RECENT ADVANCES IN THE SYNTHESES OF AROMA TIC POLYKETONES

Aromatic polyketone is one of the most highly performed super engineer ing plastics. With the progress of clarification of the exact feature of structure and thermal behavior of the polymers, a lot of novel arom atic polyketones have appeared and various synthetic approaches were u ndertaken in these years. The recent advances of polyketones are revie wed from synthetic interests. (1) New synthetic reactions, introductio n and removal of tentative auxiliary groups in order to maintain the f lexibility of polymer chain during chain elongation reaction, and uses of transition metals as a highly effective catalyst were developed fo r achievement of high molecular-weight polymer skeleton. (2) Fundament al structural perturbation was undertaken by introduction of crankshaf t rings and additional conjugated moieties. (3) Introduction of side g roups and their chemical transformation were undertaken to perform new structures and advanced properties. (4) Fine syntheses and reactions of designed oligomers and polymer precursors both for model studies an d reactive oligo/polyketones were also investigated. The reports in 19 99 and later were mainly surveyed.