COPOLYMER BLENDS OF PHENYLSULPHONYLATED POLY(2,6-DIMETHYL-1,4-PHENYLENE OXIDE) AND POLY(P-FLUOROSTYRENE-CO-P(O)-CHLOROSTYRENE)

Miscibility in random copolymers of p-fluorostyrene-co-p(o)-chlorostyr ene (poly(p-FSt-cop(o)-ClSt)) with partially sulphonylated poly(2,6-di methyl-1,4-phenylene oxide) (SPPO) has been studied by differential sc anning calorimetry (DSC). It was found that miscibility predominantly depends on the degree of sulphonylation of SPPO copolymers. Copolymers of pFSt with pClSt exhibit miscibility with SPPO with a higher degree of sulphonylation than the copolymers containing oClSt. Upon annealin g to temperatures of 523 and 573 K, only small changes in the miscibil ity regime were observed. Using the mean-field theory approach, the mi scibility behaviour was analysed in terms of the individual segmental interaction parameters.