The SEC chromatogram of the two polymers are very similar (see Fig. ): there is a main polymer peak and two small peaks at longer elution times marked with the black arrows. The peak at 55 min is DLA and the other at ~ 58 minutes is probably another oligomer from the synthesis (See SI Fig. ). PBS-DLS_S possesses lower Mn values compared to PBA-DLA_B (14,400 vs. 23,100 g/mol, respectively), which is in accordance with the Mn values calculated from 1 H NMR. Nevertheless, PBA-DLA_S has a higher Mw (70,300 g/mol) compared to that of PBA-DLA_B (50,800 g/mol), whereas its dispersity is much higher as well, with a value of 4.88 compared to 2.20 (see Table ). These alterations in Đ values may be attributed to the differences in the copolymer's microstructure and block arrangements, which result from the synthesis conditions and CAL-B selectivity. (see Table ). where Fx is the normalized integral value from 13 C NMR (x = BDO-DA-DLD,BDO-side; BDO-DA-DLD,DLD-side; BDO-DA-BDO; DLD-DA-DLD). The results calculated for each copolymer are presented in Table .