The increased surface wettability due to the addition of PEG, leads to a concomitant enhancement of surface erosion and, consequently, higher biodegradability compared to PBS-DLS copolymers. Similar observation was reported for other materials, in which the addition of PEG had caused considerable change in hydrophilicity, such as PCL-PEG copolymers, resulting in acceleration of hydrolytic degradation, using lipase enzyme . These findings suggest a uniform surface degradation mechanism through erosion, which aligns with previous studies in the literature , .