Synthesis of high‐molecular‐weight poly(amide‐ester)s by direct polycondensation with diphenyl chlorophosphate

High molecular weight aromatic poly(amide‐ester)s were prepared by the direct polycondensation reactions between aromatic dicarboxylic acids and aminophenols under mild conditions in pyridine. The condensing agents examined in this study were diphenyl chlorophosphate (DPCP), DPCP/LiCl, and DPCP/DMF. Addition time of the aminophenols, depending on their nucleophilicities, affected the ηinh values and monomer sequence of the resulting polymer. Their thermal properties were studied in terms of the sequences in the polymer backbones.