Etude du prépolymère époxyde par chromatographie et 1H NMR à 350 mhz, 2

The epoxy resins (TGMDA) obtained from 4,4′‐methylenedianilic (2) and 1‐chloro‐2,3‐epoxypropane (epichlorohydrin) were found to consist of oligomers with large distribution of molecular weights and functionalities. The structure of the main components separated by preparative gel permeation chromatography and by high pressure liquid chromatography (HPLC) was studied by 1H NMR. The best separation was obtained by HPLC on a preparected TGMDA with tert‐butyl isocyanate at 60°C. For the impurities, as found with DGEBA prepolymers, we identified primary and secondary alcohol groups on chain ends but also secondary amino groups inside the oligomer chains.