NOVEL POLY(ARYLENE ETHER KETONE KETONE)S SYNTHESIZED BY FRIEDEL-CRAFTS ACYLATION

A series of novel poly(arylene ether ketone ketone)s were prepared fro m two novel oligomers and three different diacid chlorides via Friedel -Crafts polymerization. The oligomers 2,6-bis(4-phenoxybenzoyl)naphtha lene and 5-tert-butyl-1,3-bis(4-phenoxybenzoyl)benzene were synthesize d by Friedel-Crafts acylation of diphenyl ether with 2,6-naphthalenedi carbonyl dichloride and 5-tert-butylisophthaloyl dichloride, respectiv ely, in the presence of AlCl3 as catalyst. Friedel-Crafts polymerizati on of either of these two novel oligomers with tert-butylisophthaloyl dichloride, isophthaloyl dichloride or 1,6-hexanedioyl dichloride gave six novel PEKK's, having T-g's in the range of 135-180 degrees C, but only the naphthalene-based PEKKs displayed T-m's between 130 and 345 degrees C. PEKK's containing the 5-tert-butylisophthaloyl group are so luble in polar solvents such as N,N-dimethylacetamide, N-methyl-2-pyrr olidone, N,N-dimethylformamide, THF, chloroform etc. Polymer PA(1), wh ich has a fully unsubstituted aromatic chain structure, is insoluble i n common organic solvents and, moreover, shows polymorphism. Intrinsic viscosities and adhesion behavior of soluble PEKKs were also determin ed.