Liquid–liquid equilibrium data were obtained for aqueous two-phase system (ATPS) composed of [poly(ethylene oxide) (PEO1500), poly(propylene oxide) (PPO425), poly(ethylene oxide)₁₁–poly(propylene oxide)₁₇–poly(ethylene oxide)₁₁ (L35), or poly(propylene oxide)₈–poly(ethylene oxide)₂₂–poly(propylene oxide)₈ (10R5)] + ammonium thiosulfate + water, at 283.2, 298.2, and 313.2 K. The consistencies of the all tie-line experimental compositions were improved by applying the Othmer–Tobias and Bancroft equations, resulting in linear correlation coefficients (R²) ≥ 0.95. For all the ATPS, an increase in the temperature resulted in increases in the biphasic region and the tie-line slope, indicating that the phase separation process was entropically driven. Among the macromolecules studied, PPO425 produced the largest biphasic region, due to its greater hydrophobicity, followed by L35 ≈ 10R5 > PEO1500.

中文翻译：

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大分子+硫代硫酸铵+水三元体系在283.2、298.2和313.2 K时的液-液相平衡数据

获得了由[聚环氧乙烷（PEO1500），聚环氧丙烷（PPO425），聚环氧乙烷_11-聚环氧丙烷₁₇ ]组成的水两相系统（ATPS）的液-液平衡数据。–聚环氧乙烷₁₁（L35）或聚环氧丙烷_{8 –}聚环氧乙烷_{22 –}聚环氧丙烷₈（10R5）] +硫代硫酸铵+水，温度分别为283.2、298.2和313.2 K 。通过应用Othmer-Tobias和Bancroft方程提高了所有联系线实验成分的一致性，从而得到了线性相关系数（R ²）≥0.95。对于所有ATPS，温度升高导致双相区域和联络线斜率升高，这表明相分离过程是由熵驱动的。在所研究的大分子中，PPO425由于具有更大的疏水性而产生了最大的双相区，其次是L35≈10R5> PEO1500。