Heats of mixing of polymer + solvent systems and corresponding states theories

Abstract

Heats of mixing to infinite dilution of polymer have been obtained between 30°C and the solvent boiling point for the following sets of systems: polyisobutylene (PIB)+ n-alkanes, polydimethylsiloxane (PDMS)+ n-alkanes and PDMS + dimethylsiloxane oligomers. The corresponding states theory and the recent Flory theory can give a qualitative, but not quantitative, interpretation of the results. The corresponding states principle for polymer solutions is apparently not obeyed by PIB + n-alkanes.