. 1 H and 13 C NMR spectra of PBA-DLA were recorded using a Bruker spectrometer (800 MHz, 10 s relaxation delay, 128 scans for 1 H-NMR and 700 MHz, 10 s relaxation delay, 5120 scans for 13 C-NMR). The samples were dissolved in CDCl3, and tetramethylsilane (TMS) was used as the internal reference. The NMR results obtained in this study were analyzed using MestreNova 2009 and Origin 2021 software.