Analysis and characterization of unusual ternary polymer miscibility in poly(ether diphenyl ether ketone), poly(ether ether ketone), and poly(ether imide)

A rape case of ternary polymer miscibility has been demanstrated in the mixture (in the glassy amorphous domains) comprising three polymers: polyetherimide (PEI), a new semicrystalline metal-linked poly(ether diphenyl ether ketone) (PEDEKm), and semicrystalline poly(ether ether ketone) (PEEK). The T???-composition relationship for the ternary miscible blend system was treated by extension of the conventional models. The narrow T-??? breadth also suggests that the scale of mixing was fine. The ternary blend exhibit no cloud point transition within the wide temperature range (50-400 degrees C) studied. The interactions between any pairs among the three polymers were estimated using the Flory-Huggins theory. The FTIR result gave further evidence that no significant specific interactions existed in ant of the three binary pairs. The results collectively supported thai no significant binary Delta(chi) existed in the ternary polymer blend, which is favorable for leading this rare ternary miscibility.