ABSTRACT
When two low molecular weight solutes are present in the same solution, i.e., in a common solvent, it is rare for the solution to break up spontaneously into two phases. However, when two solutions of different polymers in a common solvent are mixed, it is often found that two phases are formed, in organic (Dobry and Boyer-Kawenoki, 1947) as well as in aqueous media (Albertsson, 1986).
