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The Cloud Point Behavior and Liquid–Liquid Equilibrium of Poly(Ethylene Glycol)–Block-Poly(Propylene Glycol)–Block-Poly(Ethylene Glycol) with Five Salting-Out Salts (K2SO4, K2CO3, KCl, KNO3, KBr) at 283.15 K

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Abstract

The cloud points (CP) of aqueous solutions of two triblock copolymers, poly(ethylene glycol)–block-poly(propylene glycol)–block-poly(ethylene glycol), L31 (M n  = 1100 g·mol−1) and L61 (M n  = 2100 g·mol−1) were determined in the absence and presence of five salting out salts (K2SO4, K2CO3, KCl, KNO3, KBr) at different concentrations, and the liquid–liquid equilibrium (LLE) data for L31/L61–K2SO4/K2CO3/KCl/KNO3/KBr ATPSs were measured at 283.15 K. The results show that the addition of these salts decreases the CP of aqueous copolymer solutions and the copolymer with the higher molecular weight has a lower CP. The order in which salts depress the CP is as follows: \( {\text{K}}_{2} {\text{SO}}_{4} > {\text{K}}_{2} {\text{CO}}_{3} > {\text{KCl}} > {\text{KNO}}_{3} > {\text{KBr}} \). When the concentration of salt is the same, the anion order to depress the CP is as follows: \( {\text{SO}}_{4}^{2 - } > {\text{CO}}_{3}^{2 - } \), \( {\text{Cl}}^{ - } > {\text{NO}}_{3}^{ - } > {\text{Br}}^{ - } \). The abilities of the salt and anion to induce phase separations are in accord with their ability to reduce the CP. The results also show that the copolymer with the higher molecular weight phase separates more easily.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 31470434, 21406090, 21407058 and 21576124), the Grants from the project of General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China (No. 2015IK139), Zhenjiang Social Development Project (SH2015014), and the Graduate Practice and Innovation Projects of the Higher Learning Institutes of Jiangsu Province in 2015 (SJLX15_0505).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China

    Baodong An, Wenli Zhang, Yun Wang & Liang Ni

  2. School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China

    Juan Han

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  1. Baodong An
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  2. Wenli Zhang
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Correspondence to Wenli Zhang.

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An, B., Zhang, W., Han, J. et al. The Cloud Point Behavior and Liquid–Liquid Equilibrium of Poly(Ethylene Glycol)–Block-Poly(Propylene Glycol)–Block-Poly(Ethylene Glycol) with Five Salting-Out Salts (K2SO4, K2CO3, KCl, KNO3, KBr) at 283.15 K. J Solution Chem 45, 1811–1825 (2016). https://doi.org/10.1007/s10953-016-0534-2

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