Abstract
The glass-transition temperature (Tg) of pyridine-soluble extracts obtained from Upper Freeport (UPF) coal was investigated. Previous studies have suggested that such a transition, if it exists, might occur at high temperatures and is probably masked by other transition processes. In this study, we used differential scanning calorimetry (DSC) experiments to calculate that the glass transition of the UPF coal extract occurs at ∼194 °C. This Tg value was obtained using an extrapolation of observed Tg values of miscible blends of the coal extract and poly(4-vinylpyridine) (P4VPy). UPF extract/P4VPy blends were prepared as a series that had a UPF extract content of 10−85 wt %. DSC thermograms of all blends exhibited a single Tg value at a temperature higher than that of pure P4VPy. The Tg values of the blends were dependent on the composition of the coal extract. Using the Kwei equation, which describes the relationship between blend composition and Tg, the Tg value of the coal extract was calculated.
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