Thermodynamic properties of some polymer solutions at elevated temperatures

The enthalpies of mixing at infinite dilution have been measured for the four systems polyisobutylene + benzene, +n-pentane, +n-hexane and +n-octane from room temperature up to the vicinity of the lower critical solution temperatures. The results are analyzed in terms of the statistical theories of polymer solutions due to Prigogine and to Flory. Both theories give a reasonable qualitative description of the experimental results.