An approach to the study of phase separation in ternary aqueous systems

1. Simple thermodynamic expressions are used to describe the properties of uncharged binary and ternary polymer solutions, in particular the sedimentation equilibrium of binary systems and the osmotic pressures and ;incompatible' phase separations of ternary systems. 2. Sedimentation-equilibriu...

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Bibliographic Details
Published in:Biochemical journal 1968-10, Vol.109 (4), p.569-576
Main Authors: Edmond, E, Ogston, A G
Format: Article
Language:English
Subjects:
Dextrans
Glycols
Macromolecular Substances
Mathematics
Osmotic Pressure
Polyethylenes
Polymers
Thermodynamics
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Summary:1. Simple thermodynamic expressions are used to describe the properties of uncharged binary and ternary polymer solutions, in particular the sedimentation equilibrium of binary systems and the osmotic pressures and ;incompatible' phase separations of ternary systems. 2. Sedimentation-equilibrium experiments were performed on four samples of dextran and two of polyethylene glycol. The critical points of the phase diagrams were determined for the mixed solutions of polyethylene glycol-dextran-water and of polyethylene glycol-bovine serum albumin-0.2m-sodium chloride solution. Osmotic pressures were measured on a single-phase mixed solution of a polyethylene glycol and a dextran. By use of the simple thermodynamic expressions consistent values of second virial and interaction coefficients for the materials used were obtained from these experiments. 3. The interpretation of the values of the second virial and interaction coefficients, on the basis of three models of molecular interaction, is discussed.
ISSN:0264-6021
0306-3283
1470-8728
DOI:10.1042/bj1090569