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A quaternary (liquid+liquid) equilibrium study was performed to focus attention on the interaction parameters between poly-N-vinylcaprolactam (PVCL) and poly-ethylene glycol (PEG) as well as between other species. At first, the new experimental data of (liquid+liquid) equilibria for aqueous two-phase systems containing PEG, KH 2 PO 4 , and PVCL at T=303.15K have been determined. Then...
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