Question

does the blend of polystyrene and poly(vinyl methyl ether) exhibit an upper critical solution temperature or a lower critical solution temperature? What is the value? Is this common or unusual for polymer blends?

Answer 1

Blend of polystyrene and poly(vinyl methyl ether) exhibits lower critical solution temperture because these two polymer blends are miscible blends as they expected to exhibit same glass transition temperature which is used for the measurement of polymer blends.

The value of polystyrene and poly(vinyl methyl ether) blends are 40K below the lower critical solution temperature

and the upper critical solution temperature or a lower critical solution temperature is common for the polymer blends.