A monomer of tetrachloroterephthaloyl chloride (TCTPC) was prepared by the chlorination of terephthaloyl chloride catalyzed by ferric chloride at 175～180℃ for 10 h

and confirmed by FTIR

MS and elemental analysis. A soluble polychloro substituted poly(aryletherketoneketone) (C-PEKK) was prepared by low temperature solution electrophilic Friedel-Crafts reaction of TCTPC and diphenyl ether (DPE) in 1

2-dichloroethane in the presence of AlCl3 and N-methyl-2-pyrrolidinone (NMP)．Effects of the molar ratio of monomers and the amounts of AlCl3 and NMP on the polycondensatlon were investigated．Some propersites of the polymer was characterized by FT-IR

DSC

TGA and WAXD

etc. The results shown that the glass transition temperature(270℃) of the polymer is higher than that of pure PEEK and PEKK

and the polymer was noncrystalline. The polymer was soluble in common organic solvents such as DMF

DMSO

NMP

CHCl3 and THF at room temperature and showed excellent thermal stability at temperature over 500℃ in air

high char yields of 61％ in nitrogen and 54％ in air at 700℃.