependence of the static and the high frequency permittivities of some saturated fatty acids of the series CnH2nO2 in the liquid phase are reported. From such data information on the associating behaviour and on the structure of the liquids are deduced in the light of the Kirkwood-Fröhlich theory for polar fluids. A discussion is then made on the dependence of association...
Mineral paraffinic oils, now considered for replacement of the dwindling naphthenic oils used in transformers produce solid waxes at low temperatures which can have detrimental effects on the transformer life. Since the electrical and chemical properties of both kinds of oil are almost indentical it is very difficult to determine the presence of paraffins in a sample of transformer oil. Several techniques...
The results of an experimental investigation of electric induced motion in mineral oil between plane parallel copper electrodes are presented. Instability field and dissipation factor were measured under varying frequency, electrode spacing, temperature and voltage-stress conditions. The motions were observed by means of laser schlieren. It is shown that the field is in good agreement with theoretical...
Dielectric permittivity, ε′, and loss factor, ε″/ε′, of tert-butyl alcohol (TBA) have been measured in the temperature range from 282 K to 323 K and at spot frequencies 0.7,25,60 and 100 MHz in cooling and heating cycles. Refractive index and d.c. conductivity of the sample have also been measured. Both ε′ and ε″ exhibit a sharp transition at a temperature below its freezing temperature in the cooling...
Both a.c. and impulse breakdown voltages have been measured over a range of temperatures from 30 °C to 180 °C using lengths of commercial conductor insulated with cellulose or Nomex 410 tape and immersed in two low-flammability liquids, R-Temp and Envirotemp. The insulated conductors were tested either touching or with a 1 mm liquid gap between them. Impulse breakdown voltages for zero gap were found...
The effect, of conduction band formation on electron thermalization ranges bGP was determined from free ion yield measurements in coexisting vapors and liquids. Effects for spherelike (methane) and rodlike (ethane) molecules were compared. The density range was 0.14 ≲ d/dc ≲ 2.8. The density normalized range bGPd is inversely related to the energy loss cross section of epithermal (∼0.1–1 eV) electrons...
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