Polymer solutions coordinates of the demixtion critical point

2 Polymer solutions coordinates of the demixtion critical point 

We have already noted an essential feature of polymer solutions the coordinates (p0, Tc of the critical demixtion point are functions of the equivalent Brownian area S of the polymers. Let us recall here a few observed results. 

Let 7y be the Flory temperature. The interval TF — Te decreases when the equivalent Brownian area S of the polymers increases. For the polystyrene-cyclohexane system, we found a relation [see (16.2.7)] which can be written in 

In a similar way, for the polystyrene-cyclohexane system, the interaction b is given by [see (16.1.1)] 

This result is in agreement with the predictions of the simple-tree approximation (and of the Flory-Huggins theory) which gives 

---