Ternary Diagrams of Poly(vinylidene fluoride) and Poly[(vinylidene fluoride)‐co‐hexafluoropropene] in Propylene Carbonate and Dimethyl Sulfoxide

Experiments on the thermoreversible gelation of a ternary system composed of poly(vinylidene fluoride) (PVDF) and poly[(vinylidene fluoride)‐co‐hexafluoropropene] (P(VDF‐co‐HFP)) in propylene carbonate (PC) or DMSO solutions are carried out and the resulting ternary diagrams are plotted for various systems. The results show that the gelation occurs at relatively low concentrations. The miscibility area of the ternary diagram is larger with DMSO than with PC. In addition, the concentration at the gelation point increases with increasing temperature. The gelation line is almost independent of the molecular structure of PVDF in PC but varies in DMSO. This variation of the miscibility is essentially connected to the carboxylic functions on the PVDF chain.