*3.2. Mechanism between MA, DCP, PBS, PBAT, and TPRH/TPS*

Figure 2 presents the mechanism between MA, DCP, PBS, PBAT, and TPRH/TPS. The reaction between PBS and PBAT was formed via the hydrolysis reaction and forming the C-O bond. DCP decomposed at the initial step to form primary radicals. These primary radicals attracted the hydrogen atom from the PBS/PBAT backbone and yielded PBS/PBAT radicals at the initiation step. The propagation step shows the maleic anhydride (MA) molecules grafted onto the PBS/PBAT radicals to form PBS/PBAT-MA radicals and followed by termination reaction. The PBS/PBAT-MA radicals might undergo hydrogen transfer from TPS and TPRH and form the final product. The termination step showed the reaction between PBS/PBAT-g-MA with TPS and TPRH.
