Temperature obtaining higher conductivity

If the temperature dependence of conductivity is known in a given solvent, an estimate of an unknown A0 at higher temperatures may be obtained which is much better than that measurable at lower temperatures with the help of the Walden rule ... 

Solid-state (topochemical) polymerization of cyclic disulfur dinitride to poly(sulfur nitride) (or polythiazyl), -fSN, occurs on standing at ambient temperature or higher [Banister and Gorrell, 1998 Labes et al., 1979 Ray, 1978]. Disulfur dinitride is obtained by sublimation of tetrasulfur tetranitride. Polythiazyl is a potentially useful material, since it behaves like a metal. It has an electrical conductivity at room temperature about the same order of magnitude as a metal like mercury and is a superconductor at 0.3°C. Polythiazyl also has high light reflectivity and good thermal conductivity. However, it is insoluble and infusible, which prevents its practical utilization. 

These are obtained by conducting the vapor of sul- same state by subjecting them to higher temperatures. ... 

In Fig. 8 we show a comparison of the thermal conductivity for liquid HMX obtained from our NEMD simulations with measured values for crystalline HMX [54] as well as values used in combustion models for HMX [55]. Despite being weak, the temperature dependence of the thermal conductivity of liquid HMX is not featureless. The thermal conductivity exhibits a sharp drop in the temperature interval from the melting point (550 K) up to 650 K. At higher temperatures the thermal conductivity exhibits almost no temperature dependence. The predicted value at 550 K is consistent with the HMX crystal data [54]. The thermal conductivity used in some combustion models [55] agrees to within about 25% with our NEMD predictions over the entire temperature interval. 

Different salt additions to the electrolyte improve its physicochemical properties melting temperature, electrical conductivity, density, interfacial tension, etc. The general trend is to use low melting electrolytes to obtain higher current efficiencies. 

After isothermal cure, temperature scans are conducted in order to measure the Tg after cure and Tg . However, due to thermal degradation, postcures can lead to lower glass transition temperatures than those obtained after cure. Thus, the determination of Tg , for high T, systems is a difficult problem. One approach is to establish a relationship between Tg and theoretical crosslink density for systems of lower Tgoc and similar chemical structure, and extrapolate to the system with higher crosslink density, thereby obtaining an estimate of Tg, ... 

The influence of temperature on syntheses conducted in the basic medium is not as clear as in the fluoride system. [Co(cp)2]-NON may crystallize in the temperature range of 140-180°C. Pure samples are routinely obtained in the temperature range of 140-160°C. At higher temperatures (160-180°C), [Co(cp)2]-ZSM-48 or [Co(cp)2]-DOH is usually found as by-products. It has not yet been possible to find conditions that reliably and reproducibly lead to pure ZSM-48. Temperatures at the level of decomposition of the cobalticinium cation in basic solution (175-180°C) and large autoclave volumes (50 ml instead of the usual 10 ml) seem to favour the formation of [Co(cp)2]-DOH. In this way, a pure cobalticinium-containing DOH compound can be obtained. This was not possible in the fluoride-mediated reaction (see above), which gave [Co(cp)2]F-DOH only as a byproduct in syntheses with [Co(cp)2]F-AST as the main product. 

Major results. Figure 14.7 shows that the resistivity of aluminum-filled PMMA changes abruptly. Smaller volumes of filler contribute a little to resistivity but, after certain threshold value of filler concentration, further additions have little contribution. A similar relationship was obtained for nickel powder the only difference is in the final value of resistivity, which was lower for nickel due to its higher conductivity. The same conclusions can be obtained from conductivity deteiminations of epoxy resins filled with copper and nickel. Figure 14.8 shows the effect of temperature on the electric conductivity of butyl rubber filled with different grades of carbon black. In both cases, conductivity decreases with temperature, but lamp black is substantially more sensitive to temperature changes. Even more pronounced changes with temperature were detected for the dielectric loss factor and dissipation factor for mineral filled epoxy." ... 

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