QUANTUM SEMIEMPIRICAL STUDY OF THE REACTIVITY OF MONOMERS IN THE SYNTHESIS OF AROMATIC POLYAMIDES AND POLYIMIDES

The amidation and imidation reactions have been studied by quantum sem iempirical methods, determining the influence of different types of su bstituents on the geometries and electronic parameters of diamines, ei ther unsilylated or silylated, diacyl chlorides and dianhydrides. It w as confirmed that the energy of the frontier orbitals, E-LUMO in the e lectrophiles and E-HOMO in the nucleophiles, is the main parameter tha t controls the reactivity of the different monomers.