Polymer Bulletin, Vol.42, No.3, 245-249, 1999
Synthesis of cyclic precursors of poly(ether ether ketone)
A novel synthetic route to cyclic PEEK precursors is described. These new cyclic oligomers have been prepared from hydroquinone and N-phenyl(4,4＇-difluorodiphenyl) ketimine. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis unambiguously confirmed the cyclic nature.