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Application of Flory-Huggins theory to ternary polymer-solvents equilibria: A case study

✍ Scribed by E. Favre; Q.T. Nguyen; R. Clement; J. Neel

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
649 KB
Volume
32
Category
Article
ISSN
0014-3057

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✦ Synopsis

The ternary equilibrium data of the following systems: benzene/heptane/NBR at 60Β°C (system l), heptane/isooctane/PE at 25Β°C (system 2), ethanol/water/CA at 20Β°C (system 3) and ethanol/water/ P(E-co-VAc) at 32Β°C (system 4), already reported in the literature, have been used and experimental results compared to predictions offered by the Flory-Huggins theory applied to ternary mixtures (one Polymer and two liquids), with constant interaction parameters and negligible elastic contribution. Polymer-solvent interaction parameters have been determined from swelling in pure liquid, while liquid-liquid interaction parameters have been estimated from liquid-vapour equilibrium data curve fitting. It is shown that the Flory-Huggins theory offers reasonable prediction in the case of apolar liquids in an elastomeric matrix (system I), while approximate isotherm patterns with significant discrepancies are obtained with apolar liquids in a thermoplastic (system 2). The equilibrium data of polar liquids in either homopolymer or copolymer (systems 3 and 4) can hardly be achieved by Flory-Huggins theory, even when a variable liquid-liquid interaction parameter is used. Implications in ternary diagram simulations and possible prediction improvements are discussed.

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