Poly(propylene oxide) (PPO) and the utilized solvents were acquired from Sigma Aldrich (now Merck), St. Louis, MO, USA. The chemical structure of the polymer is displayed in Scheme 1 .
The polymer solutions were prepared by dissolving 2.5 g of PPO powder in 100 mL of each of the following solvents, acquired from Sigma Aldrich (now Merck): benzonitrile (anhydrous, ≥99%), carbon disulfide (anhydrous, ≥99%), chloroform (anhydrous, ≥99%, contained 0.5–1.0% ethanol as a stabilizer), ethyl acetate (anhydrous, ≥99.8%), and p-dioxane (anhydrous, ≥99.8%). The pH of the polymer solutions did not vary intentionally during experiments, and the small variations were caused by the combination of PPO (pH = 4) with the selected solvents having pH values comprised between 4 and 7.
The polymer solutions were prepared by dissolving 2.5 g of PPO powder in 100 mL of each of the following solvents, acquired from Sigma Aldrich (now Merck): benzonitrile (anhydrous, ≥99%), carbon disulfide (anhydrous, ≥99%), chloroform (anhydrous, ≥99%, contained 0.5–1.0% ethanol as a stabilizer), ethyl acetate (anhydrous, ≥99.8%), and p-dioxane (anhydrous, ≥99.8%). The pH of the polymer solutions did not vary intentionally during experiments, and the small variations were caused by the combination of PPO (pH = 4) with the selected solvents having pH values comprised between 4 and 7.
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