Modelisation de la reaction chimique de durcissement d'un systeme epoxy

Chemical, as well as spectroscopical methods, were used to try to describe, as quantitatively as possible, the different kinds of chemical bonds constituting the network of a cured epoxy matrix, the tgmda/ DDS system. The chemical approach consisted, on the one hand, in synthesizing model compounds; on the other hand, model reactions from diepoxy and amino compounds were followed by chemical, chromatographical and spectroscopical analysis, in order to correlate structure of the products with reactivity of the starting molecules. Spectroscopical method, which was found most useful for this resin system, is solid state ¹³C CP/MAS NMR spectroscopy. As the spectra were not directly interpretable, because consisting largely of broad, bad-resolved peaks, the aliphatic carbon region was decomposed into elementary lines. Structural assignments of the latter were made by using the solution state ¹³C NMR data of model compounds. On account of the anticipated mechanisms, 85 % of the aliphatic carbons could be identified and quantified.