Sa. Vshivkov et al., NEW-TYPE OF PHASE COEXISTENCE CURVES FOR A SYSTEM CRYSTALLIZABLE POLYMER-SOLVENT, Vysokomolekularnye soedinenia. Seria A, 35(3), 1993, pp. 20000159-20000160
An unusual form of the curve of coexistence of phases was observed for
solutions of crystalline polystyrene. A concentration range was found
where the coexistence curve is horizontal, i.e., the transition tempe
rature is independent of concentration.