Abstract: Polyaryletherketone copolymers of high molecular weight have been synthesized bypolycondensation of phenolphthalein(PPh), hydroquinone (HQ) and 4,4'-dichlorobenzophenone(DCBP) using K₂CO₃ as a catalyst and sulfolane as solvent.Both amorphous and crystallinecopolymers can be made depending on the molar ratio of PPh to HQ.The copolymers have preliminarily been characterized by IR, DSC and WAXD techniques.T_g of the copolymers were between 143℃(T_g of pure HQ-PEK) and 228℃(T_g of pure PPh-PEK), attd they incrsase monotonically as a function of PPh content in the copolymers.The copolymers increase have better solvent and heat resistance prorerties than pure PPh-PEK (PEK-C).

Key words: phenolphthalein, polyaryletherketone, copolymer, synthesis