Synthesis of PBAT-based oligomers (oligoPBAT-diol) OligoPBAT-diol was synthesized according to a solvent-and catalyst-free procedure (Figure ). Briefly, PBAT was melted and dissolved in BDO, used as a reactive solvent for the transesterification step adapted from previous works to obtain PBAT-based oligomers with hydroxyl (OH) ending molecules . After reaction and distillation of the major part of remaining BDO, oligoPBAT-diol was precipitated into cold ethanol, filtered, washed, vacuumdried and finally recovered as a white powder. The corresponding detailed procedure can be found in the SI.