Synthesis and Properties of Poly(Ether Ether Ketone Ketone)/Poly(Ether Sulfone Ether Ketone Ketone) Copolymers with Pendant Cyano Groups

Poly(ether ether ketone ketone)/poly(ether sulfone ether ketone ketone) copolymers with pendant cyano groups were synthesized by the Friedel-Crafts electrophilic substitution reaction of terephthaloyl chloride(TPC) with varying mole proportions of 2,6-diphenoxybenzonitrile(DPOBN) and 4,4′diphenoxydiphenyl-sulfone(DPODPS) using 1,2-dichloroethane(DCE) as solvent and N-methyl-2-pyrrolidone(NMP) as Lewis base in the presence of anhydrous AlCl_3.The polymers were characterized by IR,DSC,TGA and WAXD techniques.The results showed that the glass transition temperatures of the polymers ranged from 162 ℃ to 195 ℃ and the thermal decomposition temperatures of the polymers from 501 ℃ to 545 ℃;the polymers were amorphous and could be dissolved or swelled in NMP,DMF,DMSO,DCE,THF,CHCl_3 solvents.