Pressure dependence of the Flory-Huggins interaction parameter in polymer blends: a SANS study and a comparison to the Flory-Orwoll-Vrij equation of state
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Abstract
The pressure dependence of the Flory-Huggins interaction parameter of two binary polymer blends was investigated by small-angle scattering of neutrons (SANS). We studied deuteropolystyrene/poly(vinyl methyl ether) (d-PS/PVME) and deuteropolystyrene/poly(phenylmethylsiloxane) (d-PS/PPMS) exhibiting lower and upper critical solution temperatures, respectively. It turned out that in the investigated pressure range between 1 and 1200 bar the enthalpic contribution of the Flory-Huggins parameter is practically independent of pressure. On the other hand, the absolute value of the entropic contribution, which is related to the free volume of the blend, decreases with pressure. Furthermore, pVT data of the d-PS/PPMS blend and of its components were measured. From the fits of these data with the Flory-Orwoll-Vrij (FOV) equation of state, the Flory-Huggins parameter was derived and compared with the SANS data. The comparison with the pressure dependence for the entropic contribution is unsatisfactory. The enthalpic contribution is almost pressure independent, as observed in the SANS data.
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