A novel synthesis and characterization of phenylacetylene end‐capped poly(aryl ether sulfone) and poly(aryl ether ketone) oligomers

A series of controlled molecular weight poly(aryl ether sulfone) oligomers with benzophenone moieties at the chain termini were prepared. The two carbonyl groups at the chain ends were converted to ethynyl groups by using trimethylsilyldiazomethane/BuLi in tetrahydrofuran. Reactions of 4,4′‐isopropylidenediphenol with 4,4′‐difluorobenzophenone and 4‐fluorophenylphenylacetylene as the end‐capping reagent in N,N‐dimelthylacetamide afforded the desired poly(aryl ether ketone) oligomers Both sulfone and ketone containing oligomeric polyethers undergo crosslinking reactions at elevated temperatures.