1. Objective

To make polymers suitable for use in aircraft structures, the Air Force Materials Laboratory in the USA realized as early as the 1950s that it was necessary to develop macromolecular compounds that would preserve their structural integrity and retain their properties over long periods at temperatures of the order of 300 C [1] . The use of intrinsically rigid elements such as aromatic rings and the insertion of heterocycles into the chain ensure thermal stability [2] . Heterocycles are formed by polycondensation, leading to the macromolecular formation of aromatic rings associated with imide groups, imidazoles, quinoxalines... A wide variety of heterocyclic polymers have been developed, but until 1970, most of them failed to reach industrial maturity. This failure...