“…The study of conformational properties (i.e., hydrodynamic radius) of polymers in supercritical fluids has been an area of active research. Some commonly used supercritical fluids (ScF) for polymers include carbon dioxide (CO 2 ),1–4 ethane (C2),1, 3, 5, 6 and propane (C3)1, 3, 5, 7–9 due to their relatively low‐critical temperatures and pressures. The solubility of polystyrene (PS) in these three supercritical fluids is well known 1, 5, 10.…”