For comparison purposes, random copolymers were also synthesized according to a single step protocol: 1 eq. of the vicinal dicarbonate (EDC or TDC) is mixed with 0.5 eq. of amine A1 and 0.5 eq. of amine A2, in DMSO. The reaction is carried out at 25 °C for 4h and 80 °C for 20h. The random copolymers are noted poly(XA1-ran-XA2), where X = E or T. The crude polymers were fully characterized according to the same methods ( 1 H NMR, SEC, DSC and TGA) and the resulting data are listed in Table .