AbstractPoly(etheraroylhydrazide) is synthesized in the presence of PA6 by means of low‐temperature condensation polymerization of 4,4′‐dichloroformyl‐α,ω‐diphenoxydodecane with terephthaloyl dihydrazide (TDH) in order to prepare polyhydrazide/poly‐amide 6 (PEHZ12/PA6) blends. The thermal analysis of the blends by DSC seems to indicate that the two polymers are not interacting. Nevertheless, when the blends are subjected to an extraction process with formic acid in order to remove the PA6, the characterization of the residual PEHZ12 reveales that some interactions do occur between the constituent polymers, at least for selected compositions. Model experiments permit to hypothesize that the polymerization of PEHZ12 proceeds with a chemical interaction between amino end groups of PA6 and growing