Volume 64, 1968

Thermodynamics of polymer solutions. Part 3.—Polyisobutylene and cyclohexane

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.

Article information

Article type
Paper

Trans. Faraday Soc., 1968,64, 2061-2065

Thermodynamics of polymer solutions. Part 3.—Polyisobutylene and cyclohexane

B. E. Eichinger and P. J. Flory, Trans. Faraday Soc., 1968, 64, 2061 DOI: 10.1039/TF9686402061

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