Well-defined telechelic-type aromatic polyamides having a secondary amino group and a phenyl ester moiety at each chain end were prepared by the chain-growth polycondensation of phenyl 4-(octylamino)benzoate (1) with initiator 2 (N-tert-butoxycarbonylated 1) followed by deprotection of the N-protecting group of the initiator unit. This polycondensation was applied to the synthesis of well-defined di- and triblock copolymers of aromatic polyamides and poly(tetrahydrofuran) (poly(THF)) by the reaction of the terminal secondary amino group of the polyamide with the living cationic propagating group of poly(THF).