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

✍ Scribed by A. Campos; B. Celda; R. Tejero; J.E. Figueruelo

• Book ID: 103070695
• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 483 KB
• Volume: 20
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(84)90024-7

✦ Synopsis

Second virial coefficients, A 2, intrinsic viscosities, [r/], and solvation preferential coefficients, 2, 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, g12, have also been measured by light scattering. Inversion in 2 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, and in [r/]. Both systems show a weak cosolvent character. Theoretical 2's derived, according to F[ory-Huggins and Flory-Prigogine-Patterson, are compared with experimental values. The evaluation of the ternary interaction potential, gr, and its dependence on system composition allow evaluation of the binary interaction potentials and their dependence on polymer concentration.