Summary
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.
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Received: 7 December 1998/Revised version: 21 January 1999/Accepted: 29 January 1999
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Qi, Y., Chen, T. & Xu, J. Synthesis of cyclic precursors of poly(ether ether ketone). Polymer Bulletin 42, 245–249 (1999). https://doi.org/10.1007/s002890050459
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DOI: https://doi.org/10.1007/s002890050459