Abstract
ABSTRACTHerein the effect of additives on the cloud point of thermosensitive copolymer Poly (ethylene oxide)–Poly (propylene oxide)–Poly (ethylene oxide) (PEO–PPO–PEO, L61) was investigated, including NaCl, NaOH, NaBr, Na2CO3, Na3PO4, Na2SO4, Na2HPO4, ZnSO4, FeSO4 and MnSO4 at different concentrations. It was found that the cloud point of L61 was lowered by adding the electrolytes and decreased linearly with increasing electrolytes concentration. In these systems, the addition of polyvalent anions resulted in a more pronounced salting-out effect than monovalent anions. A depression in the cloud point of L61 in the presence of multivalent electrolytes was observed in a trend of > >Cl−. Meanwhile, the ability of divalent anion lower cloud point evaluated by Gibbs free energy was appropriated, and the order as follows: > > . The capacity of divalent cation to reduce the cloud point followed the order Zn2+>Fe2+>Mn2+.
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