The thermodynamic behavior, the morphology, and the molecular structure of systems prepared from exposure to liquid solvent (cis- and trans-decalin) of solid isotactic polystyrene samples at different temperatures (4-40 degreesC) are reported. No significant differences are detected when comparison is made with solution-cast samples prepared by a rapid cooling at the same temperatures. This shows again that the formation of these systems is independent of the path followed: varying concentration at constant temperature (solvent-exposed) or varying temperature at constant concentration (solution cast) produces the same effects.