Absolute prediction of upper and lower critical solution temperatures in polymer solutions from corresponding states theory: a semi-empirical approach
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 72, 1675-1684
- https://doi.org/10.1039/f19767201675
Abstract
Application of the corresponding states theory to phase equilibria in polymer solutions as formulated by both Flory and Patterson has been shown to provide only a qualitative description of the systems studied. A more quantitative agreement between theory and experiment can be obtained if the solvent temperature reduction parameter T☆ 1 is selected using a semi-empirical method which is embodied in the equation T☆ 1/K =–17 491 + 74.774 Tc–61.085 × 10–3T2 c where Tc is the solvent critical temperature. This modified approach leads to an absolute prediction of lower critical solution temperatures from measurements of only upper critical solution temperatures, and vice versa, although the latter is less accurate. The limitations of the method are discussed and alternative procedures for data analysis are examined, none of which appears to be an improvement.Keywords
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