Polymers 2011, 3(1), 587-601; doi:10.3390/polym3010587
Article

Phase Diagrams of the Aqueous Two-Phase Systems of Poly(ethylene glycol)/Sodium Polyacrylate/Salts

1 Department of Biochemistry and Structural Biology, University of Lund, P.O. Box 124, SE-221 00 Lund, Sweden 2 Department of Physics, IBILCE/UNESP, São Paulo State University, Rua Cristovão Colombo, 2265, SP, CEP 15054-000, São Jose do Rio Preto, Brazil 3 Department of Biochemical and Pharmaceutical Technology, University of São Paulo, Av. Prof. Lineu Prestes, 580—Bloco 16, Cidade Universitaria, CEP 05508-000, São Paulo, Brazil
* Author to whom correspondence should be addressed.
Received: 15 February 2011; Accepted: 7 March 2011 / Published: 9 March 2011
(This article belongs to the Special Issue Polyelectrolytes)
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Abstract: Aqueous two-phase systems consisting of polyethylene glycol (PEG), sodium polyacrylate (NaPAA), and a salt have been studied. The effects of the polymer size, salt type (NaCl, Na2SO4, sodium adipate and sodium azelate) and salt concentrations on the position of the binodal curve were investigated. The investigated PEG molecules had a molar mass of 2,000 to 8,000 g/mol, while that of NaPAA was 8,000 g/mol. Experimental phase diagrams, and tie lines and calculated phase diagrams, based on Flory-Huggins theory of polymer solutions are presented. Due to strong enthalpic and entropic balancing forces, the hydrophobicity of the added salt has a strong influence on the position of the binodal, which could be reproduced by model calculations.
Keywords: poly(ethylene glycol); sodium polyacrylate; ATPS; Flory-Huggins theory; phase diagram; hydrophobic ions

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MDPI and ACS Style

Johansson, H.-O.; Feitosa, E.; Junior, A.P. Phase Diagrams of the Aqueous Two-Phase Systems of Poly(ethylene glycol)/Sodium Polyacrylate/Salts. Polymers 2011, 3, 587-601.

AMA Style

Johansson H-O, Feitosa E, Junior AP. Phase Diagrams of the Aqueous Two-Phase Systems of Poly(ethylene glycol)/Sodium Polyacrylate/Salts. Polymers. 2011; 3(1):587-601.

Chicago/Turabian Style

Johansson, Hans-Olof; Feitosa, Eloi; Junior, Adalberto Pessoa. 2011. "Phase Diagrams of the Aqueous Two-Phase Systems of Poly(ethylene glycol)/Sodium Polyacrylate/Salts." Polymers 3, no. 1: 587-601.

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