Abstract
A general method for the preparation of pyridazine-containing aromatic poly(ether ketone)s has been developed. Polymerization is based on a ketone-activated nucleophilic halo displacement in pyridazine containing bis(4-fluorobenzoyl) moieties by phenoxides. 3,6-Bis(4-fluorobenzoyl-4'-phenoxy-4"-phenoxy)pyridazine was prepared by reaction of 4-fluorobenzoyl chloride with 3,6-bis(4-phenoxyphenoxy)pyrfdazine in dichloromethane in the presence of aluminum chloride. Reaction 3,6-bis(4-fluorobenzoyl-(4-phenoxy-4phenoxy)pyridazine with diphenols in an aprotic solvent in the presence of potassium carbonate gave a series of aromatic poly(ether ketone pyridazine)s. Films of the aromatic poly(ether ketone pyrdazine)s displayed good thermal stability, flexibility, and T. values ranging from 159 to 198 'C. The dielectric constants of the films were characterized as a function of relative humidity (RH).
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