Poly(aryl ether ether ketone ketone)(PEEKK) is a kind important high-performance polymers due to their excellent thermal stability a nd other outstanding properties similar to PEEK and PEKK.However,the PEEKK’s ins olubility in common solutions and high melt point restrict its processing and ap plications.In this paper,a series of random copolymers composed of poly(aryl eth er ether ketone ketone)(PEEKK)/poly(aryl ether ketone ether ketone ketone) cont a ining bis(o-metheyl) moiety(DM-PEKEKK) were prepared by low temperatur e so lution polycondensation of 4,4′-bis(2,6-dimethylphenoxy)diphenylketone (o -M 2DPOBP),1,4-dipheoxylbenzene(DPB) and terephthaloyl chlorde(TPC) in 1,2 -dichloroethane with the presence of AlCl 3 and DMF. The copolymers were chara cterized by FT-IR,DSC,WAXD,TGA,etc.The results show that glass transitio n te mperature increases greatly with the increasing of the ratio of o-M 2DPOBP /DPB,while melting temperature and crystallinity of copolymers decrease.The solu bility of the copolymers is improved greatly,while the copolymers still exhibit excellent thermostability.
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 AlCl 3 and N-methyl-2-pyrrolidinone(NMP).Effects of the molar ratio of monomers and the amounts of AlCl 3 and NMP on the polycondensation 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,CHCl 3 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℃.
