As expected, the copolymerization with a second diamine, Aj, different than Ai, offers the same control over the regioregularity of the resulting polymer. The inset of Figure represents a magnification of the signal n', associated to the methine proton of the primary hydroxyl groups, The SEC chromatograms of the alternated and the random polymers are represented in Figure . The corresponding number average molar masses, Mn, SEC, are reported in Table . Again MNMR ~ 5×Mn, SEC, reflecting the underestimation of the molar masses in SEC chromatography.