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 mix ture (in the glassy amorphous domains) comprising three polymers: polyether imide (PEI), a new semicrystalline metal-linked poly(ether diphenyl ether k etone) (PEDEKm), and semicrystalline poly(ether ether ketone) (PEEK). The T ???-composition relationship for the ternary miscible blend system was trea ted by extension of the conventional models. The narrow T-??? breadth also suggests that the scale of mixing was fine. The ternary blend exhibit no cl oud point transition within the wide temperature range (50-400 degrees C) s tudied. The interactions between any pairs among the three polymers were es timated using the Flory-Huggins theory. The FTIR result gave further eviden ce that no significant specific interactions existed in ant of the three bi nary pairs. The results collectively supported thai no significant binary D elta(chi) existed in the ternary polymer blend, which is favorable for lead ing this rare ternary miscibility.