Phase separation, stability limit, and other solution properties

4 Phase separation, stability limit, and other solution properties 

Let us now find some important physical quantities of the mixture. 

The osmotic pressure jt of the A component is essentially the chemical potential of the B component with the opposite sign. It is given by 

In apolymer solution in which the B component is a low-molecular weight nonassociative solvent (mb = 1 and 5b ( ) = 0), this definition reduces to the osmotic pressure in the conventional meaning. 

If we expand this pressure in powers of the concentration with mb = 1, we have the virial series 

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