Four random poly(ether ether ketone ketone) copolymers (PEEKK-X/PEEKK-A)s were prepared via nucleophilic aromatic substitution polycondensation of 9

9-bis(4-hydroxyphenyl)xanthene (BHPX)

1

4-bis(4-fluorobenzoyl)benzene and bisphenol A(BPA).The PEEKK-X/PEEKK-A copolymers were characterized by FTIR

DSC

TGA and WAXD

etc. The results showed that the copolymers having number-average molecular weights (Mn’s) in the range of 39500~41600

the polydispersity index ranging from 1.95 to 2.05 were all amorphous and readily soluble in common organic solvents such as N-methyl-pyrrolidone(NMP)

N

N-dimethylacetamide(DMAc)

THF and CHCl3 at room temperature.These polymers showed relatively high glass transition temperatures in the range of 185~218℃

almost no weight loss up to 430℃ in nitrogen or air atmosphere

decomposition temperatures at 5% weight loss ranging from 490℃ to 511℃

and 480℃ to 505℃ in nitrogen and air

respectively

and char yields at 700℃ in nitrogen higher than 40%.Transparent

flexible and tough films of these polymers cast from their solutions exhibited tensile strengths ranging from 58 MPa to 75 MPa

Young’s moduli from 1.95 GPa to 2.70 GPa

and elongations at break from 8% to 13%.The novel PEEKK-X/PEEKK-A copolymers derived from the bisphenol monomers of BHPX and BPA with molar ratio in the range of 60/40 to 50/50 might serve as new candidates for processable high-performance polymeric materials with potential applications in high technology fields.