Handbook of Solvents - George Wypych - ChemTech - Ventech!

278 Ligia Gargallo and Deodato Radic
Figure 5.4.5. Variation of the preferential adsorption as a
function of solvent composition (Δ) PPh (Gargallo et al.,
1984): (�) PDMPh: (O) PDPPh. From Gargallo et al. 114
(Copyright by Springer Verlag, used with permission).
results 113 indicate that the size of the substituents
on the polymer ester group exerts
an influence on the specific interaction between
the methanol molecule and the carbonyl
of the ester. It has been shown that
the preferential adsorption of methanol is
completely hindered when the lateral
groups are bulky enough.
Several attempts have been made to
take into account the geometrical character
of the polymer segment and the solvent
molecule. None of them seems to give a
unique explanation for the experimental results
about the cosolvent effect.
The most important task in the field of
research on ternary systems polymer in binary
solvents is to examine the state of the
macromolecular chain in solution and the analysis of the changes in solubility and then in
composition involved in the total system itself.
The goal of this review was to present aspects of the preferential adsorption phenomena
of solvents and polymers with a focus on their thermodynamic aspects. The idea behind
this was to attract the attention of polymeric physico-chemists to this area, which is sufficiently
related to a lot of different effects. In fact, preferential adsorption occupies a special
place in the solubility of polymers in mixed solvents.
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