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
An, B; Zhang, W; Han, J; Wang, Y; Ni, L
Journal of Solution Chemistry 45(12): 1811-1825
ISSN/ISBN: 0095-9782 DOI: 10.1007/s10953-016-0534-2
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.