Abstract
Aromatic poly(phenylene ether ether ketone)s were prepared by the direct self-polycondensation of 4-(4′-phenoxyphenoxy)benzoic acids using phosphorus pentoxide/methane-sulfonic aicd (PPMA) as a condensing agent and solvent. The polycondensations proceeded smoothly at 60–100°C and produced poly(phenylene ether ether ketone)s with inherent viscosities up to 1.5 dl g−1. The synthesis of poly(phenylene ether ketone)s by the direct self-polycondensation of ortho substituted phenoxybenzoic acids in PPMA was also carried out, where the polycondensation of 4-(o-methoxyphenoxy)benzoic acid produced high molecular weight poly(phenylene ether ketone) at 80°C for 24 h. The thermogravimetry of the aromatic poly(ether ketone)s showed 10% weight loss both in air and in nitrogen around 500°C.
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