US EPA

8703627 

Journal Article 

Upper and Lower Critical Solution Temperatures in Polystyrene Solutions 

Saeki, S; Kuwahara, N; Konno, S; Kaneko, M 

1973 

1 

Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 

6 

2 

246-250 

English 

10.1021/ma60032a020 

Upper and lower critical solution temperatures have been determined for solutions of polystyrene in cyclohexane and methylcyclohexane and lower critical solution temperatures for the polystyrene–toluene system over the molecular weight range of Mw × 10–4 = 3.7 to ~270. The Patterson–Delmas theory of corresponding states, based on the Prigogine theory, has been applied to the polystyrene solutions and found to afford semiquantitatively good prediction of the molecular weight dependence of their critical temperatures. Polystyrene solution in methylcyclohexane displays a smaller miscibility region than that of the polystyrene–cyclohexane system, as indicated by the relative positions of their upper and lower critical solution temperatures. The entropy parameter ψ1 and Flory temperature θ obtained from lower critical solution temperatures for the polystyrene-toluene system are – 1.92 and 277°, respectively. 1973, American Chemical Society. All rights reserved.