Thermodynamics of polymer solutions. Part 3.—Polyisobutylene and cyclohexane
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 64, 2061-2065
- https://doi.org/10.1039/tf9686402061
Abstract
Activities and excess volumes for concentrated mixtures of polyisobutylene and cyclohexane have been determined at 25°C. The former yield χ 0.5; variations of χ with concentration, expressed as segment fractions, are small. The volume change on mixing is negative, amounting to ca. –0.14% of the total volume at φ2= 0.5. These results in conjunction with the previously determined enthalpy of mixing are rationally interrelated by theory; arbitrary assignment of X12 1.4 cal cm–3 suffices. This value of X12 denotes a very small difference for the interactions between neighbour pairs. The dependence of χ on concentration is overestimated by theory, but the magnitude of the large entropic contribution to χ is correctly predicted.Keywords
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