FEATURES OF PHASE-TRANSITIONS IN VARIOUS REGIONS OF PHASE-DIAGRAM OF THE POLY(GAMMA-BENZYL-L-GLUTAMATE)-DIMETHYLFORMAMIDE SYSTEM

he features of phase transitions in the poly(gamma-benzyl-L-glutamate) -dimethylformamide system are considered in the entire range of concen trations, with a special attention to the transitions involving the me lting or formation of gels having crystallosolvate junctions. Some fea tures of the phase diagrams observed in the region of low polymer conc entrations are explained on the basis of analysis of the crystallosolv ate-liquid crystal (CS-LC) and CS-isotropic solution liquidus curves. A structure-related interpretation of the features of phase transition s in the region of high polymer concentrations is proposed proceeding from the notion of various structural defects in crystallosolvates and of the ''limiting'' liquid-crystalline phase. This approach also qual itatively explains the experimental data obtained by the method of dif ferential scanning calorimetry.