EINSTEIN SPECIFIC-HEAT MODELING OF THE EFFECTS OF CHLOROBENZENE REFLUXING ON THE MACROMOLECULAR STRUCTURE OF PITTSBURGH NO.-8 COAL

An interpretation of specific heat data for Pittsburgh No. 8 coal refl uxed in chlorobenzene for varying time in terms of a two-component Ein stein model is given. It is shown that in the initial stages of reflux ing (up to 8 days) there is increased macromolecular association in th e bedding plane of the coal but that further refluxing leads to macrom olecular association perpendicular to the bedding plane. Second-order phase transitions in the coal are also observed, and the variation of Einstein temperatures below and above these transitions are discussed.