Abstract
Phase diagrams of systems containing high-carbon-number n-alkanes (up to n-pentatriacontane) and polystyrene were studied in the temperature range from 190 to 250°C. Experimental data obtained for low-carbon-number alkanes by inverse gas chromatography were extrapolated taking advantage of the linear relationships between ln V g 0 (specific retention volume at 0°C) and the inverse of the temperature and between ln V g 0 and the number of carbon atoms for homologous series. The resulting activity coefficients and interaction parameters were typical of systems with a poor compatibility. The Gibbs free energy of mixing (Δ G m) for polystyrene-alkane systems was calculated, with the Flory-Huggins χ parameter assumed to be independent of the composition. The Δ G m vs. alkane volume fraction curves exhibited a shape corresponding to solution instability at low concentrations of both components. On this basis the phase diagram of the system polystyrene-alkanes was calculated.
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