Recent advances in the chemistry of aromatic cyclic oligomers

Development of an efficient and convenient means for preparation of aromatic cyclic oligomeric carbonates has made these materials available for a wide range of polymerization and processing studies. Building on the workbased on bisphenol A cyclics, recent efforts have concentrated on the preparation of new cyclics which afford polymers with properties substantially different from bisphenol A polycarbonate. Cyclic systems have been developed which lead to polycarbonates with improved solvent resistance, either through cross‐linking or via crystallization. Polycarbonates with both high or low glass transition temperatures have also been achieved.