Ternary interaction parameters in n-hexane/butanone (MEK)/poly(dimethylsiloxane) (PDMS) and n-heptane/MEK/PDMS systems

Second virial coefficients, A 2, intrinsic viscosities, [η], and solvation preferential coefficients, γ, for the ternary systems n-hexane, HEX, (1)/butanone, MEK, (2)/poly(dimethylsiloxane), PDMS, (3) and n-heptane, HEP, (1)/MEK (2)/PDMS (3) have been determined at 20.0°. Binary interaction paramete...

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Bibliographic Details
Published in:European polymer journal 1984, Vol.20 (5), p.447-453
Main Authors: Campos, A., Celda, B., Tejero, R., Figueruelo, J.E.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical modifications
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
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Summary:Second virial coefficients, A 2, intrinsic viscosities, [η], and solvation preferential coefficients, γ, for the ternary systems n-hexane, HEX, (1)/butanone, MEK, (2)/poly(dimethylsiloxane), PDMS, (3) and n-heptane, HEP, (1)/MEK (2)/PDMS (3) have been determined at 20.0°. Binary interaction parameters, g 2, have also been measured by light scattering. Inversion in γ at u 2 ⋍ 0.15 in the HEX system and at u 2 ⋍ 0.22 in the HEP system takes place. The inversion points are accompanied by smooth maxima in A 2 and in [η]. Both systems show a weak cosolvent character. Theoretical γ's derived, according to Flory-Huggins and Flory-Prigogine-Patterson, are compared with experimental values. The evaluation of the ternary interaction potential, g T, and its dependence on system composition allow evaluation of the binary interaction potentials and their dependence on polymer concentration.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(84)90024-7