A new class of aromatic poly‐ether‐aroyl‐oxadiazoles. II. Studies on the cyclization reaction, infrared, structural, and morphological characterization

Poly‐ether‐aroyl‐oxadiazoles (PEODZ) of general formula: chemical structure image are reported. Thermal cyclization of the starting polyhydrazides, infrared, thermal, and structural characterization are discussed as function of the number of methylene spacers in the range 2–12. It is found that the position of melting is strongly dependent upon the number ofCH2, and that moldable polyoxadiazoles are obtained at × values > 7. The spherulitic nature of PEODZ is clearly revealed by thermal‐optical microscopy which, together with isothermal crystallizations at the differential scanning calorimeter, gives a close insight into the crystalline organization of such polymers.