Phase separation in non‐solvent/dimethylformamide/polyethersulphone and non‐solvent/dimethylformamide/polysulphone systems

The cloud point curves for the ternary solutions non‐solvent/dimethyl‐formamide/polyethersulphone and non‐solvent/dimethylformamide/polysul‐phone were determined by a titration technique, at 303 K. In both systems the following order of increasing non‐solvent content at the cloud point was obtained: water < methanol < ethanol < 1‐propanol < acetone < carbon tetrachloride. For each non‐solvent the cloud point curve for the PES system occurred at higher non‐solvent concentrations than for the corresponding PSN system.