Cyclic poly(aryl ether) oligomers

摘要

Cyclic poly(aryl ether) oligomers and mixtures thereof, and methods for the preparation thereof in a highly dilute reaction medium under reaction conditions favorable for ring closure at low degrees of polymerization. These oligomers are represented by the general formula <IMAGE> where each Y is divalent oxygen or divalent sulfur, each Ar is an aromatic diradical which comprises one or more C6 to C20 arylene groups and has at least one electron withdrawing group attached to an aromatic ring, and n is an integer from 1 to about 20 with the proviso that for integer values of n equal to 1 or 2 all linkages between independent aromatic rings comprise at least one atom.