Cryoscopy in polymer solutions: scaling laws and Kauzmann paradox

We discuss the melting behavior of the solvent's crystals in linear flexibl e polymer solutions. Taking into account the Daoud- Jannink (DJ) diagram, a nd the limit Kauzmann temperature TK, one gives the cryoscopic laws describ ing the solid-liquid transition of the solvent, in the different concentrat ion- temperature DJ domains. Finally one explains why, for thermodynamic re asons, below a critical concentration phi (K),the solvent can not crystalli ze. In these systems, the cion crystallizable amount of solvent depends of the theta temperature characterizing the polymer-solvent interaction, the K auzmann temperature and the ratio between the melting enthalpy and the melt ing temperature of the pure solvent.