226. Microtextural characterization of natural and heat-treated coals
β Scribed by J.N. Rouzaud; A. Oberlin
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 128 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
Coals of increasing rank contain a mixture of solid fragments and particles which look liquid. The first ones are a fractions insoluble in boiling anthracene-oil, the others are /I fractions (soluble in anthracene-oil but insoluble in toluene). The content of fi fraction passes by a maximum as softening during pyrolysis. This fraction is responsible for coal behavior in heat-treatment.
π SIMILAR VOLUMES
Applying the theories for resistivity of the amorphous and granular materials, the temperature dependence of the electrical resistivity of coals, heat treated at different temperatures, has been successfully explained in terms of structural parameters obtained by X-ray measurements.
Studies of the hardness (Shore and Brinell), the mechanical strength (compression and transverse), the dynamic Young's Modulus, the thermal conductivity and the thermal expansion coefficient for coalcarbon compact as a function of heat treatment temperature (HTT) were carried out. Coal-carbon compac
## SYNOPSIS Two kinds of water-insoluble PVA-MA hydrogel films were prepared from PVA-MA, an esterification product of poly(viny1 alcohol) and maleic anhydride, by heat treatment and a crosslinking reaction, respectively. Both films changed their dimensions upon environmental pH changes. The cross