Answer to Question #73630 in Physical Chemistry for ATIQ

Question

Using suitable diagram,discuss the mutual solubilities of components of the following liquid pairs which have

(1) lower critical solution temperature,
(2) upper critical solution tempurature , and
(3) both upper and lower critical solution tempuratures

Answer 1

Phase behavior of polymer solutions is an important property associated with the development and development of most processes associated with polymers. Partially miscible polymer solutions often have two solubility limits, the upper critical temperature of the solution (UCST) and the lower critical temperature of the solution (LCST), which both depend on the molar mass and pressure. At temperatures below the LCST, the system is completely mixed in all proportions, whereas with partial liquid miscibility, the LCST occurs.
In the phase diagram of the components of the mixture, LCST is the total minimum of concave spinodal and binodal (or coexistence) curves. It generally depends on the pressure, increasing depending on the increased pressure.
On the phase diagram of the components of the mixture is the total maximum of concave spinodal and binodal (or coexistence) curves. in general depends on the pressure.
Phase separation is generally due to unfavorable energy; in particular, the interactions between the components contribute to a partial mixed state.