MISCIBILITY-IMMISCIBILITY BEHAVIOR IN BLENDS OF PHENYLSULFONYLATED POLY(2,6-DIMETHYL-1,4-PHENYLENE OXIDE) AND POLY[STYRENE-CO-ORTHO(PARA)-CHLOROSTYRENE]

Miscibility in blends of random copolymers of poly[styrene-co-ortho(pa ra)chlorostyrene] with partially sulfonylated poly(2,6-dimethyl-1,4-ph enylene oxide) (SPPO) has been studied. Evidence from DSC measurements shows the window of miscibility is influenced by both, the chlorine a tom position on the benzene ring and the degree of sulfonylation of SP PO. Copolymers containing para-chlorostyrene exhibit miscibility windo w with SPPO of much higher degree of sulfonylation than the correspond ing copolymers of styrene with ortho-chlorostyrene. Good agreement was obtained between the miscibility-immiscibility boundaries obtained ex perimentally and by those calculated in terms of the individual segmen tal interaction parameters using a mean-field approach. (C) 1997 Elsev ier Science B.V.